Resonance issue & Upgrade

[justCNCit]

Purchased the 4 axis box & 4 400 oz in motors from Xylotex a few months ago. Since then running my large wood router, with 10 TPI screws, of course it doesn't travel fast. But at its fastest speed, 25 IPM, the motors lose steps from time to time.

I need confirmation that this issue can be mostly avoided by lowering the motor RPM, and going with 5 start 10 TPI screws instead.

Or, do I need to abandon steppers?

[ger21]

If it's resonance, just changing screws won't get rid of it, although you'll get much more speed. It's possible that the resonance may go away or get better, but it's impossible to tell until you try it.

If you have dual shaft steppers, you can make dampers that will greatly reduce or eliminate the resonance. http://www.cnczone.com/forums/showth...639#post256639

Or you can get some Gecko drives like the G540 4 axis drive, which will get rid of the resonance electronically, and allow you to double the voltage which doubles the speed.

No need to abandon the steppers, but the Xylotex is prone to resonance, and those motors are not a good match fot the Xylotex if you're looking for high speeds.

Regardless of what you do, switching the screws is still a very good idea.

[jhop2]

I have ACME 1/2" 10 TPI 2 start on mine. I run at about 60 ipm but can run at 80 ipm with no problems. I'm still learning so this is plenty fast for me. 269 oz-in motors.

Jim

[justCNCit]

I am taking Ger's advice on most issues. No plans to upgrade the drive, but after watching how these flywheels help the motors, I have ordered some up to be made at the machine shop.

The 5 start 10tpi screws came in about a week ago, and they have made a huge difference. Using 400oz in motors in a not very well tuned setup, once these ramp up they run at 400 inches a minute, at least for rapids.

The X won't even do 25 though I believe the axis has alot of mechanical issues. I also have not done cutting with these screws yet.

I expect gains when the flywheels are installed.