I cut a lot of threads and taper threads are always a but confusing to me to program. This video simplified the process and I have it saved for reference. Thank you!
Just the other day I had to cut some 1/8 NPT plugs on a 90s era CNC hardinge. Used the two block G76 with the R value. No one else in the shop knew how to operate that lathe because they only know the guide i control. Really does pay to know your G code out in industry!
Thanks for this Video Very nice and simple explanation just another easy way to calculate the dimeter (X value) of the start thread ( 3/4=0.75 divide by 12 =0.0625 * (0.7815+0.2)=0.06134 subtract from OD 0.840 - 0.06134=0.7786 . no need to calculate the angle and trigonometry to obtain X value of the start thread
My shop used 1/8-27NPT for a grease nipple on pivot arm for a Shuttlewagon. The machinists before me had a ground tapered reamer before the tap. But upon closer inspection the reamer wasn't doing anything at all! Then I found out for 1/8-27NPT you don't need a reamer. Cut down some of that cycle time!
Haas is a 1 line control. Like a fanuc 10 t control. Try this way. G76 X0.732 Z-0.8815 R-0.0306 D0.0191 A60 P3 F0.0714 Then i like to add a line under the G76 line for a finish pass like this. G92 X0.732 Z-0.8815 R-0.0306 F0.0714 And that should work ok. I hope this will help.
@@mattschmelzer1736 for internal pipe threads, would you take the thread height x2 then subtract that from the D-value in machinist book first and use that number to figure your dimensions for G76? Hope that makes sense. Thanks!
Where can you go to work and actually program settuos, like what your doing, not just cam software everything, would that be more of a service industry thing, not a production factory?
I tried your code on a simulation software and it cuts threads but the taper was inverted? I had to change the second line R value to a positive instead of negative. Is this a value that can change because of certain machines? Or is the sim wrong? 🤷
Wow, I just realized in forty years of manufacturing in the aerospace industry and across many machines, I had never single pointed a common pipe thread.
Am I the only one who thinks this is wrong? I get about .812" for the starting point of the OD by adding the mean thread height to E0(pitch diameter at beginning of external thread). and a taper length of about .442(which falls in between the L5 and L2 points. L5 is supposed to be the last complete thread and beyond that the truncation at the crest grows. by turning the front down to to only .791 I don't see how this doesn't put the thread height and truncation completely out of tolerance even though a proper pd and root means it would still pass the L1 ring gauge. Maybe it doesn't matter so much for a normal npt but I'm thinking an nptf would never dryseal doing it this way.
If you're going in an extra .100 (-.8815), wouldn't you're starting point be at Z.1 instead of Z.2? Doesn't that change your taper if you don't, or am I missing something??
