Sometimes i mate a part, move on but then it flips the mate. For example, I mate with a -20 deg. angle and then it flips to +20 deg. I fix it and then it repeats the flipping. SW2014.
What you could try is add a 20deg sketch to the part you're mating to and then use an end point and mate it coincident to the other part
Thanks, John. I most often mate to an assembly plane, but will try the sketch whenever possible. I am still wondering why it does that.
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