I don't expect anyone to 'learn' plastic.
I expect them to learn set up on it, learn how a chuck works on it, turn the crank the wrong way on it, over run a thread on it, try a taper in it, learn to pick up Swarf without bleeding everywhere, learn to clean the ways without.ausing damage if you miss under the cross slide, learn to take deeper cuts without knocking the piece out of the chuck.
Then I expect them to move on to metal once they learn OUTSIDE OF THE DANGERS of Swarf in your face and a missing eye because you rubbed your eye with a shard on your glove.
I don't think some of you are remembering your first days.
The nephew went to a welding school where they read for two weeks about stuff before they could touch a machine.
That's about how many of you will remember high school shop class.
There's a reason for it.
I DO NOT believe in safety first. I believe in the job first.
This isn't a safety Sally bullshit diatribe.
This is a
I turned the lathe on, too fast, dug too deep and knocked out a tooth in my own head and one out of the lathe head when the thing I was turning popped out because I didn't know four chuck, I thought it was three chuck and self centered.
Diatribe.
Some of you have ran a lathe for 20 years. Please remember how to approach someone who hasn't ran one for 20 seconds.
NO ONE said to not move on to metal or to become a delrin expert.
It's safer to learn on.
That's all.
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I suspect you are taking too deep a cut toward the end of threading. I don't work in a production shop so I don't have to worry about how long the job takes. Unfortunately I'm the customer and I'm picky. Most of what I do is old tractor repair and not prototyping or anything very precise. When I need a say 1/2" stud I start with a 1/2" rod and turn the threads until they are sharp. I don't even pay much attention to depth of cut or anything like that. I do really cut back on my compound infeed when I get close however. Maybe .002" to .003" and no more. I use really sharp HSS for most threading as I find that carbide has a tendency to tear more. Just my observation so you may get good results with carbide. This usually results in a good thread with no tearing. Plenty of cutting fluid helps. As BobW said you are probably running too slow. It's natural to do this when you first start threading because you feel like you are going to screw something up if you go faster. Get some scrap to practice on and drive it like you stole it. When you get the hang of backing off of the compound at the end of the cut I think your threads will be smoother.
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