I have a small lathe that I set up to use a servo drive on the 
spindle, essentially making the spindle a rotary axis.  The servo was 
large enough to provide the torque needed to make the cuts and it 
made coordinated spindle moves wonderfully. (think thread cutting, 
cam grinding, milling cutter relief grinding etc.)
The only problem was that there was no simple way to set the spindle 
back to zero degrees WITHIN a program without actually "unwinding 
it".  I searched long and hard for a solution and was finally 
convinced by those who know a lot more about the workings of the 
trajectory planner than I (which would be anything at all) that it 
can't be done for the reasons just explained.

By the way if there have been any changes in LCNC that let you "home" 
or set the rotary axis back to zero without exiting the program or 
actually running the axis back to zero I'd like to know about it 
since I haven't looked into it for over 10 years.

Cecil


At 06:18 PM 1/4/2016, you wrote:

>Or have I missed something?
>
>Marcus
>
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