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Thread: Pump/ motor shaft coupling

  1. #1
    Supporting Member Frank S's Avatar
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    Aug 2015
    Peacock TX
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    Frank S's Tools

    Pump/ motor shaft coupling

    Getting ready to build up a power unit After rummaging around finding a 3 hp motor with the valve block still attached after pluging it in to see if it ran I started searching through my pumps I found several so disassembled a couple to see which one might be good both were. I search and search and could not find the correct shaft coupling for the motor to the pump I had selected. Then I remembered the reason why so many of these units fail was due to the couplings.
    So I took some measurements
    Pump/ motor shaft coupling-20190811_123000cx.jpg
    then drew it up
    Pump/ motor shaft coupling-pump-motor-coupling.jpg
    Then to find a hard enough piece of stock to make the coupling out of the closest thing I could come up with to be near hard enough was a 7/8" grade 8 bolt
    Pump/ motor shaft coupling-20190811_144809cx.jpg
    After turning it down
    Pump/ motor shaft coupling-20190811_151123cx.jpg
    I milled the ends to fit the pump on 1 end and the motor on the other then thought one things these coupling do is the can wobble of center since nothing held them true except for the slits and tang being 90 to each other
    on 1 end I recessed the slot by counter boring the coupling just a little and for the other end I found that PVC nonconductive flex conduit was just about .2
    020" undersize in bore I pressed it over the coupling and the motor shaft the pump end has the recess so both ends are now held centered
    Pump/ motor shaft coupling-20190811_163431cx.jpg
    Assembled and ready for a tank to mount it in
    Pump/ motor shaft coupling-20190811_162758cx.jpg

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  2. The Following 3 Users Say Thank You to Frank S For This Useful Post:

    baja (Aug 13, 2019), Jon (Aug 15, 2019), Seedtick (Aug 12, 2019)

  3. #2
    Content Editor
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    Aug 2013
    Thanked 1,857 Times in 1,657 Posts

    Thanks Frank S! We've added your Pump Shaft Coupling to our Miscellaneous category,
    as well as to your builder page: Frank S's Homemade Tools. Your receipt:

    2000 Tool Plans

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