Any suggestions greatly appreciated.
Belt driven Diode laser with laser side mounted on a Hobby CNC machine.
4000mm/m 100% (Should have backed the power off a bit).
It’s the “squiggles” in the circles where I am looking to correct.
Will re run when I get a chance at lower speeds.
how low is the module vs the X gantry
Seems what you having is just a bit of harmonic vibrations on your module
Assuming is hanging a bit “low”
4000mm/min on a cnc frame might be a little optimistic. They weren’t built for speed. they were built for rigidity on contact cutting forces and torque
Maybe a picture of the machine would give some additional clues
i thought so
Pendulum effect on high speed
Of course you can cut speed and power in half
if there is a significant improvement you found the “WHY”
Not much you can do on a CNC setup except LIFT the material as much as you can vs the center of gravity of the X axis. which in your case is above the module
No, Re-tramming the router after removal is a pain.
Looking to add a second bracket or shims between the router and laser backing plate to remove possible harmonic movement and increase resistance on the slide to remove any Y axis movement.
I was also able to raise the laser by around 12mm on the slide plate. Hopefully will reduce X axis vibration.
Will be re running the tests @ 4000mm/m to judge any improvements.
If they are harmonic vibrations, which did look like it, shimming might help but wont fix it. you will have to literally break the frequency. higher speed or lower
I would still do a half speed/half power test to have a comparative
2000mm/m 30% after shimming, all is firm with the laser and mount.
But to me hasn’t changed the circle wiggles.
X axis backlash maybe? Since some circle ends don’t even meet up!
I have a cnc router/laser and I found that it was better to remove the router keeping the inertia down was worth the effort . Otherwise put up with less far speed.
Believe i need to concentrate on stepper motor calibration. This is at 2000mm/m and appears greatly improved. Ycal is very close to perfect x maybe still need work.
Going to calibrate using 600mm as a reference. 4k run was essentially the same. Speed doesn’t appear to be the factor.
A head with more mass takes more energy to accelerate it. Anything that hangs below the gantry/bearing point will act like a pendulum. Adding brackets may help but will exacerbate the original issue of increased mass. I have to assume you run the laser faster than your mill cutting wood or metals.
I would look at a change in acceleration values over all the other options you’ve tried.
It’s easy, quick along with it being at no cost. If you have the same issue, then you can return to this path, but I think you’ll see a change with a slower acceleration value.