Feed and speed discrepancy in MasterCam

The post is for a Vytek. The VAR has little clue. What is strange is that installing X seemed to make 9 also make this error.

BTW, we do also have a call into the VAR. However, it never hurts to have many counselers.

You should still be on maintence with your vendor if you just got X. Call the vendor and tell them you need your post updated, should be part of the deal. I had some issues with the posts as well, but the vendor straightened them out.

Secondly, you could go to

Alex

---Still love SmartCam---

Is the G code for feed rate a G95 which is feed per rotation? This appears to be what is going on in the above example.

This looks like a G94 feed code where feed is in IPM.

Not a Mastercam user, but there might be a check box somewhere to have the software default to G94 which you seem to prefer.

If you are still using ver.9 too, its probably using the X post now.

I may just be blowing smoke out of my @ here, but if the feed was in ipr, wouldnt the feed for a 5/8-11 tap be f.091? f.33 would be some course threads. And is this for a lathe?? That doesnt appear to be a tapping cycle at all. G97 is constant surface footage I think?

I think it is resolved. Thanks for the inputs one and all. I had the machinist set up a simple test case, we slowed the spindle speed way down and limited our test to one hole without the tap in the tool holder. This confirmed that the fead was consistent with the spindle speed and was what would be expected. Conclusion. G01 Znnnnn F nnnnn (ips not ipm). So the machinist may have been mistaken in stating that he saw F 20 in the code when F .333 was really there all along. The post file actually had a divide by 60 line in it to convert MasterCam's IPM feed to IPS.

There has to be another reason for the tap breaking. OE, machine fault, bad setup, we won't know till tomorrow.

Thanks again. Case closed.