Re: [CAD_CAM_EDM_DRO] Re: EMC2 Screw Cutting Problem

OK, glad it's more or less working.

When you say it's "hunting", what are you describing? Do you hear a
pitch difference, see the motors speed up and slow down, or something
else? Can you see that the spindle speed is relatively constant while
the XZ motors are acting screwy?

What kind of spindle speeds are you testing this with? EMC2 calculates
motor velocities 1000 times per second. If you run the spindle at
600RPM (10 RPS), then there are only 480 new positions every second, so
about half the time the motion controller doesn't see any movement. Can
you try a couple of threading moves at very high and very low spindle
speeds, to see if that makes a difference?

I'll point some of the people who actually use lathes at this problem
too, and I encourage you to email the emc-users@...
list. There are a lot of folks who know a lot more than me about
actually using EMC2 :)

- Steve

mart_wid wrote:

>Steve.
>It makes a change for me to be the first in something. I wouldn't
>stand a hope in hells chance of setting up EMC2 without the wizard -
>I just don't have the ability. Your advice has worked and got the
>threading working at slow speed but i've still got the 'hunting for
>the exact speed' problem. Can I ask you for one last piece of advice
>to sort this out and then I'll go and hassle someone else? Thanks
>again, Martin.
>
>