Need Help! G76 Thread code from Featurecam - CNCzone.com-The Largest Machinist Community on the net!

clemmie21710 · #1 01-28-2010, 06:55 PM

I am running a Methods Slant bed 1 and machining a 3.0 X12TPI external.
The G76 code came out with the following :G76x-2.86 Z-.650 K0.07 D00107 E12. A60.
My threads came out .034 under size on the pitch diameter. I am thinking the X number is wrong but not sure. Can any one give me some help on this?

Dave.

dcoupar · #2 01-29-2010, 02:05 AM

According to the Machinery's Handbook 25th Edition, the minor diameter (X) should be 2.9008 and the height (K) of UN external thread should be 0.04511

clemmie21710 · #3 02-01-2010, 07:46 PM

Thanks for the help, that iis what I used for the code. I also checked with the wire method and it came out within .oo2 of the minor. Thanks again.

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