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  1. #1
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default motor shaft end float - is 2mm excessive?

    Hi all,

    I'm giving some love to a Waldown C-0 tool post grinder. The shaft has about 2mm of float - which to me seems a bit excessive. Full extended in one direction the fan rubs every so slightly, and back the other way, something else rubs ever so slightly ... so I've a feeling this isn't how it is supposed to be.

    The Waldown parts list for a C-0 doesn't go into the motor parts so I'm not sure if there should be wave washers or shims or whatever. But a teardown by Max Grant here: https://youtu.be/7QoXMNJueDs shows no washers or shims in there so likely not.

    All comments and thoughts welcome.

    Greg.

  2. #2
    Join Date
    Nov 2016
    Location
    Gulfview Heights, Adelaide
    Posts
    83

    Default

    It does not sound right to me. Are the bearings original? I am wondering if they are the correct size.

    Paul

  3. #3
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default

    Thanks Paul. Not sure if bearings are original, but they are SKF and have 'Australia' on them - so maybe not that recent. They are a 6200 size, and that is the same size shown in the Max Grant rebuild.

    If not original, maybe the originals were 1mm each thicker. Not sure if there is such a thing but I'm no expert.

  4. #4
    Join Date
    Nov 2016
    Location
    Gulfview Heights, Adelaide
    Posts
    83

    Default

    I think the bearings are the correct ones. Where is the bearing/shaft loose? On the shaft or the outer bearing radius?
    The bearing on the pulley end should be a press fit on the shaft and the housing.

    Paul.

  5. #5
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default

    Thanks Paul - bearings are press fit onto shaft. The gap is in the bearing to housing in each end plate. Many motors I pulled apart have wiggle room there for wave washer or two in them to deal with that float.

  6. #6
    Join Date
    Dec 2013
    Age
    56
    Posts
    1,416

    Default

    I'd just add a 2 wave washers.
    I bought some 28mm ones recently and they are cheap in a 10 pack.

    They have a good wave to them so 1 will do it for 1mm at each end.
    Using Tapatalk

  7. #7
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,436

    Default

    Hi Greg, Paul,

    Greg I think that you may be correct, there should be a wave washer in there. If someone has had it apart it isn't always obvious that there is a washer in the housing, and like me would have put it down on the bench and the washer drops out and ends up on the floor unnoticed.

    Putting new ones in would not go amiss !
    Best Regards:
    Baron J.

  8. #8
    Join Date
    Aug 2015
    Location
    Melbourne, Australia
    Posts
    843

    Default

    Thanks Baronj, Paul,

    That seems to be the case - I reckon I'll just bung em in and see. I'll order some of those.

    Then wait a fortnight for delivery!

    Thanks again. 👍

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