Threading away from shoulder is a better idea
I dislike adding springs on the compound, its an extra thing that could move/chatter and give inaccuracies, and I dont have compound attached very often.
Which means running to the shoulder, stopping, advancing to last cut plus cut, then starting. I must try it sometime. Will need a 3 phase motor for my old Triumph first..Thread cutting away from a shoulder is fine if you've got all your backlash taken up otherwise you're going to dig in. Probably OK, not guaranteed.
Someone over at PM (I think Ray from Ohio) rigged up an air cylinder to do the retract.
Yup, and some also have a single-tooth clutch running at spindle speed for the feeds/threads gearbox that trips on a micrometer stop - wish mine had, but if I ever get the Tuits I have a cunning plan... For threading, the feeds already have a trip on a stop!Holbrook has quick retract as standard
I have cat like reflexes to be able to retract quick , built up by making hydraulic cylinders on piece work
Had....Holbrook has quick retract as standard
I have cat like reflexes to be able to retract quick , built up by making hydraulic cylinders on piece work
Stops without retract equal broken tips!Yup, and some also have a single-tooth clutch running at spindle speed for the feeds/threads gearbox that trips on a micrometer stop - wish mine had, but if I ever get the Tuits I have a cunning plan... For threading, the feeds already have a trip on a stop!
Which is why my Holbrook has a quick-retract lever and I use it... and the threading tool cuts its own run-out groove if you're blessed with the single-tooth clutch, it's bloody accurate!Stops without retract equal broken tips!
I bet you never haveWhich is why my Holbrook has a quick-retract lever and I use it... and the threading tool cuts its own run-out groove if you're blessed with the single-tooth clutch, it's bloody accurate!
The Model C doesn't have the single-tootch clutch, but I use the micrometer stops on the feed a lot, bloody handy and accurate to a few tenths... Is yours knackered and sloppy, then?I bet you never have
Everything has limitations.There are some limitations on a quick retract when threading to a shoulder. If you were threading 1/2" diameter up to a 4" diameter shoulder, it would be a challenge to make it work.
Straight cut with insertsTakes away the ability to tilt the top slide to the angle of the thread, so you cut on both sides as you advance cuts?
Not that I'm any thread cutting expert...