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Re: Threading for the first time

Jim Dunmyer
 

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Charlie,
The others have given you great advice on threading, so jump in and give it a try. Be sure to have a suitable nut on hand to check the thread when you get ¡°close¡±. In addition to the tips from the others, I¡¯ll offer these two: file or turn a bevel on the LH end of the part before beginning, and run a file over the top of the threads for just a bit when you¡¯re done. Be certain that the part is clean when you are checking it with the nut, so a burr or small particle doesn¡¯t throw you off.
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The hand crank is VERY useful on these little lathes, as they turn pretty fast for threading. At least for my old, slow reflexes. I do nearly all my threading on my LeBlond, which runs as slow as 20 RPM. ¡°Third¡± speed is only 40 RPM on that machine, and that¡¯s about as fast as I¡¯ve ever run it while threading.
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My original cover screws have the head recessed in deep counterbores in the cover, so it wasn¡¯t easy to do what Mert did with his. Instead, I cut off an Allen wrench and pressed the piece into a turned & knurled brass knob. This makes it quite easy to spin those bolts out or in.
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Another way to get around this sort of problem is to cut the head off a suitable screw and silver solder it into an extension that you¡¯ve made.
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From: CLevinski
Sent: Wednesday, December 05, 2012 7:57 AM
Subject: [7x12minilathe] Threading for the first time
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Hi, All,

I'm going to try single-point threading for the first time. I've read up on the procedure, and I figure the best way is to just jump in and give it a try. I'll initially make a 3/8-24 thread, only because it's big enough for me to really see the progress as it develops. But what I would really like to make for use after that is a 5 mm thread. These are, I believe, a 0.8 mm pitch. My goal is to make some thumbscrews to hold the gear cover on my lathe without having to use a hex key to get it off. My question is whether this is too fine a thread for me to do as a beginner? Are there any special tricks?

I guess it really doesn't matter; if I screw it up (pun intended), I'll just try it again.

Thanks,
Charlie
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