setting Rotary 4th axis zero

[octhesax]

HI guys,

I need some input here. I'm doing some fadal 4th axis work (cam tracks on a cylinder with cyclodial motion) and I'm trying to set my zero in mastercam to be the same as the machine "A" axis zero. I have done other parts before but the A axis zero is not the same. I always need to put in a workcoordinate A axis offset(i.e. 90deg) to match up to my program "A" zero. In mastercam, I set A0( at the top. But when I backplot, the part rotates before the cut starts. It traks in the right place and the output is good. I just want to know if there is a way to get the same zeros. thanks for any input guys,

scar

[Mark C]

This sounds like the same problem I had

Check out this link:

 

http://www.emastercam.com/ubb/ultimatebb.p...ic;f=1;t=004693

[octhesax]

Thanks marc,

that link shed some light on my problem. I shall experiment.

scar