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bushing-shaft clearance ???

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  • bushing-shaft clearance ???

    I have to make a bronze bushing for a 10 stage high lift water pump. The pump has a 1.5" stainless steel shaft and will be running in water. No other lubrication. I'm thinking 1-2K clearance on the bore. Yes??? No??? maybe???
    Ernie (VE7ERN)

    May the wind be always at your back

  • #2
    I manufactured and rebuilt them for years. I would go for the .013 .

    Vertical turbine pumps are made with .006 to .013 clearance depending on the
    manufacturer.

    OD on the bushing is usually .002 to .004 press

    most pumps run at 1800 RPM

    Use a SAE 660 bearing bronze. SAE 664 bearing bronze is softer and will collapse more when pressed into the hole.

    re- boring the holes is not necessary with SAE 660

    If it has closed impellers the wear rings use .016 min up to .025 max.
    Last edited by JS; 12-23-2010, 09:55 PM.
    NRA member

    Gun control is using both hands

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    • #3
      JS.....thanks for that reply. After posting this question I found a chart from Anchor Bronze that showed a clearance of .0015-.004.

      http://www.anchorbronze.com/bearingsc.jpg

      After reading your reply, obviously this would be not enough in this application. I will go with your years of experience. Thanks again
      Last edited by dockrat; 12-23-2010, 08:46 PM.
      Ernie (VE7ERN)

      May the wind be always at your back

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