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Measuring surface finish on Circular Lay Pattern

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
2004

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

AF Kenton
retired business owner - Hatboro, Pennsylvania
2004

November 27, 2017

30941-1a

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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