I am running Elson's servo system and
EMC 2.2.6.
Over the last few days I have run
several hundred parts single point threading a M22x1.5 threads
without a single bad thread. Yesterday I switched to cutting a
M20x2.5 and suddenly on ever other part the lathe will rapid during a
cut. I had a similar issues months back and upgraded EMC to 2.2.6
and the issue went away. The lathe will go to the start the thread
it will do a brief pause for the index pulse and shoot off at G0
through the part. I went back to my M22 code and ran 30 parts
without fail, I even reduced the spindle speed to what I am cutting
the M20 at thinking I might get more noise from the VFD at the lower
end of the rpm band and no effect. I also increased the number of
passes on the M22 program to replicate the M20 program and no
failures.
Switched back to the M22 program and
the second part experienced a rapid on the spring pass.
Any ideas what could be the cause? Is
there a way to set EMC to never attempt a threading pass that is
faster than the G0 velocity?
Thanks,
Richard
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