I have been troubleshooting my boss HP3655 for 3 days now. I have tried everything I can think of from four corner test, focal test, trying different speeds/powers and seems engravings are getting chipped from the edges of powered coated cups and glass on flat surfaces seem distorted. I have been engraving cups at 300 15P and 0.05. The machine cuts perfect and I don’t know what else it could be. I am still waiting on boss laser to call me.
Belts seem tight as well and laser beam seems to be shooting down correctly. Also know its not the rotary cause its doing it on flat surfaces as well.
Is there something in the software or re calibrating this machine? Is there a setting to stick to engraving inside only?
Can you upload a simple .lbrn file where this artifact is exhibited? Can do a quick check on the design to make sure there’s nothing inherent there that could cause it.
If not a design issue what I notice is that the artifact seems to happen along the same vertical area. If so, is it possible that you have debris or something along the X gantry or on the wheels/bearings/pulley that’s physically shifting the laser head at certain points of travel? I’d suggest doing a thorough review. Try manually moving the head assembly. Does it run smoothly and effortlessly? If not, might be something there. While you’re at it see if the assembly is properly secured. If you feel any play then that could potentially be a source of the issue.
Other thing to check, place some material directly up against the nozzle and do a pulse check. Use some method to register the material perfectly with the nozzle. Either by leaving an impression of the nozzle, using a jig, or some other means. Check for how centered the laser dot is in comparison to the nozzle opening. Do this for all 4 corners and center of bed. Any deviation from center could indicate an issue with beam alignment.
I don’t see anything inherent in the design or cut settings. Those look very clean to me.
What axis is your rotary on? And in which orientation are these being burned? I’m realizing I may have been looking at this wrong.
Realistically this can only be a few things:
misfiring of the laser
This doesn’t look like missing steps to me. Do these artifacts vary based on power level used? That could indicate in issue with misfires.
Beam alignment or potentially a loose lens might account for this but seems unlikely. But easy things to check. I’d suggest checking free movement of travel along the full length of the bed on the X gantry.
Rotary is on the Y axis. When I am engraving on the rotary its being turned to the X axis. I have done a 4 corner test and its hitting the center. Beam is coming straight out of nozzle. I tried another cup with a different logo and still not clean… Have 80 cups to get done and I am stumped.
I haven’t seen that but I have a different X mechanism than you. In general I’d suggest not moving quickly anyway as the steppers will induce a current that can feedback into the drivers. It’s possible that the lock is due to a magnetic field being induced but just speculating there.
Can you test the laser on some less precious material and see if the artifacts change based on power level?
It’s possible that the coated tumbler may be losing large flecks of material on the edges as the laser is ramping down. Clear acrylic and wood may be less susceptible to material marking than the tumbler at some lower percentage of full power.
This could also be a strictly thermal edge effect. Wrapping the tumbler in masking tape might insulate the tumbler and spread out the temperature change.
The only other wild guess I’d offer is to look at the ground path and motor wiring shielding for the rotary device itself. Taping the tumbler may create more static electricity than the belts and rollers alone and may worsen a source of random noise. Chassis bonding (grounding) the rotary back to the chassis of the engraver may keep static out.