Hi, I don't understand the position evaluation. I have a program where the position of point B2 is evaluated. When I do the evaluation again in that program (without a new measurement) the results are different. Why? The position definition is still the same, I do the same thing 2 times, but the result is different each time. I am desperate..
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Matthew's explanation is a very brief description of one simple case. Position is not always a cylindrical tolerance zone, it can also be spherical or planar zone. Planar zone can have several different applications also - it can be the distance between two parallel planes, or two radial arcs. Matthew does mention the (M) modifier, which is Maximum Material Condition when applied to the considered feature(s), there is also (L) which is the Least Material Condition. To further complicate things, you can also have (M) or (L) applied to one or more datum, in which case it is the Maximum/Least Material Boundary and datum shift is allowed. I can not emphasize highly enough how important (and useful) training is for this subject. Hexagon has an Applied GD&T for PC-DMIS course that you'd undoubtedly find helpful. As for manuals you can read - take a look at the ASME and ISO standards but, be warned, they're not exactly an easy read.
Matthew's explanation is a very brief description of one simple case. Position is not always a cylindrical tolerance zone, it can also be spherical or planar zone. Planar zone can have several different applications also - it can be the distance between two parallel planes, or two radial arcs. Matthew does mention the (M) modifier, which is Maximum Material Condition when applied to the considered feature(s), there is also (L) which is the Least Material Condition. To further complicate things, you can also have (M) or (L) applied to one or more datum, in which case it is the Maximum/Least Material Boundary and datum shift is allowed. I can not emphasize highly enough how important (and useful) training is for this subject. Hexagon has an Applied GD&T for PC-DMIS course that you'd undoubtedly find helpful. As for manuals you can read - take a look at the ASME and ISO standards but, be warned, they're not exactly an easy read.
