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
@@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!
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!
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? 🤷
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.
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??
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.
You're a good teacher, congrats 👏
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
Where does the .7815 plus .2, why not just call it .9815, ?
awesome video!!!! before threading did you machine it straight to the major diameter .840?
No this part was turned to match the taper calculated. Thanks for watching
He very clearly said that they turned the taper, not straight.
@@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!
You can use the taper .0625 to calculate everything no need for rocket science math. Great video
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!
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? 🤷
Why won't this program work in a Haas machine? When it gets to the first g76 line it stops.
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.
In the G76 line add a K0.054 single thread depth . And a smaller D will give you more passes.
@@charliependergrass2772 Thank you so much!!!! 🙏🏼 I had the same issue on a HAAS.
Would you do internal 1/4-18 npt please?
How would you go about doing an 1/2 internal npt thread?
I suppose not were to start but I'm stumped on the trigonometry part of the process.
Matt, Could this be used on a Proto Trak 14- 40 lathe with an ELX control ? Bob
I do not have any experience on that control and not sure what code format it uses.
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??
I need help with a 1/8-27 npt external thread
Where do i start
How did you convert 3/4 taper into an angle 1.788 Pipe thread angle is 1.789910608 degree or 1degree 47 minutes 23 seconds
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.
In a repair shop with cnc it is must.
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.
no you're not the only one. It is wrong.....
give me pic of NPT chart
plese
beware of this video......he's wrong.
Don't call it trig, call it shop math. Otherwise it scares all the non-nerds away.
It's trigonometry, brother!!
do the same on Haas!!!
do the same on Haas!!!
do the same on Haas!!!