Wringing gauge blocks together… in a vacuum

[Grindstone CowboyParticipant @grindstonecowboy]

Came across this video the other day which goes a long way towards explaining the forces involved in, and the reasons behind, the wringing effect.

A lot of the other videos by the same presenter are equally interesting and worth a look.

Links to https://www.youtube.com/watch?v=Z5XOk1oMFh0

Rob

Edited for typos and grammar

Edited By Grindstone Cowboy on 06/09/2021 22:33:40

[Grindstone CowboyParticipant @grindstonecowboy]

What causes the wringing effect?

[peak4Participant @peak4]

Don Bailey made a good introductory video to their history and use; check out many other videos from the same company.

 

Bill

Edited By peak4 on 07/09/2021 02:14:54

[Kiwi BlokeParticipant @kiwibloke62605]

I'm sure I've read that gauge blocks left wrung together become very hard to separate, and it's taught that it's bad to try to pull the blocks apart – they should always be slid apart. In both cases I believe that the surface can be microscopically damaged. I suspect that the microscopically thin oil film, which would be very difficult to remove, at a molecular level, and any trapped gas molecules act to make separation easier, by preventing cold welding-like effects. Surely inter-atomic or inter-molecular forces are responsible, when such welding-like behaviour occurs.

[Bo’sunParticipant @bosun58570]

From my trade school days with FMC, "inter-molecular cohesion" sounds familiar. Sorry, but it was a while ago, so any explanation has long gone. Probably into the corners of the workshop with all the dropped nuts, screws & washers.

[Author]

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