Kirk Wallace wrote:

>[snip]
>The symptoms don't seem to indicate what the problem might be. The only
>difference between a successful run and not, is whether a tool touches
>the workpiece.
>
>The plan now is to move the VFD to a steel enclosure.
>  
>
My bet is that the problem is with the VFD then :)  I'm reading youre 
description as "the spindle was running during the successful run".

You could also try running the program with no workpiece, but still with 
a tool in the spindle, though it would be really weird if that changed 
anything.  The only difference between running the spindle and not 
cutting and running the spindle and cutting is the load on the spindle. 
There may be a problem when the VFD gets warm or something, which you 
wouldn't see when doing dry runs.

It is strange that it always stops at the same location.  Is this true 
even if you use feed override to slow things down or speed them up, or 
if you tweak the spindle speed up or down?  Can you pause and resume the 
program and still have the problem at the same place?

Try removing more or less all of the G-code from before the problematic 
move, and see if the problem occurs.  Try doing only the problematic 
move (in a loop), and see if the problem still occurs.  Try looping hole 
17 or 18 and see if the problem shows up.

Again, my bet is the VFD, but who knows.  You have a weird probem here, 
it'll take a little debugging to figure it out :)

- Steve


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