bearing tolerances

A special section just for steam engines and boilers, as without these you may as well fit a sail.
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barts
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Re: bearing tolerances

Post by barts » Wed Oct 20, 2021 5:16 pm

I've used Delrin in valve gear bushings w/ very good success. I've not tried them yet on the crosshead. Otter has a tiny crosshead bearing ( 7/16" x 5/8" in the little end of the rod), the numbers work for static loading but I need to check the PV values. Perhaps not running that poor engine w/ 150 psi+ of steam pressure would help :) .

- Bart
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Bart Smaalders http://smaalders.net/barts Lopez Island, WA
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RNoe
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Re: bearing tolerances

Post by RNoe » Fri Oct 22, 2021 5:04 pm

Delrin (acetal resin) is one of my favorite materials for smaller bearings and sliding surfaces.
It likes to be contained so it cannot "creep" and move from its assigned location.

I have acquired small blocks of black Delrin impregnated with graphite. Even better.
'Have not tried to locate it commercially.
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Re: bearing tolerances

Post by ivan the terrible » Mon Oct 25, 2021 6:46 pm

thanks for all your comments some good advice and observations there, but I can actually see play in the mains and the big end's so will eventually dig in deeper as I say luckily Stuart's are about 1 hours drive from me so can make sure stuff is right before I buy 😊
warning may be grumpy :lol: 8-)
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