Need advice: shaft coupling to adapt difference sizes diameters

    KHI wants us to order their motor (which I found out later is a Sanyo Denki motor anyway) to be able to control an RTU as an external axis. Due to this being a demo cell with a smaller kawasaki RS007L , we ended up getting a ball screw linear actuator to act as an RTU instead due to time constraints and sourcing limitation from Kawasaki. What happens is that we now have a motor that has a shaft size of 22mm, but the linear actuator has a female input of 14mm with a NEMA 34 mounting. (https://vention.io/parts/enclo…ctuator-855mm-length-1283)


    I'm thinking of getting a flexible coupling from McMaster, with one side 14mm and one side 22mm (https://www.mcmaster.com/coupl…xible-shaft-couplings-10/) And then couple that to a separate 14mm shaft with keyway that will go to the linear actuator side.


    My questions are this:

    - Is it okay if I forego the NEMA 34 plate mounting if I align the shaft and keyway in-line with the actuator and mount the motor directly onto the workcell floor?

    - Anything else that I need to keep in mind or some recommendations when people are faced with this situation?

  • Lemster68

    Approved the thread.

    what is the backlash of the coupling? spider is compressible material (which can dampen vibrations) but i would think that added elasticity could impact performance... probably not an issue for linear drive.

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    Thumbs Up 1

    I've used these in a similar situation and they have held up thus far. Only difference is we were using a Bishop-Wisecarver LA and an Omron servo motor. You just want to make sure that the spider is tight enough to control your backlash and lose enough that it will account for any misalignment.

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