I want to cut a d shaped groove into the middle between the two circles to reduce weight, it needs to adapt if i change the offset on the circles to make the crank tapered. Thanks!
I'd suggest putting this D-shaped groove in the Part and then re-posting it so we can see what you're trying to do. Then someone should be able to give some suggestions about how to edit the sketch to make it parametric.
My thought would be to create a profile and path on the part and then use a swept cut.
Not exactly sure if this is what you were describing.
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