[Witsenburg]

Hi,

I have built a CNC 4-axis foam cutting (hot wire) and the fine tuning is well under way. I run into a big resonance problem. I run the machine at a very low speed, and the motors resonate so hard the whole machine vibrates. The vibrations even cause the foam to move about on the table when I move the wire at cutting speed outside the foam. The problem is gone when I increase the speed, but to cut the lower speed and lower amp setting on the wire give the best results. So, I need to reduce / get rid of the resonance.

I am thinking about increasing the microstep settings on the controllers, and change the steps / millimeter setting in the software. Would this make a change, are there any other suggestions worth trying? I would not like making a belt drive between the motors and the spindles to increase motor speed at the same spindle speed.

Cheers,

Hugo

[Zenji]

this is the question that this website was founded on 15 years ago, geckodrive made lotsa money solving it.

that aside, maybe play with amp settings, if 8 wire motor, wire for parallel, dampening the motor mounts with grommets.

i have always felt it had something to do with switchmode powersupplies - current arrives in steps, departs in steps, and at certain frequencies it hits a sag.

[H500]

A simple solution would be to add a resonance damper to the motor. There are many ways to do this.

http://www.cnczone.com/forums/steppe...er_damper.html