Minimizing C-axis movement on UMC-750 post

[SDMSRobotics]

Hey, I've got a big part here that is a little bit to big to rotate around all the way on the Haas UMC-750.  To help with this, I re-enabled the negative b-movement option in the UMC-750 post processor, however it gives me C-moves that are unnecessarily large.  Specifically, it rotates the part around 180 degrees more than I want it to:

N19705 M9
N19710 M1
N19715 T4 M6
N19720 S12000 M3
N19725 G54
N19730 G53 G0 X-29. Y-8.
N19735 G255
N19740 G0 B6.73 C153.245

Instead of the table rotating counterclockwise 153 degrees to reach C153, I'd like it to just rotate clockwise 27 degrees to reach the same orientation.

[Anonymous]

Hi,

I'm sorry I can't help you on minimizing C-axis movement on UMC-750 post but maybe you can help me. How do I re-enable the negative b-movement option in the UMC-750 post processor? I have a number jobs that could utilize this feature. 

Thank you,

Geoff

[SDMSRobotics]

Hi!

Re-enabling the negative B-axis motion was actually part of how I resolved this issue.  How to do it is to change line 378 in the current UMC-750 post to

var bAxis = createAxis({coordinate:1, table:true, axis:[0, 1, 0], range:[0-35, 110+0.0001], preference:-1});

Thanks!

Alex