sgr41 Posted December 20, 2020 Report Share Posted December 20, 2020 Hello Everyone, I wanted to know how I can calculate the interference (shrink fit) needed for a shaft and propeller if I know the dimensions, material, speed and torque. Thanks for any help you can provide. Quote Link to comment Share on other sites More sharing options...
DrD Posted December 20, 2020 Report Share Posted December 20, 2020 Get a reasonable value for the coefficient of friction, and calculate the interface pressure required to transmit the required torque. After you know the interface pressure, the interference is pretty easy. Check out a machine design book (Shigley, Budinas, or other) for the details. DrD sgr41 1 Quote Link to comment Share on other sites More sharing options...
sgr41 Posted December 20, 2020 Author Report Share Posted December 20, 2020 Thank you very much Quote Link to comment Share on other sites More sharing options...
sgr41 Posted December 20, 2020 Author Report Share Posted December 20, 2020 21 minutes ago, DrD said: Get a reasonable value for the coefficient of friction, and calculate the interface pressure required to transmit the required torque. After you know the interface pressure, the interference is pretty easy. Check out a machine design book (Shigley, Budinas, or other) for the details. DrD Thank you for the answer. According to the book the formula for the pressure is I need to find the value of delta(radial interference). Which formula do I use to calculate the pressure, assuming I know the torque of the motor, coefficient of friction and shaft diameter. Quote Link to comment Share on other sites More sharing options...
DrD Posted December 22, 2020 Report Share Posted December 22, 2020 Do you know the meaning of the symbols in the equation you quoted? If so, please list them (if not, please look them up). Then, do you know how to relate force to pressure and area? (What area does the pressure act upon?) Can you see how to go from here? DrD Quote Link to comment Share on other sites More sharing options...
sgr41 Posted December 22, 2020 Author Report Share Posted December 22, 2020 Yes I know the meaning of the symbols. I am guessing it goes as follows then: F=PA Then Frictional force Fr, Fr=F*u(coefficient of friction) Finally, Max Torque(T)= F*d/2 Please correct me if I am wrong. Quote Link to comment Share on other sites More sharing options...
DrD Posted January 8, 2021 Report Share Posted January 8, 2021 Looks like you are on the track. DrD sgr41 1 Quote Link to comment Share on other sites More sharing options...
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