Thread: Threading problem

Originally Posted by Abratool

Mike
I tried to take a photo of the tool I used for the same job, but my camera does not take good closeups.
The backplate I bored & threaded was cast iron.
Cut like a breeze
If you lived a bit closer I would call around to assist
Bruce

No worries . Yes, Dural is more than a brisk walk from here !

Bruce, look for a setting called macro.

Originally Posted by Bryan

Bruce, look for a setting called macro.

Bryan
Thanks for the hint.
I think I have it worked out now & will try some close up photos soon.
regards
Bruce

Just read through this and a lot of technical and useful advice for sure . One thing that occurs to me is that the tool should always cut on the leading edge ,especially when you have set the compound slide at 30 degrees for a 60 degree angled thread. Without seeing your setup or knowing your experience as a turner (obviously tool grinding is not really a problem) hehe, I am wondering if you have set the 30 degrees correctly, by that I mean you need to have the compound slide set from parallel with the cross slide offset by 30 degrees from there ,which is half the included thread angle , this way when you come back to your starting point on the cross slide each time ,then progress the toolcut deeper in ever smaller increments you will be only cutting on the leading edge ,which is the purpose of the exercise. Simply put on an external thread you bring the compound slide to parallel to the cross slide and the winder handle close to you then do your 30 degree offset to the right hand side .so any movement of the compound slide is to move the tool point closer to the chuck end .On internal threads the offset is from the back end of the cross slide offset the same 30 degrees so again any movement of the compound slide moves the tool point closer to the chuck end of the job Then again it all changes for left hand threads How could something so simple be so long winded hehe, but I hope thats not all too confusing , picture would be much simpler and explain it in a second cheers ~ John