Re: Used Lift Clyinder

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Posted by TheOldHokie on March 19, 2019 at 07:52:00 [URL] [DELETE] :

In Reply to: Re: Used Lift Clyinder posted by Tim Daley(MI) on March 19, 2019 at 05:14:29:

"The cylinder blueprint bore finish spec is 80 Ám"

Yikes!! You sure about that? Aside from the fact that is a metric specification it's a rather rough finish.

I don't have a factory surface finish for the NAA cylinder in my notes but the surface finish for the piston o-ring groove was specified as 100Ra. No units specified but given place, time, application, and magnitude I would assume units to be in uin, e.g. equivalent to Ra = 2.54um.

Modern practice for reciprocating hydraulic cylinder bores is a surface finish of Ra = 4-20uin (.1-.4um).


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