That thread looks fine in more ways than one.
What did you use?
Have you tried it yet?
John
Thanks John - The thread was cut using a "laydown" threading insert. It is a 1.0 metric pitch.
I used it today to cut a collet a friend had made for a .50 bullet puller he is building. The collet grabs the case around the extraction groove.
Between centers - good man. I use a pointy stick in the chuck, marked for #0 so it goes in the same way each time. The dog leans up against one of the jaws. Much easier/quicker than mounting a faceplate and a much better choice than using the chuck as a chuck on one end.
I present my shiny new threading bar. And the lack of adjustable dials on the mill/drill bit me again on the setscrews.. "was that two turns plus 78, or..?"
No matter, it's a rock solid 3/4" bar. Even at a 5" stickout there wasn't a hint of chatter. The last image is the finished thread. This was done on a horizontal mill using the .050" feed (for 20 TPI) and plunging .005" straight in for each pass. The last two passes were spring cuts.
I like it, home made tool threads are always the best!
(03-05-2016, 10:47 AM)Sunset Machine Wrote: [ -> ]Between centers - good man. I use a pointy stick in the chuck, marked for #0 so it goes in the same way each time. The dog leans up against one of the jaws. Much easier/quicker than mounting a faceplate and a much better choice than using the chuck as a chuck on one end.
One should still take a clean-up cut on the center before turning in between centers. I'm sure your method is close, but there are times when close is not good enough.
Technically, of course. But I've put a dial on it, dead steady. That's why it's marked for 0. If I were concerned, I'd do exactly what you suggest before I'd bother with a faceplate and hard center. That gets OLD quick.
Darren , nicely done mate
Rob
Yep, nicely done Darren
DaveH
I used the same setup as you Sunshine.
Sunshine. <chuckle> That's what we call smart-asses. I might have deserved that, but you did say "the first time". Many put a center pop in and bring it out to the tailstock, still using the chuck and forcing the work into place. It seems innocent enough, sometimes unavoidable, but.
Mind a little remark? Your external thread looks rough. I can't tell from the pic if the tool rubbed, dull, or if the threads just need to be dusted. A wire brush and emery looked like they might help. Or maybe I should find my glasses.