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Thread: slip fit bearing chart

  1. #1
    Join Date
    Jun 2006
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    Alabama,USA
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    Default slip fit bearing chart

    where can I find a chart that tell me how much tolerance I need to allow for fitting bearings to a shaft that I will turn?The problem is I don't have the bearings in and I have to go ahead and spin the shaft.The shaft is 4140 carbon and the beaings are 3/4" pillow block bearings.Or what do you guys usually allow for such fit?RPMS will run 950rpms with meduim load

  2. #2
    Join Date
    Nov 1999
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    SE OZ
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    Default Tables of fits

    These (in metric) - from a previous thread - might help:






  3. #3
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    May 2002
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    NL
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    Default

    Bearing fits,
    Housing and shaft:
    http://www.conweb.com/tblefile/bearfta.shtml
    please visit my webpage:
    http://motorworks88.webs.com/

  4. #4
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    Jun 2006
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    Alabama,USA
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    Default excellent answers

    you guys rock thank you for the info.

  5. #5
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    Jan 2003
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    On the Oil Coast,USA
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    16,809

    Default

    You said "pillow block",they have setscrews or eccentric collars for a reason.They are made to be a slip fit,or in your application .750+.000/-.001"
    I just need one more tool,just one!

  6. #6
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    May 2005
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    UK
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    Default

    My RHP manual for their Self-Lube ball bearings (pillow blocks etc) gives shaft limits of +0.000 to -0.002" for what they call 'low speeds', in this case up to 1700 rpm.
    up to 4200 rpm on a 3/4" shaft it's +0.0000 to -0.0008"

    Tim

  7. #7
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    May 2002
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    Default

    Sorry
    The chart above was for deep groove ball bearings. Keep it on just in case. For pillow blocks: Infor from "dodge bearings"

    ENGINEERING/TECHNICAL

    Shafting:

    Standard Shafting-Table 17 indicates standard
    shafting is cold drawn in the smaller sizes and turned
    and polished in the larger diameters. It has a smooth
    surface, is commercially straight and is readily
    machinable; suitable and recommended for general
    power transmission and material handling service.
    Special Shafting-While standard shafting is suitable
    for most installations, special shafting is sometimes
    required for certain chemical, temperature or physical
    requirements. Such materials as high carbon steel, alloy
    steel, stainless steel, brass, Monel metal, etc., can be
    furnished plain or heat treated. Stepped, flanged, hollow
    or other special forms are available.
    Special shafting should be avoided in favor of standard
    shafting wherever possible because special shafting
    is usually considerably more expensive and requires a
    greater length of time to obtain, which is an especially
    important consideration should quick replacement ever
    become necessary.
    Ordering Shafting-Standard shafting can be obtained
    from most supply houses and dealers who handle
    power transmission material.
    Turning Down Shaft Ends-When necessary to turn
    down shaft ends, use as large a fillet as possible to
    keep the stress concentration to a minimum. The
    radius of this fillet should preferably be not less than
    the difference in the two diameters joined by the fillet.
    The fillet should be finished and polished as smoothly
    as possible to avoid scratches which might start cracks
    and lead to failure of the shaft by fatigue.

    Table 17: Typical Commercial Shaft Tolerances

    Shaft Size Plus Minus
    Up to 1-1/2 .000 .002
    Over 1-1/2 to 2-1/2 .000 .003
    Over 2-1/2 to 4 .000 .004
    Over 4 to 6 .000 .005
    Over 6 to 8 .000 .006
    Over 8 to 9 .000 .007
    Over 9 .000 .008


    Table 18 lists the recommended tolerances for all setscrew locking,
    eccentric locking and D-LOK locking ball and roller bearings
    Table 19: Shaft Tolerances:

    Shaft Size Tolerance, Inches:

    Up to 1-1/2 +.000 -.002
    1-9/16 to 2-1/2 +.000 -.003
    2-5/8 to 4 +.000 -.004
    4-3/16 to 6 +.000 -.005
    6-7/16 and above +.000 -.006
    please visit my webpage:
    http://motorworks88.webs.com/

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