Blind Threading

[Smithdoor]

Here the way I do blind threading
I found a drawing on internet showing the why I do blind threads since 1970's.

Dave

 

[RJSakowski]

Here the way I do blind threading
I found a drawing on internet showing the why I do blind threads since 1970's.

DaveView attachment 475518

You should be setting the compound to 30º on the opposite side of the vertical so you are cutting with the leading edge. Or just use the cross slide to advance the threading tool.

 

[Smithdoor]

You should be setting the compound to 30º on the opposite side of the vertical so you are cutting with the leading edge. Or just use the cross slide to advance the threading tool.

I put my compound at 90°.
The 30° was used for direct reading feed. I did find that out until 1979.
It grinding a lathe use about 11° for finer feed .

Dave

 

[wrmiller]

I had an electronic stop on my 1340GT (thanks to @mksj ) and threaded into the part/towards the chuck. A bit spooky at first, but I got used to it.