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Sieg C6 Lathe new threading possibilities

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Ron VOS03/05/2023 01:34:36
1 forum posts

Hello everyone.

My name is Ron.

i have a sieg sc6 metal lathe and need to cut metric thread on shafts of an approx 30/35 mm diameter

I do have all the gears and downloaded screw cutting chart from this topic.

I never done threads before so would be very great full for any help please

thank you

ron

Thor 🇳🇴03/05/2023 07:25:23
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1766 forum posts
46 photos

Hi Ron,

Welcome to the forum. There are many books about the subject, like "Screwcutting in the Lathe (Workshop Practice series #3), and videos:

that may be of help.

Thor

Edited By Thor 🇳🇴 on 03/05/2023 07:26:01

RobCox03/05/2023 08:57:25
82 forum posts
44 photos

Hi Ron,

The best advice I could give would be to start on some easy to cut scrap first, ally or delrin. Do lots of practice with a standard thread size (M12?) so you've got a nut to judge when the thread is deep enough.

If you're cutting a 30mm dia thread, what's the pitch? I did a M33 x 3.5 thread on a minilathe once but it's less straightforward than plunging straight in as the large thread depth and the low power of the lathe are somewhat at odds with each other.

You might consider some thread wires to check the thread, so you know when its right or how much needs to come off, once you're comfortable with the screwcutting process. Again, practice makes perfect here too, even though theyre fiddly to use at first.

Good luck with it, Rob

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