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Machining range for 3.2 Ra

April 10, 2008

Dear sir,

I have a drawing showing the machining as 3.2Ra . When I checked with instrument I am getting all less than 2.0Ra. Drawing doesn't specify a range . Kindly let me know what is the range acceptable and in which standard this is mentioned

Waiting for the reply.

Jeejo Nair
SNC - UAE

I have never heard of anyone complaining about getting a better, smoother surface finish than they specified. I would take the spec as a minimum acceptable.

AF Kenton
retired business owner - Hatboro, Pennsylvania
April 11, 2008

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