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Thread: Motor Noise

  1. #1
    Join Date
    Nov 2008
    Location
    Perth WA
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    Default Motor Noise

    Hello All,

    The motor driving my lathe has developed a cyclic clicking noise, The motor is a 750 watt Brooks Crompton single phase, capacitor start, capacitor run model and has run flawlessly for the past 15 years or so

    I will pop the end plates off for a squizz probably tomorrow. Any suggestions as to what might be amiss?

    Bob.

  2. #2
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    Default

    Depending on whether the clicking is happening quickly or slowly, check the belt as there may be a hard spot or embedded swarf causing the noise.

    Michael

  3. #3
    BobL is offline Member: Blue and white apron brigade
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    Feb 2006
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    Perth
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    Default

    Change the gears and see whether the click frequency changes, If it does it won't be the motor or the primary belt/pulley but something else in the drive train

  4. #4
    Join Date
    Apr 2008
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    NSW
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    Default

    I would take the drive belt /s off first and then run the motor . See if it stops . If it don't put a screwdriver handle to your ear and the blade end on the motor in different places as it's running . If it stops clicking place a load on the motor pully with a piece of wood as a brake lever . If it starts again it could be a bearing . If it seems all normal it must be further along the drive chain . If it's inside the motor it could be a switch system some have at the fan end of the motor or a bearing problem .
    The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.

  5. #5
    Join Date
    Nov 2008
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    Perth WA
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    Default

    I realise now that the thread title should have been "Beltless Motor Noise".

    The noise seemed to be emanating from the motor's centrifugal switch mechanism but on disassembly I could find no apparent problem. The bearings were not as smooth running as they should be so I replaced them with a fresh pair of shielded Nacchis. Some of the bindings on the exposed windings had broken so I re-tethered them with bootmaker's linen thread and 5 minute Araldite. On reassembly I noticed that the rotor could move a few millimeters axially in the end caps. I have another Brooks Crompton motor, a 1/3hp version that has unventilated end caps but other than the lack of holes, look the same as those on the 1 horse motor. Removing the rear end cap revealed a wave and a spacer washer behind the bearing. For some unknown reason those parts were absent in the lathe's motor. The 1/3 hp motor became a donor.

    Assembled yet again and remounted on the lathe with the pulley and belt in place, the motor runs smoothly and quietly.

    Thank you all for your suggestions.

    Bob.

  6. #6
    Join Date
    Apr 2008
    Location
    NSW
    Posts
    537

    Default

    That's good , those centrifugal switches are a source of problems .
    The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.

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