On Apr 15, 2011, at 2:08 PM, andy pugh <bodge...@gmail.com> wrote:
> 
> If you _only_ have index then you have to be very sure that the spindle speed 
> won't vary during a cut.

Does EMC compensate for spindle speed at all in this case, or is the second 
encoder required for that? I don't generally expect any more from my threads 
than that the nut go on and not slip off. I can see where a single pulse 
encoder will give a delayed feedback if the speed drops sharply (most likely 
when the tool first encounters the workpiece I suppose)...
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