Does anyone have a post for the Seimens 810D control. Please reply if you have one.

Thanks, Kevin

In version 6 it was easy to program spring cuts, interpolating a diameter in a bore for example. You could chain the diamond (it was a diamond in that version) twice around the profile and the cut would interpolate twice without returning to z clear plane. Thus performing a spring cut, how is this possible in version 8? You can use the "overlap" under lead in lead out. But this is not an exact spring cut, 360 deg.

Any suggestions?

Does anyone have experience using Mastercam to program twin spindle lathes with live tooling. Nakamura tw, Mori DL or ZL, or similar. Also is there a post available for this application? I am most interested in the Mori ZL post.

, Thanks Kevin

I forgot to add my question to the previous comment. How can I modify my post processor to output the feed for tapping to 5 decimal places? Some machines will accept 5 dec. places for rigid tapping. And obviously the more accurately the machine syncronizes the rpm and the feed of the spindle, the better the thread will be.

Any suggestions?

The feedrate for tapping on most cnc's is pitch times rpm. However some controls will specify that the pitch of the thread be programmed in the G84 canned cycle. 0.03125

for an 8-32 thread for example. And this can also be changed by specifying G94 or G95 before the canned cycle (feed in inches per minute or thou per rev). One way to see how much your machine will overtravel while tapping is to set the work co-ord above the part and watch the "distance to go" page while the machine taps. You will be able to see the distance to go value go from - to + if the machine overshoots the programmed depth. And you should be able to see by how much, because the machine will decelerate and reverse giving you a chance to see read the amount from this page. It's not %100 but it will put you in the ballpark. Only older or more primitive machines should experience this problem. You can also try programming high gear for tapping, and reduce the inertia so that the machine can reverse more quickly.

This is my experience anyway.

I have been using Mastercam for several years now and I'm looking forward to sharing

ideas and getting feedback from other users. I am a cnc programmer in a large cnc job shop in Vancouver. I use level 3 Mastercam and find it to be a good system, and there is excellent support. This forum being one example.