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M6 x 0.75 LH metric thread

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Peter Simpson 310/06/2023 13:38:11
122 forum posts
2 photos

I need to make some M6 x 0.75 LH metric screws. Easy with the correct die, As these dies are like hens teeth. I looked to my imperial Colchester Bantam to cut the threads. As the lathe is new to me I'm not sure as to the change wheels and gear box lever positions to select to cut this metric thread. I have a full set of change wheels. Could somebody give me some advice on the correct lathe set up please.

Russell Eberhardt10/06/2023 14:43:03
avatar
2785 forum posts
87 photos

This little Windows program might help:

**LINK**

You just have to enter your leadscrew pitch and list all the change wheels you have and it will come up with a few suggested setups.

Russell

Nick Hughes10/06/2023 17:52:04
avatar
307 forum posts
150 photos

Have you checked out the replies to your earlier posing for a die supplier?

If not, have a look!

If you have and the replies are not suitable, then a reply stating this in that post, would be appreciated (at least by me).

Peter Simpson 310/06/2023 18:55:15
122 forum posts
2 photos

I purchased a die from China, not sure what quality it will be. This afternoon I set up the Colchester and cut a good M6 x 0.75 LH thread. So the die may be good to clean up the single point cut thread.

Emgee10/06/2023 19:40:48
2610 forum posts
312 photos

Cutwell sell Full Form inserts in most thread sizes, LH are listed, saves using a die to form the crests.

Emgee

Roger B11/06/2023 16:07:51
avatar
244 forum posts
105 photos

This a reasonable quality M6 x 0.75 LH die:

Round Dies, left, Mf, DIN 223 (DIN EN 22568), HSS-G, 6 x 0.75 » VÖLKEL SHOP (voelkel-shop.com)

£16.07, the devil is probably in the postage.

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