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Topics - chris64

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General Mach Discussion / Rapid movement problem
« on: February 24, 2008, 06:10:16 PM »
I've been working on a conversion for sometime now.  Anyway, I have my X axis semi-functional now but have a strange bug (I haven't bothered connecting my Y or Z axis unstil I get the bugs worked out).

Some info about the conversion:
Servos
USdigital 500 line encoders
Gecko Drives
Was a Wells Index CNC with a Bandit control.  Reusing the servo motors only.

PC:
Dell Inspiron Lap top, Pentium 3, 1.5gig
Opto-isolated breakout board

Here's the bug:
If I use the jog control (the thing that appears if you press tab) and either press the controls or hold the left/right arrow keys, the rapid runs great.  It sounds smooth and consistant like it did with my old controller.

If I run a rapid in MDI it runs terrible.  It runs very glitchy and staggers and sometimes will even throw the Gecko into a fault state.  Anything under 20 IPM runs very smooth.  I've been trying to tune the driver thinking it was the problem, but the fact that the Jog works so well leads me to believe it isn't the drive at all.

Any thoughts on this?

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