Need Help!- Komo VR-408 CNC Router

[Bada Bing]

Does anyone know how to stop the X-axis servo motor from groaning while sitting idle on a Komo VR-408 CNC Router?

[CNCRouterMan]

Turn machine on. Home it. Loosen the bolts on the gantry. Move back and forth at a slow speed a couple of times and tighten up bolts. The groaning or humming is caused by the servo's fighting each other.

[Bada Bing]

I am not sure which bolts the gantry bolts are?

[One of Many]

A Komo VR-408 is a stationary gantry, X axis moving table Router. There are no servos fighting each other. The gantry is welded to the base frame. If it has absolute encoders, there is no homing procedure either...

Mechanically, there could be excessive drag on the linear rail trucks, ball screw issues, ball screw support bearings or motor/ballscrew coupling.

It may have Fanuc AC servos. I'd also suspect a lag between the motor coupling and the encoder, Hum is often the feedback/servo system hunting with overshoot due to external forces resisting it coming to rest. Or not knowing it should be at rest, the tuning has deviated from null at idle.

You may only be able to take care of the obvious, but a field tech could have it cured before it stresses the electronics into failure as it generates heat into all in the loop.

DC

[dadelmann]

You say it hums at idle; does that mean at any X position or only at the home position? For example if you let it idle when X is at its center of travel will it hum?

[Bada Bing]

yes it humms at any -X- position.

[CNC_Monkey]

KOMO's have a free lifetime 24/7 tech support line.

[techdir]

have you looked at the servo brake circut? I have a vr1008 twin table that does the same! try a power conditioner in the braking circut!