DV-59 Bearing Change
Close
Login to Your Account
Likes Likes:  0
Results 1 to 4 of 4
  1. #1
    Join Date
    Mar 2006
    Location
    Carol Stream, IL
    Posts
    13
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Post

    I'm trying to change the spindle bearings on a DV-59 and am running into trouble getting the nut off the back of the spindle. THe pin holes have been egged out to the point that I have to use a hammer and a pin punch and I don;t know if it is a left or right hand thread. I've banged it about a quarter of an inch either way and notice no difference in movement.

    Please help me on this one if you can. I don't want to mess this one up for the obvious reasons.

    Geoff

  2. #2
    Join Date
    Feb 2004
    Location
    peekskill, NY
    Posts
    26,384
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    5914

    Post

    My split-bed ESM-59 had the nut as standard,
    right hand fastner. It was hella tight though,
    I had to make up a special wrench to undo it.

    I had to hold the special pin wrench (face
    spanner, really) onto the nut with the outer
    nut that held on the spindle locking ring
    that the lock pin engaged.

    The trouble with that designe was, you could
    not get at the preload nut (the one you are
    into) without *first* removing the ability to
    lock the spindle.

    What WERE they thinking???????????????

    That problem was fixed in the DV series machines
    I think because the lock pin engages the
    preload cylinder at midpoint of the headstock.
    So you can at least lock the spindle.

    But the wrench to undo the preload nut will
    have to be about three feet long, that's what
    I got up to before mine budged. I was locking
    the spindle with driver plate on the front,
    I sheared the pin on that twice during the
    exercise.

    Spend as much time as you need to fabricate the
    absolute best four-pin face spanner you can
    figure out. Use something to tie it in hard
    to the nut, even if you only use a piece of
    threaded rod through the spindle, so it cannot
    cam out.

    Good luck.

    Jim

  3. #3
    Join Date
    Jan 2006
    Location
    Milford, CT
    Posts
    3
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    0

    Post

    I had the same problem with my ESM-59. To get the clamp nut off, I made a tool with four pins. However, the only tool I had that fit on the spindle nose was a step collet closer, so I had no easy way to hold the spindle still while loosening the nut. I wound up removing the headstock a grabbing the collet closer with the chuck on another lathe. Then I was able to loosen the nut. It was right handed and tight, but no so tight as the one Jim Rozen described.

    I tried a pin punch and hammer first, but there was no way that was going to work.

  4. #4
    Join Date
    Feb 2004
    Location
    peekskill, NY
    Posts
    26,384
    Post Thanks / Like
    Likes (Given)
    0
    Likes (Received)
    5914

    Post

    Intersting. I guess somebody else found the
    same hardinge 'feature' that I did.

    I used a driver plate, which has a slot across
    the front, for the dog to engage in, but I
    simply put a two foot long piece of rectangular
    stock across the slot and braced that against
    the bed, cushioned with rags.

    Like I said, I sheared the pin twice while
    undoing that nut.

    I was only going into the headstock as far
    as I had to, to get some grease in there. The
    machine had an intermittent bearing whine that
    sounded like it might be from the grease being
    old and dried out, the machine sat for many
    years unused.

    I only extracted the spindle out far enough
    from the front so I could get a syringe into
    the two front bearings to inject a bit more
    grease. It seemed to help a lot.

    I was worried about getting the old bearings
    back in with the alignment marks, if any,
    back in the same spot. I've heard tell those
    bearing go in with dots or marks that should
    be lined up, and I knew mine were in there
    from the factory, correctly. So I tried to
    disturb it all as little as possible.

    Jim


Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •