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Thread: PoorMan Grinder -was small motor shaft repair + pics

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  1. #1
    Join Date
    Nov 2002
    Posts
    499

    Default PoorMan Grinder -was small motor shaft repair + pics

    Well, I really did want to try to weld it, but I refrained! : D > : D >
    Thanks for the replies.

    Here's what I did:

    Made a tool post mount for my new Poorman Grinder. : D >



    Gound, & ground, & ground (fr .312 to .197) :



    Used a narrow wheel at end - trying to control taper toward shoulder:



    Pressed on a hard sleeve w/ tailstock ram. Used the 100W light bulb as bearing heater trick (prolly learned here!) and a bit of ice to help:



    Trimmed the length w/ cut-off wheel.

    Gotta get a that little bearing out now.

    New ?? - Sleeve is 8mm OD (.3145), needle bearing is 5/16, am I likely to have to reduce the sleeve?

    uute

  2. #2
    Join Date
    Nov 1999
    Location
    SE OZ
    Posts
    2,084

    Default A goodie!!

    Nice job and good thinking.

    Not to mention your excellent patience - I wonder how many could have waited and thought it through as you did.

  3. #3
    Join Date
    Nov 2002
    Posts
    499

    Default

    Hi oldtiffie,

    Ya, it took a while. The shaft was hard, but I think I could have turned it. However, it was tight quarters to get at it w/ my carbide cutters and my big fear was that the steady rest was held by make-do clamping over the gap in my lathe - wasn't sure it would stay put under cutting forces!

    uute

    Hey! That was a better safe than screwed-up moment for me - may be a first!

  4. #4
    Join Date
    Dec 2007
    Location
    northwest wisconsin
    Posts
    1,175

    Default

    is therre any chance you could now bore out where the needle bearing mounts so it would accept a ball bearing ? ? ? ? because the new shaft area is now much softer than it probably was to start out with, it is probably not really sufficent for the needle bearing. . . . (think glass smooth and hard)

    or do i need to get more coffee this morning ?

  5. #5
    Join Date
    Aug 2006
    Location
    Taylorsville Ky
    Posts
    5,882

    Default

    Glad you used a hard sleeve to run in the needle bearing.

    You can remove the needle bearing cup by digging out the needles and pulling the shell with a pilot bearing puller.

    I am assuming it is pressed in a blind hole.

    I don't remember you saying it ran in a needle bearing. Had you said that I never would have suggested using any thing but Belzona to finish it with. There is a grade of Belzona that is harder than steel and has to be ground.

    In fact you stated in opening post, "5/16" shaft kind of "flatted" itself on one side in roller bearing. Best option?? :"

    A roller bearing is NOT a needle bearing.
    Last edited by Carld; 10-19-2008 at 10:33 AM.
    It's only ink and paper

  6. #6
    Join Date
    Nov 2002
    Posts
    499

    Default

    Hi Carld,

    My mistake, I always considered needle bearings just small roller bearings as opposed to ball bearings, but yes - I should have said needle bearing the first time.

    This is a hard, commercial sleeve designed to run as inside race for needle bearing.

    I do wish I could upgrade to a ball assembly, but as Carl surmised - needle bearing mounts in blind "post" type mount, so no easy way to modify. Good news is there is a bit of "hole" left behind the bearing, perhaps I can "hook" on that.

    Thanks again for the help.
    uute

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