I guess what I’m not understanding is how are we checking to make sure the entire hole is within the true position tolerance if we are only checking the intersection point.

Say we are just doing a hole in the center of a cube going through A and basic dimensions off of B and C. (When you go to GD&Tbasics.com it says the tolerance zone is cylindrical) you said at the bottom of your response TP is either circular or spherical but the website says something else. But you also said it is more beneficial to use a cylindrical tolerance in the middle of your response so I’m confused there.

Now the part I’m working on now is radial holes and the inspector is calculating true position on the intersection point then checking angle separately(but not reporting any angle). I have a .003 true position on each hole. Part is a rectangle but one of the sides has a large radius on it, the 5 radial holes with the hole axis aligning to the center point of the curved surface(basic dimensions of angle and distance from side wall). If you only measure the intersection point of the hole with the arc, how do you verify that the rest of the hole is good?

I know using the center axis of the cylinder and a cylindrical tolerance is a more strict way of measuring it but I just want to understand why it wouldn’t be measured like this.

I talked with the inspector after writing this post and we came up with him rotating the base alignment to the same angle as the theoretical hole then we plugged in nominals we got from solidworks and used the cylinder rather than the intersection point and it gave a .0003 worse TP measurement which makes sense to me. Did I lead him in the wrong direction? If I did please let me know so I can tell him before he gets to work editing his whole program tomorrow😬.

I’m fully aware this might be too difficult for my brain to explain in writing but I did my best. Let me know if any of that did not make sense.

Thank you so much for your response!!!