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How to eliminate linear bearing noise?

How to eliminate linear bearing noise?

How to eliminate linear bearing noise?

(OP)
I have a reciprocating shaft running in two plain bearings (bushings).  The shaft reacts a moment and the bearing pressures are significant (2000 psi).  The shaft movement is about 5/16".  I have a 16 uin surface finish (I think) but the thing sounds like a zipper during shaft movement.  What surface finish will I need to eliminate the zipper sound?

RE: How to eliminate linear bearing noise?

For metal to metal bushings:  
Ra <= 0.0004 mm and Rz <= 0.003 mm.

When smooth running is of particular concern:
Ra <= 0.0003 mm and Rz <=0.002 mm.

RE: How to eliminate linear bearing noise?

(OP)
Many thanks!

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