[AJ961]

I have a few bolts that require 9/16-18 3B internal threads. I decided to try threading on the TL-1 lathe but something is not quite right.

Drilled bolts with 33/64 bit. I input the data such as minor diameter of .506 and major of .5625. After performing the thread function the threads will not accept a 9/16-18 bolt. I ran a hand tap through them and it was pretty tough being the bolts are so hard.

I have no idea what could be wrong. The thread insert is a dedicated insert for cutting 18 TPI.

I'm thinking maybe I did not set the "X" deep enough into the material. As soon as the insert touched the stock the X diameter measure was set.

Really appreciate any input with this!

Adam

[djr76]

adjust your wear to a positive number till you get a desired result.

[AJ961]

Thanks djr76. I will do that. I have another question.

I've programmed the ID threading for these bolts with M30 at the end. If I understand correctly, M30 will return to the starting position. So, if I adjust the wear to a positive number and run the program again will the thread insert engage the threads properly to cut out whatever positive number entered in the wear box?

Thanks,

AJ

[djr76]

As long as you dont remove the part, it will infinitely start at same position programmed.

[AJ961]

Thanks, really appreciate the help.