Vibration in Plasma cnc.

[shimmwagen]

retrofitted a 5 x 10 plasma table that was built by fast cut and ran dynatorch software. belt drive machine, was having issues with motors and dynatorch so went with fabcut/flash-cut set up. old motors were servo and new ones are stepper. i'm getting a lot of vibration and 'saw tooth' profile on cuts when X and Y are moving together. have been back and forth with fab-cut but couldn't get it to work better. we slowed down the cuts and helps a bit but something still wrong. someone suggested reducing torque on the motors?


3 AXIS 8 AMP PRO-SERIES MICROSTEPPING CONTROL
BOX INCLUDES:
( ) FLASHCUT CNC SOFTWARE
( ) (1) 3 AXIS 8 AMP MICROSTEPPING CONTROL BOX W/
70VDC POWER SUPPLY

MP-2303
NEMA 23, 454 OZ-IN STEPPER MOTOR WITH XLR
CONNECTOR AND STRAIN RELIEF

even when i rapid jog machine in x and y the head shakes, which gets me thinking motors have too much torque??

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[joeavaerage]

Hi,
what happens if you move slowly?

It sounds to me like the steppers are exhibiting a mid-band resonance. If they are running in full-step and even sometimes in half-step mode they can get a resonance
similar to what you describe.

What microstepping regime are you using? Most find the 8, 10 or 16 microsteps per full step is a good compromise between signalling speed and motion smoothness.

Craig

[shimmwagen]

slow movement is fine. i'll check out the microstepping if i can find it and see where it's at.