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D Shaft wears off with usage - what is the best Hub option

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  • D Shaft wears off with usage - what is the best Hub option

    One of the primary issues our team has faced in prior FTC years is the D-shaft wears out when used with the TETRIX Motor Shaft Hub - https://www.pitsco.com/TETRIX-Motor-Shaft-Hubs

    The D-shaft hub is coupled using a pinch screw which is essentially held in position by friction and so during practice, the D-shaft wears and starts to slip.

    What is the best way to couple a D-shaft so that it will not wear out.

    Thanks a lot in advance for the help.

  • #2
    Use Loctite to keep the set screw from backing out.

    Use two hubs back to back so two set screws share the load. Drill out the tapped holes to clearance on one of the hubs so the assembly of gear (or wheel) and hubs are all drawn together tight. This has been working well for my team where you have space for it.

    I was going to cleverly ;-) say switch to Actobotics which has better hubs, which just gave me an idea. I haven't tried this yet but get an Actobotics 6 mm D-Hub or clamping D-hub and a hub adapter.

    https://www.servocity.com/0-770-set-screw-d-hubs
    https://www.servocity.com/0-770-clamping-d-hubs
    https://www.servocity.com/hub-adaptor-b

    Comment


    • #3
      Originally posted by 3805Mentor View Post
      ... I haven't tried this yet but get an Actobotics 6 mm D-Hub or clamping D-hub and a hub adapter.

      https://www.servocity.com/0-770-set-screw-d-hubs
      https://www.servocity.com/0-770-clamping-d-hubs
      https://www.servocity.com/hub-adaptor-b
      That should work. Also, if you use ServoCity wheels or sprockets, you wont need to use a hub adapter.

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      • #4
        Thanks a lot!! We have used Loctite before...they hold up good for a while, but as the team practices a lot, they start to wear out. We will try the Actobotics D-hub and adapter.

        Comment


        • #5
          You can also consider AndyMark's "Nub" product, which has a 6mm D-bore that mates with the motor shaft.

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          • #6
            Our team had this issue a few years ago, we tried Loctite and the AndyMark Nubs which worked better but not perfect, by the time we made it to Worlds we would have to tighten every nub before every match for the robot to even drive. We ended up switching to 1/2 inch hex shafts for our drive train and later our attachments. It's a *little* bit overkill, but we wanted to make sure that we could never slip, and we never had any issues with it.

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            • #7
              Consider also the ServoCity / Actobotics D-Bore 6mm barrel hub with a Hub Adapter B (.770 to .625 pattern adapter AKA Actobotics to Tetrix). Or use the barrel hub with an Actobotics wheel (or sprocket, or whatever) to eliminate the need for the adapter. The barrel hub has dual pinch bolts and should be able to support heavier loads.
              John McDonnell
              Co-Mentor, Team 5873
              https://www.facebook.com/Team5873

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