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Rusnok model 70 spindle bearings

Discussion in 'RUSNOK TOOL WORKS' started by jjharley, Jan 30, 2017.

  1. jjharley

    jjharley United States Iron Registered Member

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    Hi guys,
    Anybody know if the spindle and drive bearings on a Rusnok 70 are a standard bearing (inexpensive).
    thinking about doing a replacement, have a little vibration when I hit 5000 rpm.
    Also the Rusnok head is mounted on a Benchmaster.
    Unit motor was replaced with a variable speed DC motor and controller (2.25HP).
    so maybe it's just the drive pulley bearings.

    Thanks for any input
     
  2. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    Just an WAG, the original one's were probably a class 3 or 5 bearing. The only way to really know is to pull the spindle and remove the bearings and look for the bearing numbers. Depending on the name brand of the bearings, the numbers are generally stamped on the inner or outer face of the bearing. From the number, sometimes, it will indicate the degree of precision. Also pay attention to the arrangement of the bearing, which direction it came off from. A Sharpie is handy here as long as your marks don't get erased from the bearing. And no, I do not have a clue on bearing numbers of these bearings in you Rusnok spindle. You might go over to Vintage Machinery website and look up your brand and see if anything has been posted that could give an idea of what you need. Ken
     
  3. chips&more

    chips&more United States Active User Active Member

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    So what makes you think it’s a bearing problem when it’s going @ 5K? Man that’s fast! And the bearings are quiet at that speed? Just about any part of the drive train at 5Krpm is a likely suspect for vibration. And the bearings are quiet at that speed? (I’m repeating myself). Maybe stand back for safety reasons when you do that again…Dave
     
  4. jjharley

    jjharley United States Iron Registered Member

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    Thanks for the input will do some more checking on possible bearing #s. Curious about the $ of the set of bearings.
    Will play around with the belt tension, might have it too tight.
     
  5. rzbill

    rzbill United States Steel Registered Member

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    JJ,
    This is my first post on this forum although I have enjoyed reading this site for some time.
    I also own a Rusnok 70 head.

    5 or so years ago I disassembled the quill and replaced one of the bearings. It really was a non issue. I took it apart, read the bearing number and got one from the local bearing supply house. There were no special markings on the bearing to indicate a class other than common bearing. Since I bought it used, I cannot claim the failed bearing was original from the factory. While my memory of it is weak, I think the bearing I replaced was the one closest to the belt pulley.
     
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  6. jjharley

    jjharley United States Iron Registered Member

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    Thanks for the reply.
    That's kind of what I am seeing with small vibration in the head casting but nothing in the quill when it's lowered.
    But since the quill isn't showing any vibration I will probably hold off on fiddling with it.
    Did the quill come apart easy?
    Thanks
     

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