ID threading lathe

[100]

I need to cut an id thread.. How can I check the thread size and then pick up on the thread and take another finish cut...

[PBMW]

use a gage.
As long as you don't move the part in the spindle, the machine knows whare it is.

[DareBee]

Yes a gage.
Bolt, screw, threaded rod or tap.
Or for custom sizes I usually have an external thread made first to the correct sizing (gage).

On second read thru - it seams that you are asking more about the machine as opposed to the thread checking.

The spindle will pick up a "home" signal and start from there. Try it on a test piece first if you wish to verify it will.

[Geof]

Originally Posted by 100 I need to cut an id thread.. How can I check the thread size and then pick up on the thread and take another finish cut...

After you have checked the thread size push the green button again.

If you want to make the thread slightly larger the easiest way is use G92 and add an extra pass a few thou larger.

[100]

I can measure the thread but the question is about picking up at the same spot... I program off line and then send over... If I adjust off line and then send over it seems like its not picking up? I will play around with it some more...

[Geof]

Originally Posted by 100 I can measure the thread but the question is about picking up at the same spot... I program off line and then send over... If I adjust off line and then send over it seems like its not picking up? I will play around with it some more...

What prevents you editing on the machine, you are using a Haas.

[PBMW]

OK...Now I'm REALLY confused. Why on EARTH would you need to reprogram something because the size was wrong???? Offset the thread tool.

[TR MFG]

Are you using a threading cutting cycle to cut the thread. I Always use G76....The P value on the second line can be used to adjust thread depth at the control....

matt

[dcoupar]

Why not adjust the X Wear or Geometry offset + a couple of thou and re run the thread tool? As long as you don't move the part in the chuck, or change the Z offset and don't shift gears (just my theory), the encoder should pick up the lead. You are using a G76 or G92 cycle, right?