JET 1221vs Alignment

Discussion in 'Newbie' started by David Gilliland, Aug 24, 2017.

  1. Mike Johnson

    Mike Johnson

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  2. john lucas

    john lucas

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    I looked at the club lathe this morning. It runs very quiet. It looks like the inboard bearing may be installed from the front and the rear one from the rear. Couldn't tell for sure if the hand wheel would tighten or loosen the fit of those bearings but you can loosen the setscrew and find out. Can't remember if the handwheel is left hand threaded or not however so that could be a little tricky. From your videos the noise definitely seems to be coming from the top spindle. As far as alignment goes did you clean out the morse tapers before inserting the drive and live centers. That can easily throw them off. The tailstock on the club lathe has very little slop but you should always push the tailstock toward the ways either front or back before locking it down. That or twisting the tailstock might bring things back into alignment. I don't know if small lathes are subject to this but larger lathes can actually twist the bed slightly if the legs are not level. Bolting it down to a board that isn't perfectly flat could feasilbly have the same effect of twisting the bed which would throw the tailstock out of alignment.
    Well that's about all I can think of this morning.
     
  3. Mike Johnson

    Mike Johnson

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  4. Mike Johnson

    Mike Johnson

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    This is why many machines are taken apart and rebuilt after they arrive from offshore.
    They are using poor quality bearings or were mishandled and destroyed during assembly.
    Bearings being a precision component can be destroyed if not stored properly, and can also
    be damaged during assembly if they are not assembled in a manner that is suitable for the
    design of the bearing. The company I work for commission large numbers of rotating equipment
    each year, many times we will dis-assemble a million dollar machine after it arrives from offshore to
    validate and commission the equipment prior to running it. We have found on many occasions knock-off
    bearings that are made by unknown sources, we will contact the bearing manufacturer and provide the
    part number and serial number and many times they come back as being fakes. Documentation is many
    times lacking on these machines as we archive and record dimensions and specifications and verify
    components are made from specified materials. This allows us to order and stock repair parts for critical
    equipment that needs to run and can be repaired on short notice. Bearings are one of the most common
    "knock off" components in the industry.

    If you return your old lathe to get a replacement, have them plug in the new lathe and run it at the store to verify you are getting a working unit.


    View: https://www.youtube.com/watch?v=KpY7u9e2UG4
     
  5. Mike Johnson

    Mike Johnson

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    This is another common problem that occurs with this lathe.
    if the set screw loosens on the spindle pulley it will move along the shaft and ride against the spindle lock.
    This will create a ticking noise on each revolution of the spindle much like a bad bearing.
    Align the spindle pulley with the motor pulley so the belt runs true.
    Use some loctite thread compound to secure the set screw from coming loose from vibration.



    View: https://www.youtube.com/watch?v=xrUvHWcPpWw
     
  6. Bill Boehme

    Bill Boehme Administrator Staff Member

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    Another method is to use a second setscrew on top of the first. Be sure to make a note in your manual and a mental note about having double setscrews. Don't ask me why this is important.:D
     
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  7. David Gilliland

    David Gilliland

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    Thanks so much for all your thoughtful replies. I decided to return the lathe with 1 day remaining in my amazon return window. They shipped a new one out immediately. It arrived days later with a massive hole through the box, likely from a forklift, that had completely sheared off the hand wheel in the back! So frustrating. I finally returned everything for a refund and found a local vendor who I bought it from.

    As soon as I started up this new one it was clearly worlds better than any of the machines amazon had sent me. The tail stock and head stock are aligned perfectly, the vibrations are minimal and it's so much quieter. Don't think I'll ever make a large equipment purchase from amazon again. It feels like they sent me previously-returned equipment or equipment that was for some reason or another was second rate.

    Just got a chuck and pen mandrel for my birthday so I'm pumped to start turning on this new and properly-functioning lathe!
     
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  8. Bill Boehme

    Bill Boehme Administrator Staff Member

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    Wonderful. It's always good to hear a happy ending. I always buy from trusted local dealers whenever I can. Even if the cost is a little more, after sales support is an important benefit.
     
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  9. egsiegel

    egsiegel

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    for the alignment...have you tried adjusting the leveling feet? based on your picture, I would raise the back leg on the tail stock end a hair.
    this will give a little twist and move your points into alignment.
     
  10. john lucas

    john lucas

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    Not sure how much if any that 1221 will twist. It's short and quite substantial. If I think about it I'll look at our club lathe tomorrow night and might see if it's possible to put a shim under one leg and see if it twists any.
     
  11. Bill Boehme

    Bill Boehme Administrator Staff Member

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    I seriously doubt that there will be any noticeable twisting.
     
  12. egsiegel

    egsiegel

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    not sure about the 1221...but it works with the 1642
     
  13. john lucas

    john lucas

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    Long bed lathes can twist if the legs aren't level. the 1221 is a short bed lathe and is far stockier than most mini's which is why I thought it wouldn't work. Didn't have time to play with the lathe last night.
     

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