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I use Autodesk Inventor 2016 (I'm trying to draw a Wankel engine) I have a (blue) large internal gear that revolves around a stationary (green) small normal gear. It works fine and the teeth mesh. I also created a (red) square block with a hole in it that has the same diameter as the outer diameter of the (blue)internal gear. I used the "insert constraint" to attach the (red) square block to the (blue) internal gear. Now the square block and the internal gear revolve around the small gear. There is only 1 problem : the internal gear rotates within the square block. North, south, west and east of the square block never changes... I would like the square block to turn with the internal gear. The square block should be fixed on the internal gear and move exactly the way the internal gear moves... I tried using "mate constraint" between the internal gear and the square block, but I always get an error message "The assembly cannot be solved" I tried an "angle constraint" between the side of the square block and a side of one of the teeth of the internal gear which also results in an error. I tried nearly everything I could think of. The principle I want to create is that of a Wankel engine. The specs of the internal and small gear are : small gear gear ratio : 1,5 Module : 2,75 Center Distance : 17,5 #teeth : 26 ul internal gear gear ratio : 1,5 Module : 2,75 Center Distance : 17,5 #teeth : 39 ul I used a "mate constraint" between : z-axis of small gear and z-axis of assembly centerpoint of small gear and centerpoint of assembly YZPlane of small gear and YZplane of assembly Is there anyone who has an idea to fix this problem ?