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...

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

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.

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.

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...

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.

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

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

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?