I need to make some special fittings to allow rotation between parts aprox 1/2" dia. with normal water pressure (Max 75 psi). How would you machine the groove if it were on the od of the piece or if it were on the face of a flange surface? How critical are the dimensions at these conditions?
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Originally posted by BoucherI need to make some special fittings to allow rotation between parts aprox 1/2" dia. with normal water pressure (Max 75 psi). How would you machine the groove if it were on the od of the piece or if it were on the face of a flange surface? How critical are the dimensions at these conditions?
Groove dimensions aren't super critical at low pressures, holding .005 tolerances is pretty easy w/ a lathe bit ground to the right size. Clearance
between rubbing parts should be small - no more than .003" or so, or
the O-ring gets squeezed into the gap.
Keep in mind the consequences of failure vs cost of perfection; a leak in a lawn sprinkler is less critical than a computer water cooling system :-).
http://www.efunda.com/designstandard...ring_intro.cfm
- BartBart Smaalders
http://smaalders.net/barts
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