How to make a flat keyed shaft mate?

p3te_

How would I make a flat keyed shaft mate? Example: 0.25 inch shaft with a 0.2 inch flat on it, going into the keyed shape with a 0.05 inch offset. I use the cylindrical mate to constrain it to the appropriate axis, but how do I align the flats?

shashank_aarya

@p3te_I think planer mate is useful for above condition where you can define the limits. See the below GIF animation

For aligning the flat surfaces you need to chose default mate connector of key and shaft key way while giving planer mate.

traveler_hauptman

@p3te_ sounds like you want to fix the two parts relative to each other. Use a fastened mate instead of a cylindrical + X mate. https://cad.onshape.com/documents/373506f8c639f6e89fbcf4cb/w/cfc5e66b0c4d48fbcc99dfd5/e/33ba21f6031f429efc3eda16

Onshape mates are geared towards specifying the degrees of freedom between parts rather than the constraints between parts (two sides of the same coin) so you may have to adjust your mindset a little..