Pitch Diameter Gage Operation Manual
Models MRP 1500/2500/3500
Copyright © 2018 Gagemaker. All rights reserved
51
Operating Procedures for Internal Measurements
Inspecting Internal Parts
Materials Needed:
MRP gage
Inspection report
Part
Inspecting parts using the MRP involves placing the gage on a part in order to obtain a diameter reading
and an ovality reading. Ovality is the out-of-roundness of a piece of pipe or coupling. The average of the
largest and smallest readings, taken on the MRP, produces a “round” diameter reading. However, no
pipe is exactly round. So, the smallest reading subtracted from the largest reading produces the ovality
reading.
1. After zeroing the MRP gage on the standard,
place the gage on a box connector so the
wear pad rests on the face of the connector
and the pivot shoes ride on the crests of the
threads.
2. Ensure that the pivot shoes on the MRP gage
are properly positioned on the threads in the
part.
During inspection, the pivot shoes should
rest on full form threads, not black crested
threads. If necessary, re-adjust the
location of the pivot shoe until the gage
measures only full form threads.
!