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How come the screw cannot fix the motor shaft to the joint?

Question asked by Peter Cohen on Jan 28, 2015
Latest reply on Feb 4, 2015 by Deepak Gupta

Hello, I am designing a circular joint to connect the motor shaft to another part. As you see from the photo, the motor shaft is of D-shape. It allows a screw to fix it to another part. I made a hole of M4 size and used a 3D printer to print the circular joint. Then, I used a tapper to create the screw thread. However, even I tried to tighten the screw, the circular joint does not rotate with the motor shaft. Anybody knows the reason and how to fix it?