Good stuff as always. I have a question, though... roughly 10:00 , the two versions shown, WHY are the 2.00 dimension BASIC? Am I missing something silly?
Great question! Most drawings have a standard profile control listed in the "Unless Otherwise Specified Tolerances" in the title block. This is sort of a "catch all tolerance" that you can use for some less critical features, however we still need basic dimensions to show the ideal locations of the features. So these 2 inch basic dimensions are identifying the ideal length of the flanges with respect to the datums, and the profile callout will define the tolerance.
At 7:30 using datum A on the larger flat surface controls 3 DOF and a datum B on the hole controls 2 DOF. Do you still need a third to control the 6th DOF? (I’ll call it the yaw rotation) I just ran into this on a drawing.
Another great question. You dont HAVE to. But if there were other features that you wished to control with respect to this 6th degree of freedom with respect to the DRF, you would likely need to rely on Simultaneous Requirements OR identify a tertiary feature, such as the surface being controlled with profile in this example.
great and insightful video as always
Thanks for the video!
Good stuff as always. I have a question, though... roughly 10:00 , the two versions shown, WHY are the 2.00 dimension BASIC? Am I missing something silly?
Great question! Most drawings have a standard profile control listed in the "Unless Otherwise Specified Tolerances" in the title block. This is sort of a "catch all tolerance" that you can use for some less critical features, however we still need basic dimensions to show the ideal locations of the features. So these 2 inch basic dimensions are identifying the ideal length of the flanges with respect to the datums, and the profile callout will define the tolerance.
At 7:30 using datum A on the larger flat surface controls 3 DOF and a datum B on the hole controls 2 DOF. Do you still need a third to control the 6th DOF? (I’ll call it the yaw rotation) I just ran into this on a drawing.
Another great question. You dont HAVE to. But if there were other features that you wished to control with respect to this 6th degree of freedom with respect to the DRF, you would likely need to rely on Simultaneous Requirements OR identify a tertiary feature, such as the surface being controlled with profile in this example.