Difference between revisions of "Laser Cutter - Bumblebee"

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There are two of these. They have 3'x4' beds and 150 watt tubes. This one is named Bumblebee. It is identical to [[Laser Engraver - Wolverine|Wolverine]], except that whereas Bumblebee is yellow and black, Wolverine is yellow and very dark navy blue.
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{{Equipment
 
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|Name=Bumblebee
{{Equipment  
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|Zone=Laser Cutter
 
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|LooksLike=Laser_cutter_110212.jpeg
| Name = Bumblebee
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|Owner=i3Detroit
 
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|MakeModel=Jinan G. Weike / WKLaser LC1280
| Owner = Group-owned, purchased with funds collected from far and wide.
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|StorageLocation=West wall, you can't miss it.
 
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|Authorization Required=Yes
| StorageLocation = West wall, you can't miss it.
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|Status=Running
 
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|Value=$6000
| MakeModel = Jinan G. Weike / WKLaser LC1280
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|Documentation=The setup manual, [[File:OPERATIONAL_MANUAL_OF_MACHINE_xin_USB.pdf]] is worth reading, if only for a laugh.
 
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| Documentation =  
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The setup manual, [[File:OPERATIONAL_MANUAL_OF_MACHINE_xin_USB.pdf]] is worth reading, if only for a laugh.
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Inside the cutter, a [http://www.leetro.com/english/sale/20.html Leetro MPC6515 control board] coordinates the motors and laser firing. Its [http://www.leetro.com/english/down/MPC6515%20%20Manual.pdf documentation] is freely downloadable.
 
Inside the cutter, a [http://www.leetro.com/english/sale/20.html Leetro MPC6515 control board] coordinates the motors and laser firing. Its [http://www.leetro.com/english/down/MPC6515%20%20Manual.pdf documentation] is freely downloadable.
So much grief has arisen from the awful state of the documentation and software, that an entire [http://www.chineselasersupportforum.com/phpBB3/index.php Chinese laser support forum] has arisen for the hapless owners of these machines help each other.
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|Intro=This is one of the two nearly identical laser cutters in the space. They have 3'x4' beds and 150 watt tubes. This one is named Bumblebee becasue it is yellow and black, as compared to  [[Laser Engraver - Wolverine|Wolverine]], which is yellow and navy blue.
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|Rules=If you are not trained yourself, operation of the laser cutter must be done under the supervision of one of the trained operators. (A list can be found on the clip board in the zone) Trained operators are: Matt A., Roger S., Nate B., Terry W., Andrew M. and Devon T. See the section below about Damage Prevention.
  
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i3Detroit asks that users donate $0.25 per minute or $15 per hour that the beam is active. This is to replace consumables, especially the expensive bulb. There is a wooden donation box.
  
There is also [[Laser Cutting for Dummies]] on our wiki.
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===[[:Category:Laser Cutter#Materials | Approved Materials List]]===
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|Instructions=Get material that will fit on the bed of the laser cutter, which is 3'x4' (optimal cutting area 34" x 46"): 4 feet wide from left to right, and 3 feet long from the front to the back. Your piece must be able to fit on the bed itself, because the bed will lower to put the surface of your material in focus. However, in case anyone needs to know the whole interior of the bay for some reason: there is 51 inches of clearance between the two rails the gantry runs on (the same width as the machine's bay door). 51 inches is also the measurement from the front lip to the back wall of the machine, but the door itself takes up 3/4 of an inch of that.
  
| LooksLike =  
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===[[:Category:Laser Cutter#Using the laser cutters | General Instructions]]===
[[File:Laser_cutter_110212.jpeg|200px|thumb|left|alt text]]
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| Rules =
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=== Time-of-cut Checklist ===
 +
# Place material (square to edge of honeycomb).You can also run the head left / right and watch the red dot to see if it moves parallel to the edge of the material. Adjust as needed.
 +
# Cover inactive honeycomb area except an "intake" in front of the material. This directs smoke away from the gantry.
 +
# Turn on POWER STRIP on floor behind cutter. This should bring up the chiller <s>and air-assist pump</s>.
 +
# Gently pinch rubber hose from laser to chiller to trigger chiller alarm, verifying that it's awake.
 +
# Assure the exhaust is open on the back of the unit, right next to the chiller. Slide the door all the way open (to the left).
 +
# If the other machine is not in use, cover the vents at the back of the OTHER machine to increase the exhaust flow.
 +
# Make sure there is nothing obstructing the path of the laser head toward the right rear of the working surface!
 +
# Turn keyswitch to on, and wait for boot and home to complete.
 +
# With the D-pad, jog head over to center of material.
 +
# Check the lens for debris, and clean if necessary, especially if cutting something smokey like wood or MDF.
 +
# Press "Z" to enter the mode to raise or lower the bed. 
 +
# Set the focus with one of the acrylic [[Laser Cutter - Bumblebee#How to use the manual focus gauge|manual focus gauges]].
 +
# Press "Z" again to exit Z mode.
 +
# Open the quarter-turn valve on the wall (and the one feeding the compressor to the building) to supply air to the cut. The regulator should be set lower than 40psi.
 +
# Wave hand under head and verify that air-assist is blowing.
 +
# Download design from LaserCut software.
 +
# With the D-pad, jog head to start of cut.
 +
# Keep one hand over emergency-stop while using the "Test" button to check boundaries.
 +
# Turn on the exhaust fan (black switchbox on wall).
 +
# Lift the fire extinguisher and set it back down. This verifies that your muscle-memory knows where it is.
 +
# Press "Start".
 +
# DO NOT WALK AWAY. See http://www.thinkhaus.org/2011/04/03/lazzoring-is-serious-business/ for why.
 +
# When cutter finishes, observe elapsed time on LCD and put money into box.
 +
# Also, please remember to turn off the exhaust blower! The furnaces have to put back everything it removes.
  
Operation of the laser cutter must be done under the supervision of one of the trained operators. Trained operators are: Matt A, Roger S, Nate B, Terry W.
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[[File:Manual_Gauge_Use.jpg|thumb|300px|Example of a correctly focused setup]]
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=== How to use the manual focus gauge ===
 +
The manual focus gauges are in the laser cutter box. They are small L-shaped pieces of acrylic with "69mm For use with 63mm lens" engraved on them, corresponding to the 63mm focal length lenses currently installed in the laser cutters. To check the focus, place the gauge on the surface of the material you are cutting. The underside of the nib should rest against the top of the knurled fitting, as shown in the pictures to the right.  
  
i3Detroit asks that users donate $25 per hour that the beam is active. This is to replace consumables, especially the expensive bulb. There is a wooden donation box.  
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To re-cut the manual focus gauge, or to modify the file for a different lens, use the files found in [https://groups.google.com/forum/#!searchin/i3detroit/manual$20focus$20gauge/i3detroit/mmWnWmF4f0s/J_HSnur-ZTgJ this thread].
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|MaintenanceInfo==== How To Calibrate The Auto-Focus ===
 +
From time to time the auto-focus gets out of alignment for various reasons gradual or sudden. The depth-finding plunger is at the wrong height. One of two things have usually happened. A: the depth-finding plunger is at the wrong height on the lens cylinder; or B: the depth-finding plunger is at the wrong height in its (gold-anodized) holder.  Note: the telescoping of the assembly relative to the crossbar does NOT affect the focus, it affects the height of the honeycomb relative to the outside edge of the laser table when focused.
  
Do not cut or etch any plastics or other materials that contain chlorine or vinyl. A trace amount of chlorine, such as found in the glue in thin plywood or the resin of medium density fiberboard, is acceptable. Particle board has too much glue. You are responsible to know whether there is chlorine in your material before you try to cut it.
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To adjust the autofocus, use the plastic gauge (as shown above).  Adjust the position of the probe in its holder and the position of its holder on the black tube so that the top of honeycomb surface is approximately even with the surrounding edge, and there is enough of a gap between the holder and the top of the knurled ring to allow the gauge to fit between them.  The set screws that secure the probe bracket to the black tube should be below the bottom edge of the crossbeam that supports the laser head.
  
If you cut plexiglass, please be sure that it is acrylic and not polycarbonate. Look along the cut edge of the material, from the side. Polycarbonate is dark on this area; acrylic is light. Polycarbonate is one of the most dangerous materials you could try to laser. It instantly starts producing yellow, acrid, toxic fumes which will corrode your lungs, and the mechanisms and lens of the laser. When the lens clouds up with these fumes, it may reflect the laser back into the machine, which may melt the head and set the machine on fire. You may not be able to reach the fire extinguisher due to what is in your lungs. Both these outcomes will upset the community.  
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When you are done, make sure the nozzle is tight on the end of the black tube (thumbscrew on side is also tight) and the nut that controls telescoping of the lens assembly in the black tube is also secure.
  
*[http://www.buildlog.net/blog/2010/07/laser-cut-vinyl-record-bad-idea/ Cutting vinyl:&nbsp;bad idea!]
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=== Cleaning the laser head ===
*[http://www.cnczone.com/forums/laser_engraving_cutting_machines/56833-co2_laser_pvc_cutting.html Cutting PVC, Lexan, polycarbonates:&nbsp;bad idea!]
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If speed for CUT in 1/8" MDF falls below 20,then check the focus and have a trainer clean both mirrors and lens.
  
===Materials List===
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Trainers:
*Cut or etch: Acrylic, Delrin, Leather, Matte Board Chip Board (AKA architect modeling board), Melamine, Model Foam, Rubber, Wood (natural or veneer)
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* Use alcohol from the laser box and cotton ball.
*Etches but does not successfully cut: Glass, Coated Metals, Painted Metals, Ceramic, Tile, Marble
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* The convex lens side goes toward the laser.
*Cuts but does not take etching very well: Cloth, Paper, Mylar
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* The capture ring tool is in the white box.  
*Banned: Human flesh (yes, this has come up), Polycarbonate (Lexan etc.), PVC, Particle Board, any plastic if you don't know for sure it is Delrin or Acrylic
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* Use tweezers for removal of o-ring.
  
| Instructions =
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==== Power and Speed Rankings ====
 
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TW- I have noticed that the laser seems to lose power over time.  To better get a handle on this I am going to start running Cut Rankings.  Every time I use the laser, I will make a test of small squares on the 1/8 mdf, which is usually around as scrap,  for cutting at 100 power. They will be staggered at speeds of 5.10.15.20.  I will put the results and date.  If others could do this to we might start to see what we need to do.  If these settings are outdated, do your own test cuts as too low a speed produces a lot of smoke.
Get material that will fit on the bed of the laser cutter, which is 3'x4': 4 feet wide from left to right, and 3 feet long from the front to the back. Your piece must be able to fit on the bed itself, because the bed will lower to put the surface of your material in focus. However, in case anyone needs to know the whole interior of the bay for some reason: there is 51 inches of clearance between the two rails the gantry runs on (the same width as the machine's bay door). 51 inches is also the measurement from the front lip to the back wall of the machine, but the door itself takes up 3/4 of an inch of that.
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You will need access to vector graphics software to design your parts. So far, DXF files seem to work the least-bad of the various vector filetypes, so use them. LaserCut is good for putting finished art into the laser, but barely adequate for designing art.
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Materials which can be cut, can normally be cut up to about 3/16 of an inch. Some materials can be cut thicker with multiple passes. The thickest cut so far was of 1" thick acrylic. However, that required that it be cut from the opposite side, while flipped over and perfectly registered.
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When cutting parts on the laser, you will use the software to set the cutting speed and power. If we have cut the material you are using before, you can refer to the power and speed recommendations in this list. Otherwise - experiment! Bring some scrap material to do test cuts on until you find a cut you are satisfied with. After that, record your power and speed settings in the list:<br>
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===Power and Speed Rankings===
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TW- I have noticed that the laser seems to lose power over time.  To better get a handle on this I am going to start running Cut Rankings.  Every time I use the laser, I will make a test of small squares on the 1/8 mdf, which is usually around as scrap,  for cutting at 100 power. They will be staggered at speeds of 5.10.15.20.  I will put the results and date.  If others could do this to we might start to see what we need to do.
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* Cut means fall out / Popout means req'd push to release / No Cut means not seperable
 
* Cut means fall out / Popout means req'd push to release / No Cut means not seperable
Line 63: Line 78:
 
* 6/12/13  1/8 MDF  5 No CUT 10 NO CUT 15 NO CUT 20 NO CUT
 
* 6/12/13  1/8 MDF  5 No CUT 10 NO CUT 15 NO CUT 20 NO CUT
 
* 7/31/13  1/8 mdf  30 cut 33 cut 37 popout 40 popout
 
* 7/31/13  1/8 mdf  30 cut 33 cut 37 popout 40 popout
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* 8/6/13  1/8 mdf  20 cut 23 cut 27 cut 30 popout
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* 8/12/13 1/8 mdf  20 cut 23 cut 27 popout 30 nocut
 +
* 11/14/13  1/8 mdf  12cut 20 no cut
 +
* 11/14/13  1/8 mdf AFTER Cleaning    20 cut 25 cut 30 popout
  
 +
=== Sources for Replacement Parts ===
 +
Sector67 suggested http://www.ebay.com/usr/strut-your-stuff-here part #NP1190-150
  
 +
== Damage Prevention ==
  
 +
The most common way the laser can injure itself is colliding its plunger with something when it moves itself. Moving itself takes place during a job, when going to the logical origin that has been set to begin or end a job, or when homing to the upper right corner of the bed. Homing takes place when pressing the Datum button, or when the machine powers on, such as recovering from an emergency stop.
 +
If the plunger is mounted on the wrong side, it can collide with the machine frame during homing.
 +
The plunger can collide with material or with weights that are holding down material. During a job, sometimes a flexible material will lift off the bed through heat curling, or when cutting releases its pent-up spring energy. Continuing the job might cause the head to collide with the newly-emerged edge.
  
 +
Only use the auto-focus feature (z-datum) when plunger is over material. Otherwise, the plunger tip goes into the honeycomb without being pressed down, so the Z-motion doesn't stop itself, and crushes the lens head into the bed.
 +
Keep your hand over the emergency stop when auto-focusing.
 +
Everyone should practice hitting the emergency stop button. Pressing the emergency stop does not cause an emergency.
  
In general:
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Be very careful when removing the emergency stop, because it homes itself during every power-on. So, be sure the lens head is free. If the table is so high that the plunger is stuck in the honeycomb, open the lower doors of the laser, manually pull the belts on the screws so that the bed goes down. After this, this procedure will have to be reversed, measuring the distance from both sides of the bed to both sides of the gantry.
  
*Lower speeds allow for lower cutting power, which saves life on the laser tube.
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Coolant failure will destroy the laser, so each time the laser is used, squeeze the coolant tube to ensure that the alarm would go off.  
*Lower speeds cut a wider "kerf" (thickness of cut) through the material.
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*At higher speeds the cut is faster but requires higher power, which uses up the laser tube faster.
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*High power on wood and paper may cause some discoloration near the cuts (browning color from burned material).
+
  
Time-of-cut checklist:
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Be sure the exhaust is on, or the smoke gathering in the machine will damage the mechanics, the optics, and any nearby humans.  
# Place material (square to edge of honeycomb).
+
# Cover inactive honeycomb area except an "intake" in front of the material. This directs smoke away from the gantry.
+
# Turn on POWER STRIP on floor behind cutter. This should bring up the chiller and air-assist pump.
+
# Gently pinch rubber hose from laser to chiller, to trigger chiller alarm, verifying that it's awake.
+
# Assure the exhaust is open on the back of the unit, right next to the chiller. Slide the door all the way open (to the left).
+
# Turn keyswitch to on, and wait for boot and home to complete.
+
# With the D-pad, jog head over to start of cut.
+
# Press "Z" to enter the mode to raise or lower the bed.
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# Keep one hand over emergency-stop. Press "Datum" to auto-focus.
+
# Press "Z" again to exit Z mode.
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# Wave hand under head and verify that air-assist is blowing.
+
# Download design from LaserCut software.
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# Keep one hand over emergency-stop while using the "Test" button to check boundaries.
+
# Turn on the exhaust fan (black switchbox on wall).
+
# Lift the fire extinguisher and set it back down. This verifies that your muscle-memory knows where it is.
+
# Press "Start".
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# DO NOT WALK AWAY. See http://www.thinkhaus.org/2011/04/03/lazzoring-is-serious-business/ for why.
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# When cutter finishes, observe elapsed time on LCD and put money into box.
+
  
| OtherReferences =
+
Never laser-cut polycarbonate. It is highly flammable, and will produce toxic, highly corrosive smoke. Also do not cut plastics containing chlorine. Acrylic and delrin are currently the only known-safe plastics.
  
http://boxmaker.rahulbotics.com/ makes wonderful box patterns that you can put into the laser cutter.
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Before cutting something with an reflective surface, consult a user who is qualified for training or maintenance.
  
| MaintenanceInfo =
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If material catches on fire, hit the emergency stop, yell "fire", and use the fire extinguisher mounted to the front of the laser. Pull the pin, and spray carbon dioxide gas in a sweeping motion over the flames. It just dispenses carbon dioxide gas, not foam. This will do no damage. It's just loud.
 +
|FAQs=== TroubleShooting ==
  
How To Calibrate The Auto-Focus
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;Power won't come on, or shuts off during use.
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:Check the other items on the same line, such as the laser computer or the overhead light.  If they work, make sure the laser is still plugged in.  If the power is off to the whole line, the breaker box is located in the back corner in the wood shop. Flip it back on, and you should be good to go. (This is a known issue, and a more permanent fix is being discussed. Until then, apologies for ruined cuts)
  
From time to time the auto-focus gets out of alignment for various reasons gradual or sudden. The depth-finding plunger is at the wrong height. One of two things have usually happened. A. The lens cylinder has telescoped in itself, because the thumb screw that forms its lip was loosened, so calibration is done by pushing it back in place and re-tightening it; or, B. the depth-finding plunger is at the wrong height on the lens cylinder.
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;When running TEST I get a SOFT STOP message on screen and no test.
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:That usually means your cut runs off the laser table. Check your origin point on the file and where you have the laser head starting. Sometimes it means that Logical Origin is set to ON which places your cut off the table, no matter where you have manually set the laser head.
  
Regardless of which of those parts you are adjusting, use the huge acrylic brick which is on the shelves to measure your success and determine whether to go up or down. Put the block under the laser, do an auto-focus, and mash the "Laser" button for several seconds. The resulting hole will get thinner as it goes down, and then thicken out. This matches the shape of the beam. When the narrowest point of the hole (where the beam is most concentrated) is as close to the surface of the acrylic block as possible, this means the auto-focus plunger is at the correct height.
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;How can I turn off Logical Origin?
 +
:To Cancel Logical Origin use the keys on the Control Panel on the Laser and the Control Panel Display.
 +
:# Hit ESC 3 times.
 +
:# Hit the RETURN key (the one with an arrow that goes down and to the left). This should highlight the current file name.
 +
:# Hit RETURN again. This should pop you to the Logical Origin screen.
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:# Hit Right Arrow until the field Cancel Logical Origin YES is highlighted.
 +
:# Hit RETURN.
  
If you are not telescoping the actual lens cylinder itself, you will adjust the bracket that connects the auto-focus plunger to the lens cylinder. The bracket tightens on both ends, where it grips both those things. Ideally you would move the bracket where it grips the lens cylinder, not where it grips the plunger. But at the moment (April 2013), the clear plastic screws that tighten the bracket on the lens cylinder have their heads broken off from use. Roger is finding replacements for them. In the meantime, use the hex wrench in the white plastic tub to loosen the screw in the bracket which holds in the plunger.
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;My Test doesn't start where my laser head is and I have turned Logical Origin off
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*Make sure to check the IMMEDIATE box and save before Downloading AND turn off Logical Origin to allow the origin to be the manually set position of the laser head.
 +
*This could also mean your cut is running off the table, or close to the edge.  
  
Gently twist the plunger and pull up or down to adjust its elevation within the bracket. This twist will keep it from jumping up or down farther than you intend to. You'll probably want to just barely nudge it up or down. Then tighten the bracket and burn another focus hole. Repeat until the narrowest part of the hole is at the surface of the block.
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;It takes several minutes or infinite minutes to compile in LaserCut'''
 +
: I have had this happen with some (but not all) DXF files from OpenSCAD.  Open the dxf file in CorelDraw and then save it as dxf. It will "clean it up" and you compiles will now be very quick. I have no clue what is happening.
  
| ToDos =
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;When cutting 1/8mdf through it takes 100% and slower than 20 speed.
 +
:Check Focus.  If problem persists have trainer clean lens and mirrors.  DO NOT attempt cleaning if you are NOT a trainer.
  
;New cylinders to hold different lenses,   
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;When downloading file to laser cutter, no file appears in the DownLoad window or on the laser cutter
 +
: Your file is too big (some combination of actual size and complexity of design) to be transferred via the cord. You can download your design directly to the laser cutter via USB flash drive.
 +
# In the LaserCut Download window, choose "Export file" instead of "Download Current"
 +
# Find the files, a .mol and .txt and put them on a flash drive. They don't need to be the only files on the drive, but probably should be the only .mol file
 +
# Plug the flash drive into the laser cutter USB port. The port is located on the right side of the laser cutter, about 2 feet off the floor near the front edge. (someone should add a picture of the port location)
 +
# The file will be downloaded automatically- it might take a while to download, but it'll give you the progress as it goes.
 +
# Proceed as normal- you should see the name of the file in the menu as usual.
 +
 
 +
; The laser head moves through the design, but the laser doesn't fire!
 +
*Laser power setting in LaserCut should be above 17.
 +
*Check the air nozzle to make sure it isn't knocked out of whack and blocking the laser path. Check the mA meter just above the control panel. If it jumps up around 10-40 mA, then the laser supply is firing and just getting blocked
 +
*Make sure the chiller is on (safety interlock)
 +
*Make sure the door is all the way closed. The door interlock uses a small magnetic sensor on the front right bezel into which the door sits when closed. The magnetic sensor requires a small gap between it and the magnet. If the door requires re-alignment, TELL A TRAINER. DO not try to fix it yourself, just let someone know to re-align it so you don't make it worse.
 +
|ToDos=;New cylinders to hold different lenses,   
 
:...to make it easy and safe to change them without smudging or damage. Sector67 has indicated they may make some of these. (The existing cylinder has too narrow an opening for the lens that gives a long focal length. Its beam is so wide that it hits the lip and heats up the cylinder.)
 
:...to make it easy and safe to change them without smudging or damage. Sector67 has indicated they may make some of these. (The existing cylinder has too narrow an opening for the lens that gives a long focal length. Its beam is so wide that it hits the lip and heats up the cylinder.)
 
;Payment-measuring timer.
 
;Payment-measuring timer.
Line 127: Line 160:
 
;Aperture in the chassis, through which to thread the blue USB cable with a grommet.
 
;Aperture in the chassis, through which to thread the blue USB cable with a grommet.
 
:Instead, we discovered an exit under the machine and threaded it through that. [[user:Mattarnold|Matt Arnold]] used sugru on the side of the standing desk for a place to attach the end of the cable when unused.
 
:Instead, we discovered an exit under the machine and threaded it through that. [[user:Mattarnold|Matt Arnold]] used sugru on the side of the standing desk for a place to attach the end of the cable when unused.
 
+
|Equipment User={{Equipment User
| FAQs =
+
|UserName=Leonard
 
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|TrainedBy=Devon Truscott
A list of commonly asked questions
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|TrainedDate=2013/08/20
 
+
}}{{Equipment User
1)  If I have a jpeg file, how do I etch it on a piece of acryllic?
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|UserName=Matt Oehrlein
 
+
|TrainedBy=Devon Truscott
2)  If I set speed on LaserCut, what does the SPEED % mean on the display of the LaserCutter?
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|TrainedDate=2013/08/20
 
+
}}{{Equipment User
3)  I have a jpeg of a line drawing.  How can I cut a piece of acryllic using that line drawing?
+
|UserName=Kevin Flory
 
+
|TrainedBy=Devon Truscott
4)  Do I need training to use the LaserCutter?  If so, how do I get it?
+
|TrainedDate=2013/08/20
 
+
}}{{Equipment User
5)  Why do we have 2 LaserCutters?
+
|UserName=Jamie Burdeski
 
+
|TrainedBy=Devon Truscott
 
+
|TrainedDate=2013/08/20
== TroubleShooting ==
+
}}{{Equipment User
 
+
|UserName=Mike Fink
'''When running TEST I get a SOFT STOP message on screen and no test.'''
+
|TrainedBy=Devon Truscott
That usually means your cut runs off the laser table.  Check your origin point on the file and where you have the laser head starting.  Sometimes it means that Logical Origin is set to ON which places your cut off the table, no matter where you have manually set the laser head.
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|TrainedDate=2013/08/20
 
+
}}{{Equipment User
'''How can I turn off Logical Origin?'''
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|UserName=Marie-Therese Enga
To Cancel Logical Origin we will use the keys on the Control Panel on the Laser and the Control Panel Display.
+
|TrainedBy=Devon Truscott
 
+
|TrainedDate=2013/08/20
1)  Hit ESC 3 times.
+
}}{{Equipment User
 
+
|UserName=Eric Merrill
2)  Hit the RETURN key (the one with an arrow that goes down and to the left).  This should highlight the current file name.
+
|TrainedBy=Devon Truscott
 
+
|TrainedDate=2013/08/20
3)  Hit RETURN again.  This should pop you to the Logical Origin screen.
+
}}{{Equipment User
 
+
|UserName=Brian Wennberg
4)  Hit Right Arrow until the field Cancel Logical Origin YES is highlighted.
+
|TrainedBy=Devon Truscott
 
+
|TrainedDate=2013/08/20
5)  Hit RETURN.
+
}}{{Equipment User
 
+
|UserName=Ryan Ball
That should do it.
+
|TrainedBy=Devon Truscott
 
+
|TrainedDate=2013/08/20
 
+
}}{{Equipment User
'''My Test doesn't start where my laser head is and I have turned Logical Origin off'''
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|UserName=Jessica Rowland
Make sure and check the IMMEDIATE box and save before Downloading AND turn off Logical Origin to allow the origin to be the manually set position of the laser head.
+
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|Equipment Trainer={{Equipment Trainer
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|TrainerName=Devon Truscott
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|TrainerName=Matt Arnold
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}}{{Equipment Trainer
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|TrainerName=Roger Slykhouse
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}}{{Equipment Trainer
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}}
 
}}
 
}}

Latest revision as of 14:36, 27 August 2015

Laser Cutter - Bumblebee
Laser cutter 110212.jpeg
Name Bumblebee
Zone Laser Cutter
Owner i3Detroit
Make Model Jinan G. Weike / WKLaser LC1280
Part Number
Date Acquired
Storage Location West wall, you can't miss it.
Authorization Required Yes
Status Running
Value $6000
Documentation The setup manual, File:OPERATIONAL MANUAL OF MACHINE xin USB.pdf is worth reading, if only for a laugh.

Inside the cutter, a Leetro MPC6515 control board coordinates the motors and laser firing. Its documentation is freely downloadable.

Other References

Intro

This is one of the two nearly identical laser cutters in the space. They have 3'x4' beds and 150 watt tubes. This one is named Bumblebee becasue it is yellow and black, as compared to Wolverine, which is yellow and navy blue.

Rules

If you are not trained yourself, operation of the laser cutter must be done under the supervision of one of the trained operators. (A list can be found on the clip board in the zone) Trained operators are: Matt A., Roger S., Nate B., Terry W., Andrew M. and Devon T. See the section below about Damage Prevention.

i3Detroit asks that users donate $0.25 per minute or $15 per hour that the beam is active. This is to replace consumables, especially the expensive bulb. There is a wooden donation box.

Approved Materials List

Instructions

Get material that will fit on the bed of the laser cutter, which is 3'x4' (optimal cutting area 34" x 46"): 4 feet wide from left to right, and 3 feet long from the front to the back. Your piece must be able to fit on the bed itself, because the bed will lower to put the surface of your material in focus. However, in case anyone needs to know the whole interior of the bay for some reason: there is 51 inches of clearance between the two rails the gantry runs on (the same width as the machine's bay door). 51 inches is also the measurement from the front lip to the back wall of the machine, but the door itself takes up 3/4 of an inch of that.

General Instructions

Time-of-cut Checklist

  1. Place material (square to edge of honeycomb).You can also run the head left / right and watch the red dot to see if it moves parallel to the edge of the material. Adjust as needed.
  2. Cover inactive honeycomb area except an "intake" in front of the material. This directs smoke away from the gantry.
  3. Turn on POWER STRIP on floor behind cutter. This should bring up the chiller and air-assist pump.
  4. Gently pinch rubber hose from laser to chiller to trigger chiller alarm, verifying that it's awake.
  5. Assure the exhaust is open on the back of the unit, right next to the chiller. Slide the door all the way open (to the left).
  6. If the other machine is not in use, cover the vents at the back of the OTHER machine to increase the exhaust flow.
  7. Make sure there is nothing obstructing the path of the laser head toward the right rear of the working surface!
  8. Turn keyswitch to on, and wait for boot and home to complete.
  9. With the D-pad, jog head over to center of material.
  10. Check the lens for debris, and clean if necessary, especially if cutting something smokey like wood or MDF.
  11. Press "Z" to enter the mode to raise or lower the bed.
  12. Set the focus with one of the acrylic manual focus gauges.
  13. Press "Z" again to exit Z mode.
  14. Open the quarter-turn valve on the wall (and the one feeding the compressor to the building) to supply air to the cut. The regulator should be set lower than 40psi.
  15. Wave hand under head and verify that air-assist is blowing.
  16. Download design from LaserCut software.
  17. With the D-pad, jog head to start of cut.
  18. Keep one hand over emergency-stop while using the "Test" button to check boundaries.
  19. Turn on the exhaust fan (black switchbox on wall).
  20. Lift the fire extinguisher and set it back down. This verifies that your muscle-memory knows where it is.
  21. Press "Start".
  22. DO NOT WALK AWAY. See http://www.thinkhaus.org/2011/04/03/lazzoring-is-serious-business/ for why.
  23. When cutter finishes, observe elapsed time on LCD and put money into box.
  24. Also, please remember to turn off the exhaust blower! The furnaces have to put back everything it removes.
Example of a correctly focused setup

How to use the manual focus gauge

The manual focus gauges are in the laser cutter box. They are small L-shaped pieces of acrylic with "69mm For use with 63mm lens" engraved on them, corresponding to the 63mm focal length lenses currently installed in the laser cutters. To check the focus, place the gauge on the surface of the material you are cutting. The underside of the nib should rest against the top of the knurled fitting, as shown in the pictures to the right.

To re-cut the manual focus gauge, or to modify the file for a different lens, use the files found in this thread.

Maintenance Info

How To Calibrate The Auto-Focus

From time to time the auto-focus gets out of alignment for various reasons gradual or sudden. The depth-finding plunger is at the wrong height. One of two things have usually happened. A: the depth-finding plunger is at the wrong height on the lens cylinder; or B: the depth-finding plunger is at the wrong height in its (gold-anodized) holder. Note: the telescoping of the assembly relative to the crossbar does NOT affect the focus, it affects the height of the honeycomb relative to the outside edge of the laser table when focused.

To adjust the autofocus, use the plastic gauge (as shown above). Adjust the position of the probe in its holder and the position of its holder on the black tube so that the top of honeycomb surface is approximately even with the surrounding edge, and there is enough of a gap between the holder and the top of the knurled ring to allow the gauge to fit between them. The set screws that secure the probe bracket to the black tube should be below the bottom edge of the crossbeam that supports the laser head.

When you are done, make sure the nozzle is tight on the end of the black tube (thumbscrew on side is also tight) and the nut that controls telescoping of the lens assembly in the black tube is also secure.

Cleaning the laser head

If speed for CUT in 1/8" MDF falls below 20,then check the focus and have a trainer clean both mirrors and lens.

Trainers:

  • Use alcohol from the laser box and cotton ball.
  • The convex lens side goes toward the laser.
  • The capture ring tool is in the white box.
  • Use tweezers for removal of o-ring.

Power and Speed Rankings

TW- I have noticed that the laser seems to lose power over time. To better get a handle on this I am going to start running Cut Rankings. Every time I use the laser, I will make a test of small squares on the 1/8 mdf, which is usually around as scrap, for cutting at 100 power. They will be staggered at speeds of 5.10.15.20. I will put the results and date. If others could do this to we might start to see what we need to do. If these settings are outdated, do your own test cuts as too low a speed produces a lot of smoke.

  • Cut means fall out / Popout means req'd push to release / No Cut means not seperable
  • 6/2/13 1/8 MDF 5 CUT 10 CUT 15 POPOUT 20 NO CUT
  • 6/9/13 1/8 MDF 5 CUT 10 CUT 15 POPOUT 20 POPOUT
  • 6/10/13 1/8 MDF 5 CUT 10 CUT 15 CUT 20 POPOUT
  • 6/11/13 1/8 MDF 5 CUT 10 CUT 15 POPOUT 20 POPOUT
  • 6/12/13 1/8 MDF 5 No CUT 10 NO CUT 15 NO CUT 20 NO CUT
  • 7/31/13 1/8 mdf 30 cut 33 cut 37 popout 40 popout
  • 8/6/13 1/8 mdf 20 cut 23 cut 27 cut 30 popout
  • 8/12/13 1/8 mdf 20 cut 23 cut 27 popout 30 nocut
  • 11/14/13 1/8 mdf 12cut 20 no cut
  • 11/14/13 1/8 mdf AFTER Cleaning 20 cut 25 cut 30 popout

Sources for Replacement Parts

Sector67 suggested http://www.ebay.com/usr/strut-your-stuff-here part #NP1190-150

Damage Prevention

The most common way the laser can injure itself is colliding its plunger with something when it moves itself. Moving itself takes place during a job, when going to the logical origin that has been set to begin or end a job, or when homing to the upper right corner of the bed. Homing takes place when pressing the Datum button, or when the machine powers on, such as recovering from an emergency stop. If the plunger is mounted on the wrong side, it can collide with the machine frame during homing. The plunger can collide with material or with weights that are holding down material. During a job, sometimes a flexible material will lift off the bed through heat curling, or when cutting releases its pent-up spring energy. Continuing the job might cause the head to collide with the newly-emerged edge.

Only use the auto-focus feature (z-datum) when plunger is over material. Otherwise, the plunger tip goes into the honeycomb without being pressed down, so the Z-motion doesn't stop itself, and crushes the lens head into the bed. Keep your hand over the emergency stop when auto-focusing. Everyone should practice hitting the emergency stop button. Pressing the emergency stop does not cause an emergency.

Be very careful when removing the emergency stop, because it homes itself during every power-on. So, be sure the lens head is free. If the table is so high that the plunger is stuck in the honeycomb, open the lower doors of the laser, manually pull the belts on the screws so that the bed goes down. After this, this procedure will have to be reversed, measuring the distance from both sides of the bed to both sides of the gantry.

Coolant failure will destroy the laser, so each time the laser is used, squeeze the coolant tube to ensure that the alarm would go off.

Be sure the exhaust is on, or the smoke gathering in the machine will damage the mechanics, the optics, and any nearby humans.

Never laser-cut polycarbonate. It is highly flammable, and will produce toxic, highly corrosive smoke. Also do not cut plastics containing chlorine. Acrylic and delrin are currently the only known-safe plastics.

Before cutting something with an reflective surface, consult a user who is qualified for training or maintenance.

If material catches on fire, hit the emergency stop, yell "fire", and use the fire extinguisher mounted to the front of the laser. Pull the pin, and spray carbon dioxide gas in a sweeping motion over the flames. It just dispenses carbon dioxide gas, not foam. This will do no damage. It's just loud.

FAQ

TroubleShooting

Power won't come on, or shuts off during use.
Check the other items on the same line, such as the laser computer or the overhead light. If they work, make sure the laser is still plugged in. If the power is off to the whole line, the breaker box is located in the back corner in the wood shop. Flip it back on, and you should be good to go. (This is a known issue, and a more permanent fix is being discussed. Until then, apologies for ruined cuts)
When running TEST I get a SOFT STOP message on screen and no test.
That usually means your cut runs off the laser table. Check your origin point on the file and where you have the laser head starting. Sometimes it means that Logical Origin is set to ON which places your cut off the table, no matter where you have manually set the laser head.
How can I turn off Logical Origin?
To Cancel Logical Origin use the keys on the Control Panel on the Laser and the Control Panel Display.
  1. Hit ESC 3 times.
  2. Hit the RETURN key (the one with an arrow that goes down and to the left). This should highlight the current file name.
  3. Hit RETURN again. This should pop you to the Logical Origin screen.
  4. Hit Right Arrow until the field Cancel Logical Origin YES is highlighted.
  5. Hit RETURN.
My Test doesn't start where my laser head is and I have turned Logical Origin off
  • Make sure to check the IMMEDIATE box and save before Downloading AND turn off Logical Origin to allow the origin to be the manually set position of the laser head.
  • This could also mean your cut is running off the table, or close to the edge.
It takes several minutes or infinite minutes to compile in LaserCut
I have had this happen with some (but not all) DXF files from OpenSCAD. Open the dxf file in CorelDraw and then save it as dxf. It will "clean it up" and you compiles will now be very quick. I have no clue what is happening.
When cutting 1/8mdf through it takes 100% and slower than 20 speed.
Check Focus. If problem persists have trainer clean lens and mirrors. DO NOT attempt cleaning if you are NOT a trainer.
When downloading file to laser cutter, no file appears in the DownLoad window or on the laser cutter
Your file is too big (some combination of actual size and complexity of design) to be transferred via the cord. You can download your design directly to the laser cutter via USB flash drive.
  1. In the LaserCut Download window, choose "Export file" instead of "Download Current"
  2. Find the files, a .mol and .txt and put them on a flash drive. They don't need to be the only files on the drive, but probably should be the only .mol file
  3. Plug the flash drive into the laser cutter USB port. The port is located on the right side of the laser cutter, about 2 feet off the floor near the front edge. (someone should add a picture of the port location)
  4. The file will be downloaded automatically- it might take a while to download, but it'll give you the progress as it goes.
  5. Proceed as normal- you should see the name of the file in the menu as usual.
The laser head moves through the design, but the laser doesn't fire!
  • Laser power setting in LaserCut should be above 17.
  • Check the air nozzle to make sure it isn't knocked out of whack and blocking the laser path. Check the mA meter just above the control panel. If it jumps up around 10-40 mA, then the laser supply is firing and just getting blocked
  • Make sure the chiller is on (safety interlock)
  • Make sure the door is all the way closed. The door interlock uses a small magnetic sensor on the front right bezel into which the door sits when closed. The magnetic sensor requires a small gap between it and the magnet. If the door requires re-alignment, TELL A TRAINER. DO not try to fix it yourself, just let someone know to re-align it so you don't make it worse.

ToDo

New cylinders to hold different lenses,
...to make it easy and safe to change them without smudging or damage. Sector67 has indicated they may make some of these. (The existing cylinder has too narrow an opening for the lens that gives a long focal length. Its beam is so wide that it hits the lip and heats up the cylinder.)
Payment-measuring timer.
One way to do this would be to measure current to the machine and time how long it runs at laser-firing power. It would be good to put a button on the timer that would re-set it to zero.
Another way, used at other spaces, is to use the "blow" output contact from the controller, which is meant to trigger the air-assist, in case bottled gas is being used for special cutting.

Done

Payment box.
Greg Smith made it.
Laptop desk.
Standing desk built by Dustin White & Ted Hansen.
Aperture in the chassis, through which to thread the blue USB cable with a grommet.
Instead, we discovered an exit under the machine and threaded it through that. Matt Arnold used sugru on the side of the standing desk for a place to attach the end of the cable when unused.

Authorized Users and Trainers

User Name Authorized By Authorized Date
Leonard Devon Truscott 2013/08/20
Matt Oehrlein Devon Truscott 2013/08/20
Kevin Flory Devon Truscott 2013/08/20
Jamie Burdeski Devon Truscott 2013/08/20
Mike Fink Devon Truscott 2013/08/20
Marie-Therese Enga Devon Truscott 2013/08/20
Eric Merrill Devon Truscott 2013/08/20
Brian Wennberg Devon Truscott 2013/08/20
Ryan Ball Devon Truscott 2013/08/20
Jessica Rowland Devon Truscott 2013/08/20
Elena Ilieva Devon Truscott 2013/08/20
Josh Bacon Devon Truscott 2013/08/20
Andrew Meyer Devon Truscott 2013/08/21
Kathy Joyce Terry Wynn 2013/08/21
Jim Kemp Roger Slykhouse 2013/08/22
Brace Stout Devon Truscott 2013/08/23
Derek Kuschel Devon Truscott 2013/08/23
Chris Platzer Devon Truscott 2013/08/23
Alex Bellak Devon Truscott 2013/08/23
W. Scott Richardson Nate Bezanson 2013/08/23
Steve Nowicki Roger Slykhouse 2013/08/26
Greg Smith Devon Truscott 2013/08/20
Emma Whipple Matt Arnold 2103/09/02
Daniel Ungar Devon Truscott 2103/09/03
Devin McPherson Nate Bezanson 2013/09/07
Adrienne Patterson Matt Arnold 2013/09/20
Nikki Metivier Matt Arnold 2013/09/20
Jeff Bannow Devon Truscott 2013/10/01
Javier Fernandez Nate Bezanson 2013/10/05
Adrienne Johnson Devon Truscott 2013/10/22
Krostoffer Marshall Devon Truscott 2013/10/22
Thomas Shui Terry Wynn 2013/11/07
Anthony Graziani Nate Bezanson 2013/11/07
Matthew Huber Nate Bezanson 2013/12/03
Bill Putt Nate Bezanson 2013/12/11
Kelly Carnahan Matt Arnold 2013/12/13
Nick Sternberg Matt Arnold 2013/12/16
Roberk Kapatais Terry Wynn 2014/01/16
Katherine Montalto Terry Wynn 2014/01/23
Rob Lifton Nate Bezanson 2014/02/04
Jacob Runyan Nate Bezanson 2014/02/28
Aaron Prunkard Devon Truscott 2014/04/01
Nate Warnick Devon Truscott 2014/06/12
Tyler McCardell Nate Bezanson 2014/06/27
Chris Bohinsky Nate Bezanson 2014/07/02
Benjamin Fedorka Andrew Meyer 2014/07/19
Joe Bender Andrew Meyer 2014/07/19
Lyz Luidens Andrew Meyer 2014/08/22
Matt Gardeski Andrew Meyer 2014/08/22
Ken Siegner Nate Bezanson 2014/09/14
Lewis Dennison Nate Bezanson 2014/10/27
David Henry Nate Bezanson 2014/12/19
Jamie Palmer Roger Slykhouse 2015/01/10
Jonothan Douglas Roger Slykhouse 2015/01/10
Nikki Weltman Nate Bezanson 2015/01/27
Justin Triplett Mike Fink 2013/08/20
Konrad Brown Mike Fink 2015/03/03
Brad Tarratt Mike Fink 2015/04/03
Sam Letvin Nate Bezanson 2015/05/23
Thomas Trahey Mike Fink 2015/05/24
James O'Dell Mike Fink 2015/05/24
Trainer Name Certified Date
Devon Truscott 2013/08/20
Matt Arnold 2013/08/20
Roger Slykhouse 2013/08/20
Terry Wynn 2013/08/20
Andrew Meyer 2013/08/20
Matt Gardeski 2013/08/20
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