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  1. #1
    astroracer's Avatar
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    Floor Jack Repair

    A friend of mine broke the diecast universal joint in his Craftsman floor jack. He couldn't find a replacement universal so, in looking at the broke pieces, I figured it wouldn't be that hard to make a new one out of steel.

    The pieces aren't that big. Only 3/4" in diameter. All of the parts after dis-assembly.


    I found a piece of 3/4" diameter steel in the drop pile.

    I cleaned up the OD in the lathe, faced off the ends and drilled out the bore's for the mating parts. Test fitting the parts.


    Continued in next post.

  2. The Following User Says Thank You to astroracer For This Useful Post:

    kbalch (12-14-2015)

  3. #2
    astroracer's Avatar
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    With that done I clamped the piece in the vise on the mill and machined off both sides.


    With that done I picked up the ends and center drilled for the pin holes.

    After drilling out the pin holes I flipped the part 90 degrees in the vise and hogged out the center portion with a 1/2" end mill.


    Continued in next post.

  4. #3
    astroracer's Avatar
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    After some deburring and cleanup.

    I split the piece into two.

    Rounding over the cut ends and a bit of assembly and I had a new U-Joint!



    This was fun project and it will save an old jack from the scrap pile.
    Mark
    Last edited by astroracer; 12-13-2015 at 05:45 PM.

  5. The Following 8 Users Say Thank You to astroracer For This Useful Post:

    C-Bag (12-14-2015), DIYer (12-15-2015), Jon (12-13-2015), kbalch (12-14-2015), NickP (11-13-2017), Paul Jones (12-14-2015), PJs (12-15-2015), rlm98253 (11-12-2017)

  6. #4
    Content Editor DIYer's Avatar
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    Thanks astroracer! We've added your Jack Universal Joint to our Jacks and Lifts category, as well as to your builder page: astroracer's Homemade Tools. Your receipt:


  7. #5

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    Very nice job! I'm sure your friend was happy!

  8. #6

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    That's about the size of a Proto u-joint for a ratchet wrench.


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