Raglan tailstock thread

[John BinghamParticipant @johnbingham85854]

Hi I am new today to the forum — I have a 5” raglan centre lathe and need to know the thread type an pitch for the tailstock nut looks like a 10tpi acme thread but not sure

Cheers john

[John BinghamParticipant @johnbingham85854]

Nut pitch

[Brian WoodParticipant @brianwood45127]

Hello John,

Welcome to the Forum belatedly, we seem to have missed your appearance here.

Maybe a Raglan owner can confirm, but I don't think it would be difficult for you to answer your own question. The pitch of the screw will be easy enough to measure with a ruler, remember to measure to the same feature on the thread, if it is ACME then the thread flanks will have a tapered flank angle of 27 degrees included angle..

The diameter is across the outside of the screw and the nut will have matching features to be able work as a nut

Regards

Brian

[Howard LewisParticipant @howardlewis46836]

Brian,

Sorry to contradict you, but Acme screw threads have a 29 degree angle. Have you caught my fat finger disease?

Howard

[Brian WoodParticipant @brianwood45127]

Hello Howard,

Thank you for putting me right, not so much fat fingers as a CPU failure from the neurone that controls these things!!

Brian

[not done it yetParticipant @notdoneityet]

No need to measure the thread for pitch. Just turn the handle a known number of turns while measuring the quill extension. Most leadscrews, other than the threading one, were square thread form on Raglans. Ask on the freeforums raglan machine tools forum, or I can check a L/J tailstock as they are likely to be much the same.

No real need for the thread form either, if you need to make a nut, I would think.  One made from delrin would likely  be adequate, cheap and easy to make.

Edited By not done it yet on 28/04/2018 12:46:42

[John BinghamParticipant @johnbingham85854]

Thanks all for the help and info I now have clarity am making a new tailstock screw and nut thanks again john

[not done it yetParticipant @notdoneityet]

John, it does not matter what threadform you choose if you are making both items. What was it, btw?

[John BinghamParticipant @johnbingham85854]

Sorry not familier with BTW thread form but thanks for your interest

[not done it yetParticipant @notdoneityet]

Btw – By The Way

[John BinghamParticipant @johnbingham85854]

Sorry a bit slow 1/2” dia 10 tpi l/h square thread

[Neil WyattModerator @neilwyatt]

Welcome to the forum, John.

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