Just F.Y.I. ASME Y14.5M Para 2.9 "screw threads" states that "Each tolerance of orientation or position and datum reference specified for a screw thread applies to the axis of the thread derived from the pitch cylinder" Check out
http://trueprecisioncorp.com/ to find a good pitch micrometer. We use these pitch micrometers to accurately measure pitch cylinder size...they work like a charm and you can manually input actual size for MMC calculations if so desired.
Just F.Y.I. ASME Y14.5M Para 2.9 "screw threads" states that "Each tolerance of orientation or position and datum reference specified for a screw thread applies to the axis of the thread derived from the pitch cylinder" Check out
http://trueprecisioncorp.com/ to find a good pitch micrometer. We use these pitch micrometers to accurately measure pitch cylinder size...they work like a charm and you can manually input actual size for MMC calculations if so desired.
