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Roundness, multi-lobe

Roundness, multi-lobe Per ASME B1.7-2006 Definitions [ back to main page ]

Roundness, multi-lobe: (3 points at 120deg) half the difference between maximum and minimum variations in positions of one side of an equilateral triangle which envelopes the pitch cylinder, and the theoretical positions of that side as this enveloping triangle is rotated around the circumference of the pitch cylinder.  Term used in screw thread gaging practice.


Original Posting: 3/20/2012
Last Revision:
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