Spurs
Mechanical
- Nov 7, 2002
- 297
I am wondering how to do the GD&T callout on my drawing to achieve the following result using an attribute gage:
I have a bolt circle of 2 inches in diameter with 5 studs in the bolt circle equally radially spaced. The studs have a diameter of .250 +/- .005"
There is a hole in the center of the studs of .200" +/- .003" - labeled datum A. Datum B is the face that the studs are attached to.
For proper function of this device, each stud can be radially spaced at 1" +/- .004" from the center of .200" hole. Of course the angle between each stud is a basic dimension of 72 degrees. The tolerance on this is +/- 0 degrees except for a bonus if the stud is not at the maximum material condition. There is an additional bonus possible if the center hole is not at maximum material condition
How do I call this feature control frame for true position on the drawing?
What confuses me is that the true position of the studs really do not have a diameter tolerance zone. The tolerance zone is strictly radial from the center with bonus on angular postion if the studs are not at maximum material conditon. Hence the attribute gage has oval shaped holes for each pin to go through.
Can anyone enlighten me?
I have a bolt circle of 2 inches in diameter with 5 studs in the bolt circle equally radially spaced. The studs have a diameter of .250 +/- .005"
There is a hole in the center of the studs of .200" +/- .003" - labeled datum A. Datum B is the face that the studs are attached to.
For proper function of this device, each stud can be radially spaced at 1" +/- .004" from the center of .200" hole. Of course the angle between each stud is a basic dimension of 72 degrees. The tolerance on this is +/- 0 degrees except for a bonus if the stud is not at the maximum material condition. There is an additional bonus possible if the center hole is not at maximum material condition
How do I call this feature control frame for true position on the drawing?
What confuses me is that the true position of the studs really do not have a diameter tolerance zone. The tolerance zone is strictly radial from the center with bonus on angular postion if the studs are not at maximum material conditon. Hence the attribute gage has oval shaped holes for each pin to go through.
Can anyone enlighten me?
