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Working on my South Bend 9C

@Golem Pens is doing fantastic. He’s come a long way since his beginning. I comment rarely on this thread, because most everyone has it covered. But I love seeing his progress. It reminds me of my beginning into machining… and the spiral that has led me down.

I see a mill in his future.

Back to the topic before on his thread cutting. The HSS tools results look much better. A couple tricks that work really well for me, one to be generous on the lube, the right kind of Lube for what I am cutting. For plastic that’s probably nothing. For brass, probably Rigid Nu-Clear or Tap-Cut, For Alu, WD-40, for Steel/Stainless Vipers Venom. The other trick is to do spring passes. Usually on the last few passes I’m only doing a thou, maybe half a thou. And I do spring passes between. Really helps me get solid finishes on my threads I find.
 
Golem Pens said:
Okay I am much happier with this. Self-ground HSS threading tool with minimal shoulder. Threading away from chuck.

Now I need to grind an internal bit...
Click to expand...
Hi Michael,
You are starting to get the hang of it ! Nicely ground HSS tooling makes a world of difference.
The threads and finish on that new piece look very much better !
 
Golem Pens said:
Okay I am much happier with this. Self-ground HSS threading tool with minimal shoulder. Threading away from chuck.
Click to expand...

The machining looks great, but I do have a question.

Screenshot_20260904_050803_Chrome.jpg

What is going on with that thread profile? Is that big flat top intentional? What does the internal thread to match that look like? A SusCAD hand sketch would do fine.
 
Susquatch said:
The machining looks great, but I do have a question.

View attachment 86361

What is going on with that thread profile? Is that big flat top intentional? What does the internal thread to match that look like? A SusCAD hand sketch would do fine.
Click to expand...
I just overshot the OD a bit. Threads in fine on the test plastic parts, but haven't made the corresponding brass part yet.

Guess I should make a v5 to really nail it... I'd like to eliminate the undercut too...
 
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