Q&A for How to Pour Babbitt Bearings

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  • Question
    What is the clearance between the bearing and the shaft? Should it be size on size or a couple thousandths clearance?
    Community Answer
    If it is a split Babbitt, you will have a gasket between the two halves that allow for tightening due to wear. The procedure pretty much leaves it size to size. After you cut the grooves and put it together, it is recommended to grease or oil it up and run it with a small electric motor and belt to wear it in for 24 - 48 hours, which allows you to check for excess heat, and general operating soundness.
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  • Question
    Can Babbit be used to fill between a worn shaft spline?
    Community Answer
    Due to Babbit's inherent softness compared to the metallurgy required for shafting applications, I would not recommend it.
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  • Question
    At what temperature does grade 2 babbitt melt?
    Community Answer
    For babbitt ASTM grad, the melt temperature is 466°F and the pour temperature is 795°F.
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  • Question
    What is the cutting speed for Babbitt for turning and milling?
    Community Answer
    The cutting speed is 700 to 1100 FPM or 200 to 335 m/min.
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  • Question
    Can these be poured in a cold and damp shop?
    Community Answer
    Yes. You should, in all situations, preheat your ladle, bearing housing and machine shaft. This will allow the melted bearings bond to the parts and will drive off any moisture.
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