General CNC Chat > Show"N"Tell ( What you have made with your CNC machine.)

Milldred gets some

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Chris.Botha:
Thanks, the casts came up ok.

Chris.Botha:
Some help from you smart types... I had this same config a few years back, and it was silky smooth, but when i run code now its jerky..

the path that is running is doing a series of XYZA, followed by a B, then repeat.

If I manually jog the machine pressing XYZAB its fast and smooth even at 1200mm rapid.

Mach3
UC300 motion controller @ 100khz
Mach set to 100KHZ
Look Ahead on 1000 or even 2000 makes no difference.
Constant velocity is set on.

any tips?

https://www.youtube.com/watch?v=5W9KAiYdED0

Chris.Botha:
(i changed CV stop angle to 180 which dramatically improved things, can achieve 2000mm/min smoothly, what does changing that achieve? does it reduce accuracy somehow?

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