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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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What is reasonable Rz finish on stainless steel roller?
I have a print on a stainless steel roller (304 HQ Stainless Steel). The finish call out is Rz=16µm. Tolerance on the diameters is ± .001 inch. Does this finish seem reasonable? To me it seems to be quite rough based on the print specifications.
Craig Outlandimporter of automotive components - Bloomfield Hills, MI USA
January 19, 2010
Keep in mind that Rz is the peak-to-valley height, and not the average roughness (Ra) that is more commonly known. Rz can be up to 10x higher than the Ra measurement for a given part. Having said that, Rz 16 sounds a little high to me, especially if the part is supposed to be ground on that surface. Grinding should produce Rz 6 or less.
Toby PadfieldAutomotive components supplier - MI, USA
January 22, 2010
Are you sure the about the units, Mr. Outland? A basic rule for engineering drawings is to use only one unit system. The diameter tolerance is in inches whereas the surface roughness is metric. Could it be 16 microinches instead?
Guillermo MarrufoMonterrey, NL, Mexico
January 30, 2010
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