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how to measure flatness of coated metal

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APH

APH

Mechanical
Joined
Sep 7, 2004
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79
Location
US
What is the cheapest and fastest way to find out if my coated surface is flat. The plate is coated all around, so I can't use one side for reference.

Thanks
APH
 
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The surface of the coating or of the substrate?

TTFN
 
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Just measure the coat thikness using a coat gage (Transcat.com or davis instruments)
 
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How flat?

Not too flat - Put a thin coat of liquid on it like water on a flat roof.

Pretty flat (0.001") - like a saw blade - use a straight edge and a light source behind it

Really flat - reflected laser light

 
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