Lock nuts: the engineer's view

[sarabande]

I am fascinated by experts, and here's a web site with lots of info about bolts and nuts, and especially on the proper way to use lock nuts.

With phrases like "axial backlash" and "Junker transverse vibration test" in the text, and discussion on thread types and bolt failure reasons, I have spent a happy hour.

http://www.boltscience.com/pages/info.htm

 

[vyv_cox]

That's a very interesting page. At one time in my professional life I used to see many failed bolts and took quite an interest in them. I worked quite regularly with this company https://www.rotabolt.co.uk/ before it was bought out by James Walker, who I also worked with on elastomeric seals.

 

[doug748]

With phrases like .... "Junker transverse vibration test" in the text........ [/QUOTE] Old Junker could h...nd bought a Norton Dominator mobile test rig.

 

[JohnGC]

Thanks. Interesting reading.

 

[Skylark]

I am fascinated by experts, and here's a web site with lots of info about bolts and nuts, and especially on the proper way to use lock nuts.

With phrases like "axial backlash" and "Junker transverse vibration test" in the text, and discussion on thread types and bolt failure reasons, I have spent a happy hour.

http://www.boltscience.com/pages/info.htm

Before retirement I worked for a manufacture of special purpose automotive gearboxes and our engineering manager worked with these guys and had good things to say about them. There are many similar ways to spend a happy hour if you’re so inclined. Bearing manufacturers provide an outstanding level of support as do seal manufacturers. I was always of the opinion that Loctite was snake oil until I engaged with Henkel.

 

[colhel]

I still don't know what a "Machine Screw" is though . But i'm pleased he hasn't mentioned it :encouragement:

 

[Topcat47]

Ahh! What joy! An esoteric engineering question. A machine screw is threaded all the way to the head. A bolt has a plain shank. Simples chi!

 

[colhel]

A screw and a bolt then. But machine screw?

 

[Daydreamer]

Ahh! What joy! An esoteric engineering question. A machine screw is threaded all the way to the head. A bolt has a plain shank. Simples chi!

sshoooo. (sharp intake of breath)

 

[Topcat47]

A screw and a bolt then. But machine screw?

In the bad old days, screws were always "woodscrews". When old man Whitworth came along, bolts and "Machine Screws" were made in lathes to engineering tolerances. Common usage has lost the "machine" and hence you often find screws in B&Q labelled "woodscrews", just in case anyone was tempted to try to use them in metal.

 

[JohnGC]

Ahh! What joy! An esoteric engineering question. A machine screw is threaded all the way to the head. A bolt has a plain shank. Simples chi!

That's what I thought; it seems we are out of date.

http://www.boltscience.com/pages/faq.htm#14

 

[penberth3]

...hence you often find screws in B&Q labelled "woodscrews", just in case anyone was tempted to try to use them in metal.

But... self-tapping screws (for metal) do work in wood!

 

[Lon nan Gruagach]

But... self-tapping screws (for metal) do work in wood!

Not only do they work, but you can put them in with a hammer.

Oops, wrong thread.

Ahahahhaaaaaaa, see what I did there..

 

[JohnGC]

Not only do they work, but you can put them in with a hammer.

Oops, wrong thread.

Ahahahhaaaaaaa, see what I did there..

I reckon you've a screw loose.

Mind you, I can't torque.

 

[2Tizwoz]

For as long as I can remember this has been a machine screw.

You can use them in wood, but the wood has to be tapped.

 

[NormanB]

That's a very interesting page. At one time in my professional life I used to see many failed bolts and took quite an interest in them. I worked quite regularly with this company https://www.rotabolt.co.uk/ before it was bought out by James Walker, who I also worked with on elastomeric seals.

I remember seeing Rotobolts on Tomorrow’s World and going in to see my boss the next day, suggesting we should trial them on an application we were having trouble with. The trial was a great success but I had moved on before they were generally put into service. A great ‘invention’ and like all these things - why didn’t I think of that.

Updated Link: https://www.expressandstar.com/busi...s-to-see-new-rotabolt-plant-in-black-country/

 

[Lon nan Gruagach]

For as long as I can remember View attachment 66695this has been a machine screw.

You can use them in wood, but the wood has to be tapped.

 

[Norman_E]

Old Junker could have saved himself the bother and bought a Norton Dominator mobile test rig.

Or my BSA Spitfire!, or indeed any old parallel twin.

 

[PuffTheMagicDragon]

But... self-tapping screws (for metal) do work in wood!

Even better, stainless self-tappers are much less expensive than stainless woodscrews.

 

[Dan Tribe]

Old Junker could have saved himself the bother and bought a Norton Dominator mobile test rig.

That might explain why my girlfriend enjoyed riding with me.