Letter 39016

Want a visual Ra comparision chart  

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I am looking for a visual comparision chart for Ra surface finish values.

Gary Merkel
tool & die - Richfield, WI, USA

You will find comparator metallic plates. They can be either manufactured to your specs or according to vendor's standards in stainless steel, vacuum or galvanoformed.

Guillermo Marrufo
Monterrey, NL, Mexico

A visual "Ra" chart is going to be terribly subjective. Light reflection can be seriously different between straight line sanding and single point machining, grinding and dual action sanding, and blanchard grinding.

James Watts
- Navarre, Florida

McMaster-Carr will sell you a comparator sample plate, or any good tool supply company.

Jeffrey Holmes, CEF - Spartanburg, SC, USA

I agree with James from Florida. Your best bet is to just break down and buy either a surface gauge or profilometer. Way too many variables.

Brandt Hinton
- Elk River, MN, USA

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