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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position is a cylindrical tolerance zone surrounding the nominal location & vector
A hole (circle) with a vector of 0,0,1 (square to the Z axis) will have deviations in the X and Y axis.
If a hole is 0.5mm off in X and 0.25mm of in Y, then it is .559mm away (RADIALLY) from the nominal location.
The POSITION is toleranced and reported as a DIAMETER.
So the reported position of this example is 1.118mm.
This is the diameter (or cylinder) needed for the hole to be IN TOLERANCE which is then compared to the tolerance. If the position tolerance is only 1mm, then it is out of tolerance.
Then there is the (M) condition of the tolerance. If included, you get to add to the position tolerance the amount the hole SIZE is bigger than the minimum allowed hole size BUT NOT MORE THAN the maximum allowed hole size.
So, hole SIZE is 10mm, +/-0.25mm
The minimum hole size is then 9.75mm and the maximum size is 10.25, maximum bonus tolerance would be 0.5 if the hole is 10.25mm
If the hole SIZE checks 10.1mm, then there will be 0.35mm of 'bonus' tolerance for the hole, giving a total position tolerance of 1.35, and the 1.118 is smaller than that, so it would be in tolerance.
position is a cylindrical tolerance zone surrounding the nominal location & vector
A hole (circle) with a vector of 0,0,1 (square to the Z axis) will have deviations in the X and Y axis.
If a hole is 0.5mm off in X and 0.25mm of in Y, then it is .559mm away (RADIALLY) from the nominal location.
The POSITION is toleranced and reported as a DIAMETER.
So the reported position of this example is 1.118mm.
This is the diameter (or cylinder) needed for the hole to be IN TOLERANCE which is then compared to the tolerance. If the position tolerance is only 1mm, then it is out of tolerance.
Then there is the (M) condition of the tolerance. If included, you get to add to the position tolerance the amount the hole SIZE is bigger than the minimum allowed hole size BUT NOT MORE THAN the maximum allowed hole size.
So, hole SIZE is 10mm, +/-0.25mm
The minimum hole size is then 9.75mm and the maximum size is 10.25, maximum bonus tolerance would be 0.5 if the hole is 10.25mm
If the hole SIZE checks 10.1mm, then there will be 0.35mm of 'bonus' tolerance for the hole, giving a total position tolerance of 1.35, and the 1.118 is smaller than that, so it would be in tolerance.
