CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Servo Tuning Troubles

Posted by R Rogers
on 2006-05-19 11:23:57 UTC
I'd guess it's noise.

Move the encoder wiring away from the motor leads.

Use shielded cable on the encoder wiring and ground the shield on the controller end only.

Hope this helps, Ron

novacustard <rt@...> wrote:
Hi.
I have built a nice DIY CNC router with much help from ebay.

However, I have run into trouble with the servo tuning stage, to the
point at which I have just ripped a metal flexicoupling in half :(

While tuning the X axis, I have seen the commanded move of approx 50mm
take place ok, then the servo threw itself into reverse at max speed
for a seemingly random distance. This ultimately saw it charge through
the limit switches and rip the coupling in half.

The Y axis seems unable to move at all, each time flagging 'Position
Error Exceeded'.

The only axis that is behaving is the Z axis.

Sorry if this is a bit long, but any suggestions would be gratefully
received.

Many thanks,

Richard

email me at novacustard@here

where h e r e can be replaced by yahooDOTcoD O Tuk



Servos, drives, controller and software are all Parker/Compumotor,
Controller is a Parker 6K4, all connecttions are by ribbon cable or
power cable where necesary. (Not shielded).

X axis is an SE230AE with 10:1 gearhead and OEM770T drive with 75vdc
p/s and THK44 Linear Actuator with 1 rev to 20mm leadscrew and 500mm
travel.

Y axis is an SE230AE with 10:1 gearhead and OEM770T drive with 75vdc
p/s and THK33 Linear Actuator with 1 rev to 10mm leadscrew and 200mm
travel.

Z axis is an SE232BE direct coupled to unknown Linear Actuator with 10
rev to 25.4mm leadscrew and 200mm travel. OEM770T drive with 24vdc supply.








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Discussion Thread

novacustard 2006-05-19 10:17:31 UTC Servo Tuning Troubles R Rogers 2006-05-19 11:23:57 UTC Re: [CAD_CAM_EDM_DRO] Servo Tuning Troubles