ESM-59 spindle nut....
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  1. #1
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    I want to dismantle the headstock on my hardinge
    ESM-59, that's a split bed 59 lathe.

    I'd like to inspect the lube in the ball
    bearings as the machine is low hours but
    quite old.

    I have the belts and the pulley off the back
    side of the spindle, but there's a nut that
    snugs down the inner race stack under it.

    I am pretty sure it's right-handed, as I've
    checked the threads that are exposed. But this
    is one of the tightest nuts I've ever seen.

    I can lock the front of the spindle with a
    bar through a driver plate, and I've got a tool
    made with four dowel pins that engage the holes
    around the face of the nut.

    But this thing is serious tight.

    Anyone done one like this?

    I used the same tool to dismantle the 47
    split bed headstock that I had, and it came
    undone with hardly a twitch. This thing
    has me stumped. It's been dosed with kroil
    overnight, now.

    Jim

  2. #2
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    Well if anyone is interested, or ever gets into
    doing one of these, the nut was just on there
    *real* tight.

    After dosing it with kroil overnight, I modified
    the tool a bit also.

    Because this nut is deep inside the headstock,
    my existing tool wasn't quite the best. The
    open headstock it had been made for allowed me
    to put a pipe wrench on the tool - which was
    a steel pipe coupling from HD, with four slots
    milled into it to accept four 1/4 inch diameter
    dowel pins.

    The headstock was so deep that I could only just
    grasp the last 3/8 inch of the coupling, for this
    I used my largest 6-jaw chuck. Originally when
    applying force to this, it would slip on the
    outer surface of the coupling - even though
    the surface had been machined to eliminate the
    casting defects.

    I drilled and tapped it for six 10-32 screws,
    which gave the chuck jaws something to push
    against.

    This time the nut came loose with some serious
    leverage, and I was able to pull the spindle
    partway out to get a bit more grease into the
    bearings.

    Jim

  3. #3
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    Jim,
    I have a copy of the Hardinge bearing replacement instructions for this headstock. It is a two page document with step by step instructions and a section drawing of the headstock. It's a poor copy but adequately legible. If you're interested, email me off list with mailing instructions - my scanner is not hooked up now.
    Regards,
    Jim

  4. #4
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    Thanks, I would be interested to see what
    hardinge says about this.

    Jim
    520 Highland Ave
    Peekskill, 10566

    Thanks so much. I can be pretty sure what
    at least one line item on the instructions
    would be: "Get a really, realllly big
    wrench...."

    [img]smile.gif[/img]

    Jim

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    Jim, thank you ever so much for those hardinge
    instruction sheets. They were quite informative
    and actually very legible!

    I would say that my lathe does indeed have
    a "Type R" headstock as the construction, as
    far as I could acertain, matched what was on
    the cross-section diagram perfectly. It
    was pretty clear from the diagram that hardinge
    made two versions, one with and one without the
    large phenolic handwheel on the outboard side
    of the spindle.

    Thanks again - Jim

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    Jim & Jim

    I'm just getting into one of these ESM 59 lathes and I'd like to have a look at that manual too. If no one has scanned it yet, I can offer my services. Please email me off list.

    Thanks,

    Jeff

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    Update on my ESM-59:

    Thanks to Jim S. for sending the instructions from Hardinge. These are very nice to have. I'll be happy to scan these for anyone else that needs them.

    The clamp nut that was fighting Jim Rozen is now fighting me. I've got nothing to mount on the spindle, so I don't have a good way to keep it from turning while I try to turn the nut. I guess I'll have to pick up a drive plate, or try to fabricate something.

    Does anyone know what size drive belts this lathe is supposed to have? My machine had no belts on it when I aquired it. A crude measurement suggests a length of 60-62 inches and the pulley grooves are 7/16" wide.

  8. #8
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    "Does anyone know what size drive belts this lathe is supposed to have?"

    Usually 3L, but a special long length which is generally available only from McMaster-Carr.

    You'll have to determine the length yourself, as there are several lengths, which go along with the several lengths from the motor to the countershaft, if fitted.

    Possibly best to install a 3L Power-Twist belt.

    IIRC, this machine takes a pair of belts.

  9. #9
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    I know this is a pretty old thread but I would be interested in the mentioned bearing replacement instructions. Does anyone have a copy they could share? Thanks


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