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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

    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


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

      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