i was measuring an oring groove that by calipers measured 0.645 the arm measured a plane to plane measurment of 0.234 i measured a plane at the top of the groove and a plane at the bottom of the groove and measured the distance between the two in 3d and that is number i got however all other dimensions i took using the same set up and alignment came out correct .
You can’t measure the distance between 2 planes and get an accurate reading because planes are infinite (they go on forever) and no 2 planes are exactly parallel to each other. The most you will get is a best fit as the CMM tries to find the closer or larger distance between.
Better to level and origin to one surface and then from there measure profile of points taken on the other surface. Recall the points and tolerance them accordingly.
You can’t measure the distance between 2 planes and get an accurate reading because planes are infinite (they go on forever) and no 2 planes are exactly parallel to each other. The most you will get is a best fit as the CMM tries to find the closer or larger distance between.
Better to level and origin to one surface and then from there measure profile of points taken on the other surface. Recall the points and tolerance them accordingly.
