Principles of Dimensioning Engineering Design

How to write two dimension of a slot or rectangle? slot dimensioning dimension which is the difference between the upper and lower limits The tolerance of the slot in Figure is 004 and the tolerance of the mating part is slot promo My crappy work around for dimensioning slots without centerlines is to dimension to the midpoint of the line and the center of the radii

slot online forum I'm working on a part where there are numerous slots, all alike In the part document, I created one slot and then used a linear feature