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Self-Lock threads

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Michael Gilligan26/06/2021 07:44:16
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18923 forum posts
941 photos

Just stumbled across this page: **LINK**

https://www.emuge.com/content/self-lock-integrated-thread-locking-tools

… a very clever concept.

MichaelG.

.

Ref. https://www.emuge.com/sites/default/files/literature/EMUGE_2021_SELF-LOCK_Brochure-web.pdf

Edited By Michael Gilligan on 26/06/2021 07:47:38

DrDave26/06/2021 09:01:40
230 forum posts
46 photos

An interesting concept. Thanks for highlighting it.

Mick B126/06/2021 10:37:58
2018 forum posts
116 photos

Looks excellent for permanent assemblies, but what about those routinely dismantled for maintenance?

Mick B126/06/2021 10:37:58
2018 forum posts
116 photos

Doh. Duplicate post.

Edited By Mick B1 on 26/06/2021 10:39:14

Kiwi Bloke26/06/2021 10:39:39
609 forum posts
1 photos

This seems to be the same as the patented Spiralock (TM) (Detroit Tool Industries) thread form referred to in Harold R Vaughan's excellent book 'Rifle Accuracy Facts', published in 1998. I understand that it allows the load to be shared more equally by the engaged threads, but I'd have thought that it is applicable only to once-fitted assemblies, since, presumably, considerable plastic deformation occurs on tightening.

Vaughn used it to better secure a rifle barrel to the receiver, obtaining better mechanical integrity than a normal V-thread, allowing better transmission of barrel vibrations across the joint.

It doesn't seem to have caight on, or is it a well-kept secret?

noel shelley26/06/2021 11:22:09
758 forum posts
19 photos

I would be very wary of using this idea on stainless fastenings. Even when lubricated stainless can cold weld with serious consequences ! Noel.

John Reese02/07/2021 21:47:44
986 forum posts

It works similar to the Dardelet thread introduced in the 1930s.

Kiwi Bloke02/07/2021 21:59:36
609 forum posts
1 photos

Surprisingly few comments about this...

As I understand it, the thread carries its load on point contacts (in cross-section), rather than the thread flanks. Even if the load is spread across more 'points' than the first few flanks, surely the thread can't be as strong, when loaded highly, and retain its self-locking characteristic. And, in order to spread the load across more 'points', mustn't there be considerable deformation of the 'points' that first take the load? Is this elastic or plastic deformation? Isn't this effectively just a badly-fitting, interfering, thread? If it's so good, why isn't it more widely used?

Nigel Graham 202/07/2021 23:32:44
1706 forum posts
20 photos

Noel -

Oh yes, been there!

The risk may be reduced where other factors of the design allow, by using different grades of the steel against each other.

Raymond Anderson03/07/2021 05:12:21
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785 forum posts
152 photos

Emuge Franken, Top notch gear. Have quite a lot of their End mills Drills, Taps . Very spendy though. [ thankfully I get a good discount ] but cheaper in the long run. Only drills that can rival Titex. Interesting brochureyes.

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