Your Products have been synced, click here to refresh
Also, please explain the criteria for reporting diametric TP when there are THREE basics controlling it's location. I am not asking because I know the answer and want to crack on you. I am asking because I know what I do and want to see what others do.
If the FCF calls out three datums and one is the surface that the hole is normal to, then the axis of the hole (cylinder) must be within the TP tolerance zone. Based on ANSI Y14.5 you CANNOT just verify a point projected into the plane.
Forget the CMM. Put a pin into the hole. As close as you can to where the pin enters the part indicate its position to the basic dimensions that control it's 2d location. Now, indicate the it's position on the opposite side as close to that surface (or move away from the surface the a distance equal to the depth of the hole.) You must maintain the TP tolerance at both those locations.
In other words, you have to evaluate the AXIS of the cylinder, not just the center of it at one surface. This is just another way of controlling perpendicularity.
I think I am agreeing with CMMGUY and VPT here.....
Also, please explain the criteria for reporting diametric TP when there are THREE basics controlling it's location. I am not asking because I know the answer and want to crack on you. I am asking because I know what I do and want to see what others do.
If the FCF calls out three datums and one is the surface that the hole is normal to, then the axis of the hole (cylinder) must be within the TP tolerance zone. Based on ANSI Y14.5 you CANNOT just verify a point projected into the plane.
Forget the CMM. Put a pin into the hole. As close as you can to where the pin enters the part indicate its position to the basic dimensions that control it's 2d location. Now, indicate the it's position on the opposite side as close to that surface (or move away from the surface the a distance equal to the depth of the hole.) You must maintain the TP tolerance at both those locations.
In other words, you have to evaluate the AXIS of the cylinder, not just the center of it at one surface. This is just another way of controlling perpendicularity.
I think I am agreeing with CMMGUY and VPT here.....
© 2024 Hexagon AB and/or its subsidiaries. | Privacy Policy | Cloud Services Agreement |