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Topics - stevencharette

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General Mach Discussion / Inconsistent feed speeds - any help?
« on: May 20, 2012, 03:50:51 PM »
Hi,
 Longtime lurker, first time poster here.  I can usually find a solution to my problem using the search function but I'm coming up empty handed on this one.

 I'm using Mach 3 on a small home-made milling machine.  Has run well for years.  Yesterday I thought "hey, I'll set the backlash on the Z-Axis, that should make my part depths more consistent".

  I set the Z backlash, previously set at zero, at .012".  This morning I noticed that the machine would slow on Y-Z axis feeds, which I attributed to the backlash; further investigation revealed that was probably not the case, as the backlash adjustment should only take place when the Z-Axis changes direction (I think).  At any rate, I have parts to make, so I set the Z-Axis backlash back to .000 and restarted the program.

  Now it appears that the problem was not related to the backlash, as it is still occurring randomly.  I'm feeding on the Y axis at 4ipm, the feed will randomly slow to .3-.4 ipm, then go back to 4ipm.  Sometimes once or twice a pass, sometimes more.

  Any help?


Thanks,
Steve

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