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topic 30941

Measuring surface finish on Circular Lay Pattern

A discussion started in 2004 but continuing through 2017


Q. A 16 Ra finish with a circular lay pattern is specified on the drawing. What is the correct way to measure this finish. Should it be checked perpendicular to the centerline or in the circular lay pattern direction. This is AL, Alloy-T6.

The lay pattern is also Anodized.

Raj Bains
Manufacturing - Fremont, California, USA


A. Most measurement systems specify a number of or distance of peaks and valleys; therefore, that means across the grain of the pattern.

tony kenton
AF Kenton
Hatboro, Pennsylvania

November 27, 2017



Q. With respect to specifying the lay of a surface, which call-out should be used for measurement of the ground finish shown in the right image?

Obviously the pattern is radial, however measurement preference is from outside diameter toward center axis of the surface...not taking a radial measurement that would be concentric around the diameter.

Jason Velasquez
- Milwaukee, Wisconsin, USA

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