Lathe pulley repair with pics

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  • wierdscience
    Senior Member
    • Jan 2003
    • 22085

    Lathe pulley repair with pics

    At work the Boss has a HF 9x20 tucked back behind the counter to do quick and dirty jobs on small parts for customers.Awhile back it dropped the setscrew out of the motor pulley and spun the shaft in the pulley.Patched it temporarily when it happened with shim stock and a new setscrew,but it wasn't right.

    After seeing this thread by Philbur I had the idea to fix it by channeling my inner German



    Bored a 3/4"per foot taper in the pulley and machined up a collet of the same taper with a 14mm bore.Sawed the splits in the collet with a .035" Jewelers saw and drilled a 5mm hole for a pin to engage the motor shaft key slot.


    The collet is pulled up tight with the 1/2-20 nut and washer.It drew up tight,won't slip ever and the run out is less than .001"TIR.Only took me 1hr and 15 minutes not counting looking for a Jeweler's saw that wasn't dull or split
    Last edited by wierdscience; 06-13-2012, 09:36 PM.
    I just need one more tool,just one!
  • wierdscience
    Senior Member
    • Jan 2003
    • 22085

    #2
    Another view of the collet showing the slits.They were done by holding the collet blank buy the threaded end in a 5-C hex block clamped in the mill vise.I ran the slots full through the wall of the collet and into the opposite side.

    Last edited by wierdscience; 06-13-2012, 09:47 PM.
    I just need one more tool,just one!

    Comment

    • darryl
      Senior Member
      • Jan 2003
      • 14400

      #3
      I like that method. I wish more pulleys were made to mount like that.
      I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

      Comment

      • John Stevenson
        Senior Member
        • Mar 2001
        • 16177

        #4
        Originally posted by darryl
        I like that method. I wish more pulleys were made to mount like that.
        They will be now
        .

        Sir John , Earl of Bligeport & Sudspumpwater. MBE [ Motor Bike Engineer ] Nottingham England.



        Comment

        • wierdscience
          Senior Member
          • Jan 2003
          • 22085

          #5
          Originally posted by John Stevenson
          They will be now
          Lets hope,between the chewing gum alloy in the pulley and the centerless ground concrete rebar motor shaft something has to change at the factory
          I just need one more tool,just one!

          Comment

          • Your Old Dog
            Senior Member
            • Dec 2004
            • 7269

            #6
            So what's the secret to cutting that distance with a jewelers saw and having it go where you want it to go? Mine always veer off course......way off course!
            - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
            Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

            It is true, there is nothing free about freedom, don't be so quick to give it away.

            Comment

            • wierdscience
              Senior Member
              • Jan 2003
              • 22085

              #7
              Originally posted by Your Old Dog
              So what's the secret to cutting that distance with a jewelers saw and having it go where you want it to go? Mine always veer off course......way off course!
              The spindle has to be dialed into the table,the saw needs to be reasonably sharp and much care taken when starting the cut.Let the saw do the work and cut it's own path for the first 1/8" or so of depth,use plenty of cutting oil.

              The single biggest thing is the arbor.I make my own and face them true in the mill.The commercial ones,the cheaper ones anyway put a cup in the blade when tightened.That tends to get them started off kilter and it goes down hill from there.
              I just need one more tool,just one!

              Comment

              • motorworks
                Senior Member
                • May 2002
                • 1427

                #8
                Very nice work two thumbs up
                eddie
                please visit my webpage:
                http://motorworks88.webs.com/

                Comment

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