Thank you gentlemen!
The table itself was easy, by comparison!
This threading exercise has got me thinking about it still.
Here's one idea I'm wondering about:
Now I used the cutting method where the topslide is set over to the half angle. Ostensibly that reduces the wedging action of the cutter for our smaller lathes, and allows them to cut on the leading edge of the cutter and the tip (in an acme thread).
I was using a turned cutter profile. It has no relief under that forward edge. And the interior groove it is cutting presumably bears hard against that lack of relief, since the angle of the thread goes aft and under the cutter. Relief here would need to be pretty steep to even just parallel the thread edge.
The topslide was set over 14-1/2 degrees towards the headstock -- because you gradually withdraw the topslide to cut the thread.
Now what would happen if I had angled the topslide the same amount but in the opposite direction? Wouldn't that cut easier, because the trailing edge presents the opposite situation -- automatic relief in relation to the square cutter edge? Can you cut on the back side of a threading tool vs the front?
questions, questions........
