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.
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.