Gallery, Projects and General > The Design Shop
UK machinist recommendation
AdeV:
--- Quote from: mike os on May 23, 2011, 05:12:09 AM ---So basically the rating ie either a lie or a con?... or both? :bugeye:
--- End quote ---
No, but you could say it was misleading.... a 30 metre watch would presumably pass a 30 metre static test (i.e. using a chamber, like the ones shown on this thread); but if you dived into a swimming pool with it, it's quite possible that the dynamic pressure (i.e. the instant pressure as it hits the water) could be significantly higher than the 30 mtr pressure.
As an example; consider when you drop something. It accelerates at 1G; but when it hits the floor; depending on how much the floor & obect deform, it could be decelerating at a rate in excess of 1000G, which is why so much stuff breaks when you drop it.
bry1975:
Some people actually say 30m means the watch is tested at 1metres depth for 30mins.
I will google the rating.
Regs
Bry
John Stevenson:
According to a Google the record for a free scuba dive is 330 metres or 1,000 odd feet.
After that you are in hard suits so a mickey mouse watch will work.
So one has to ask Why ?
bry1975:
Yep your correct deepest with a metal suit is something like 701Metres.
It's purely marketing with Rolex and IWCs some of the liquid filled watches can pass way beyond 5,000metres.
Jonny:
Might have a job for you Bry a 1974 Seiko orange face automatic unworking.
I would certainly look in to the tensile strengths of materials most notably the fixings and bump up the thread size accordingly.
Also have doubts anything off the shelf to connect the pump to would handle it. ie have sheared off the shelf steel 1/8"BSP hydraulic fittings rated at 10000psi at only 6300psi. Even filled with water and pumping in oil, it still goes smack.
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