Hardinge Cataract Quick Change cone bearings - Page 2
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  1. #21
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    Hi Larry,
    good info there, makes sense, is the long side of the rectangle in line with the spindle axis, or perpendicular? I will have to take another look at the spindle key area, but it defiantly was not invisible, looked like welded to me, but could have been a really lousy peen job.. Ill look again.
    Thank you,
    Greg

  2. #22
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    Quote Originally Posted by Greg Dawson View Post
    Hi Larry,
    good info there, makes sense, is the long side of the rectangle in line with the spindle axis, or perpendicular? I will have to take another look at the spindle key area, but it defiantly was not invisible, looked like welded to me, but could have been a really lousy peen job.. Ill look again.
    Thank you,
    Greg
    In mine I think it was diagonal. The head of the key is visible in the photo of my 'exploded view' above.

  3. #23
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    Ok, I see it there, looks like maybe .187-.250 square, Mine looks nothing like that, much larger and uglier.

  4. #24
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    I got the early (Ser. No. 289) 59 head out, along with some later lever closer adjusters and took pictures. This head is in amazing condition, still with original paint. The previous owner took it apart and I have never put it back together, making it handy for taking pictures.

    The key in the spindle is about 1/8" x 1/4" x .05". The keys in the late model adjusters are about 1/8" x 5/16" x .05". I got a picture of the hole (no. 20 drill size) in an earlier adjuster that has the key missing so you can see the four notches. I suppose the notches could be produced by driving a hardened tapered square punch into the hole while the part was still soft.. And one of the adjusters has enough rust on it to see the top of the key which looks square after peening into the notched hole. I took a picture of the spindle showing the bearing surface behind the key notch so that you can see there is no visible sign of the top of the key. That late adjuster key is probably still available from Hardinge, but the stem is too short for use in a spindle. The part number is 60000493 (old number 6-493). The stem is .153" dia. x .347" long and the key is .122" x .310" x .058". To make a new spindle key, I would use those key dimensions and make the stem fit the existing hole.

    Larry

    dsc01959.jpg dsc01962.jpg dsc01960.jpg dsc01961.jpg
    Last edited by L Vanice; 06-13-2019 at 08:14 AM.

  5. #25
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    Pictures of the collet closer "adjusting nut," as Hardinge calls it. Note how the end of the key is bevelled on the installed keys, but not on the unused keys.

    Larry

    dsc01964.jpg dsc01966.jpg dsc01963.jpg dsc01965.jpg dsc01967.jpg

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  7. #26
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    finally made it up to my Uncles shop to take a crack at it, I chucked up a fresh Hardinge back plate into the victor, threaded the spindle into that, and got to mapping. The tail of the rear journal was running .043 runout, but the highs were all pretty much in a line from the key. cut out the key someone welded in, they had taken a pin and pressed it into a plug and welded that into the spindle introducing a kink. I hoped it would spring back. It did not.

    After an hour of my best Keith Fenner impression I now have .0025 run out in the worst spots, and the spindle nose runout looks to have improved by 90%. I used the coolant pump on the lathe to cool each heat spot, did it right in the lathe, worked quite well, I probably hit it in 15 spots total, with no overshoot.

    Today Ill grind and polish the front journal and make a new cone bearing to match the new size. little luck I wont make it worse.

  8. #27
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    Grind went well, took maybe .002 to clean up, used a Dumore #5 tool post grinder with a Norton stone, I'm pretty tickled with the results. Tomorrow is bearing day.

  9. #28
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    new bearing is roughed out, very close fit on the taper and bore, I may hone it just a touch. needs the key seat cut and the groves, felt window and split milled. also brazed up the missing tooth on the back gear and cleaned it up in the Gould and Eberhardt Hob. pictures to follow.

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