## Datum Shift question

## Datum Shift question

(OP)

Folks

I am trying to find the max/min distance and I am not sure if this approach is the best one. Please doublecheck.. Lets assume the mating features are perpendicular so we can rule out any tilting and datum features dont need to be perpendicular, thats a new one..

Datum Shift, Line D, are we using the centerline approach for datum B. I didnt include all the parts in the stack path which i think i should.

thanks, appreciate the feedback

I am trying to find the max/min distance and I am not sure if this approach is the best one. Please doublecheck.. Lets assume the mating features are perpendicular so we can rule out any tilting and datum features dont need to be perpendicular, thats a new one..

Datum Shift, Line D, are we using the centerline approach for datum B. I didnt include all the parts in the stack path which i think i should.

thanks, appreciate the feedback

## RE: Datum Shift question

## RE: Datum Shift question

## RE: Datum Shift question

Here are two stack path. The ball is standard 1/16" diameter. I am doing reverse engineering. We know the max,min gap which is our design requirement. I am trying to design the washer dimensions from scratch. I opted for option 1 but i cant seem to position the parts at its minimum gap. At the maximum, the shaft touches the washer (see x). The balls always touch the wall cavity first. the washer (dimension E) and the shaft bottom never touch the wall. In option 1, two loops and two unknowns (C, H while F is known). But i also need to find dimension E. My question is do I account for the difference between the centerlines of the shaft(Dim F)-Dimension H which i dont know and will probably have a position feature frame. I seen stacks where they account for this delta. Equation 2 has two unknowns which can be tweaked by trial and error to meet the gap. I dont see any use for equation 1 unless to find C and then use it in equation 2 to find H?

I am afraid option 2 is incorrect because x1(xmax)is ignoring H and x2 has the wrong signs, it should be x2=D+G+H-A1-F. I dont know what to do, help

## RE: Datum Shift question

The equations don't make sense. E isn't in the path for X1 or X2.

## RE: Datum Shift question

thanks