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I think my solution ought to work for what you are trying to do. It would limit output theoretically to +-180 from Rotary Zero. 'c$' is calculated using 'ATAN2', which outputs an angle of 0-360, so this should work to "phase shift" anything over 180 degrees.
I was having this same issue and your fix did exactly what I needed. If I had a part on the 0 side and wanted to machine on the 270 side, it would post A270. But, if my part was too big to go all the way around, I would have to manually edit the A270. to A-90. With this edit to the post, I now get -A90. for the 270 side, and A90. for the 90 side. Thanks!
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change 4th axis rotary output
in Post Processor Development Forum
Posted
I was having this same issue and your fix did exactly what I needed. If I had a part on the 0 side and wanted to machine on the 270 side, it would post A270. But, if my part was too big to go all the way around, I would have to manually edit the A270. to A-90. With this edit to the post, I now get -A90. for the 270 side, and A90. for the 90 side. Thanks!