i am not able to give a surface constraints between to tooth surface of gear and pinion in assembly mode,i used a stp file as a reference converted to part file

i am trying to make a assembly with a pinion and gear, mounting distance and offset is set as per requirement, but i am not able to create a surface to surface constraints between tooth profiles of gear and pinion.

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If you're using Kinematics, just setup a Gear Joint between the two parts.

If you're not using Kinematics and only working with Assembly Design, than I would add the pitch diameter circles to both gears and constrain the circles tangent to each other. The tooth profile geometry is too complex to build constrains off of.

 
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