I'm having trouble understanding what the roll dimensions are referring to
The drawing is showing that four roll or dowel or gauge pins are present and they all share the same 0.250" diameter. The 10° taper of the part makes taking a dependable and repeatable measurement difficult. So the gauge pins are used to ensure a consistent measurement.
This is actually a fairly common practice for tapered parts.
Basically, in order to measure the part after it is manufactured you would get 4 "rolls" (I assume that the industry that the drawing is used in would know what a roll is), place them where the drawing says to place them (looks like tangent to the 1.248 dimension) and then the height should be 2.285 +0.000/-0.018.
Thank yall so much!
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