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  1. SR71-110

    sizing a motor

    Hi, I tried finding the torque for the motor, just want to make sure if this makes sense. The wheel is being pushed to the drum with a force, the drum is 3-4 times bigger in diameter compared to the wheel. I did T= F*perpendicular distance. I am using the radius of the drum, because the wheel...
  2. SR71-110

    Torsion on shaft with square end

    There is a groove between the square and the shaft as a means for transition to smaller diameter. You are correct, this groove will be my high stress area. You are correct, I am after the failure of the system because of the groove. Do I just need to do Torsion calculation? how can I do that...
  3. SR71-110

    Choosing a brake for multiple wheel system

    @dvd Thank you for your feedback. I think DIN EN 12532 is the closest standard. Only think different is the brake addition to generate tractive force. Only the drum is driven which drives the wheel, I need the brake applied to the wheel to generate a tractive force. I will be working with this I...
  4. SR71-110

    Choosing a brake for multiple wheel system

    @dvd Yes, I searched for it, but I couldn't find anything about brakes. did you say Vfd or vid? on a drive motor? I am not sure if I understood. Are you implying that a brake can be used in conjunction with the drive motor? I am powering the drum with the motor which turns the wheels.
  5. SR71-110

    Choosing a brake for multiple wheel system

    It's for testing wheels of different sizes, tested on a rotating drum (WHEEL ENDURANCE TESTING). To find the slippage in the x direction where the wheel contacts the drum
  6. SR71-110

    Torsion on shaft with square end

    It is a result of smaller diameter.
  7. SR71-110

    Choosing a brake for multiple wheel system

    Hi All, A quick question about Brakes, if I need to use one brake for different size wheels. Is it feasible? If yes, if anyone can guide me in the right direction, I would really appreciate it. Thank you.
  8. SR71-110

    sizing a motor

    Hi All, I have to size a motor for a rotary device (a drum). The drum has a normal force applied to it. What would be the best way to size a motor for such a system? Thank you.
  9. SR71-110

    Torsion on shaft with square end

    Hi desertfox, Thank you for your reply. It's all one piece, it has a groove and fillets that look like welds.
  10. SR71-110

    Difference between rubber testing

    Hi All, I have a quick question regarding rubber testing. Is it correct to compare Tear strength tests from ISO and ASTM between ISO 34-1 Method A and ASTMD624 Die C? Are they the same? Thank you :)
  11. SR71-110

    Torsion on shaft with square end

    Hi All, I have a shaft attached with this thread. I have couple questions: 1) What would be the best way to control the central axis of the shaft given I have a square end on one side. 2) How to calculate torsion for such a shaft? 3) It's a power transmitting shaft, what would be a good setup...
  12. SR71-110

    Endurance tester for rubber material

    Hi All, I am working on a project similar to this (https://www.youtube.com/watch?v=Iuya2buTQKE). My question is how we can size a motor for such a system. If my wheel is pushing on the drum with a vertical force, what would be the best way to record the horizontal force (Slippage) on the wheel...

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