I want to make an ER32 collet chuck for my Logan 922, but I'm pretty scared of threading 2 1/4 - 8 TPI into a blind hole when I cut the spindle threads into it.
I'd really like to run the lathe in reverse so I can cut the threads going out instead if in, but I've read horror stories of chucks unscrewing themselves. If I go easy on it and make sure my chuck is tight, do I need to worry about it?
If I DO need to worry about it, could I get around the problem by making a thin jam nut to put behind the chuck? I figure if I screw the jam nut in behind the chuck and then lock it and the chuck together really well, I might get by for one job.
Anyone tried this before?
This will be literally the second time I've tried cutting threads on a lathe. Third if I end up making a jam nut. The first try went very well, but it was an outside thread with good clearance and much slower feed.
I'd really like to run the lathe in reverse so I can cut the threads going out instead if in, but I've read horror stories of chucks unscrewing themselves. If I go easy on it and make sure my chuck is tight, do I need to worry about it?
If I DO need to worry about it, could I get around the problem by making a thin jam nut to put behind the chuck? I figure if I screw the jam nut in behind the chuck and then lock it and the chuck together really well, I might get by for one job.
Anyone tried this before?
This will be literally the second time I've tried cutting threads on a lathe. Third if I end up making a jam nut. The first try went very well, but it was an outside thread with good clearance and much slower feed.