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  1. #1
    Join Date
    Oct 2011
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    Default Start Up Capacitor - Where to buy?

    Hi,

    I think the start up capacitor on my lathe has died.

    I want to replace it but not sure where to get one from. I've looked at ebay and came up with this:

    https://www.ebay.com/itm/Appliance-M...A/272321181127

    Local seller and its seems to match what I have. I've tried electrical retailers online but I'm struggling to find anything else.

    Any suggestions?

    Thanks Ben.StartCap.jpg

  2. #2
    Join Date
    Jan 2012
    Location
    Melbourne
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    149

  3. #3
    BobL is online now Member: Blue and white apron brigade
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    Default

    The main thing to match is the "Capacitance" in microFarads (MF) it should not be more than ~20% higher or lower that the original
    Voltage wise , equal to or higher is OK.
    Likewise with the max temperature rating (more is OK but not less).

  4. #4
    Join Date
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    York, North Yorkshire UK
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    Default

    Hi Ben,

    If you are not in a hurry, this looks OK. Wire end rather than amp tags but just use a chocolate block to join the wires.

    https://www.ebay.com/itm/Black-100uF....c100005.m1851
    Best Regards:
    Baron J.

  5. #5
    Join Date
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    Athelstone, SA 5076
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    Default

    as BobL says make sure you get one at least close to 120mfd...200 is way too big

    as Niel says...Actrol, Heatcraft or Airfrige would most likely have one, but ebay should be cheaper

  6. #6
    Join Date
    Oct 2011
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    Sydney, NSW
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    Default

    Hi,

    I bought the ebay one in the OT. It was a lot bigger than the original one but it still fitted in ok. I fired it up today - was very nervous. It worked and I'm still alive! It seems to me that the start up seems less sudden than before. Is this possible?

    Ben

  7. #7
    Join Date
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    Default

    I just read Eskimo and BobL's posts, obviously I'm not an electrician!

  8. #8
    Join Date
    Sep 2012
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    Default

    Hello Ben,

    The bigger capacitance will have a lower reactance (AC Resistance) than the original. This will increase the start up current through the start winding resulting in the softer start. As long as it gets up to speed quickly, it should be allright, the centrifugal switch will open the circuit, disconnecting the capacitor and start windings from the supply voltage.
    Best Regards:
    Baron J.

  9. #9
    Join Date
    Oct 2011
    Location
    Sydney, NSW
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    Default

    Quote Originally Posted by BaronJ View Post
    Hello Ben,

    The bigger capacitance will have a lower reactance (AC Resistance) than the original. This will increase the start up current through the start winding resulting in the softer start. As long as it gets up to speed quickly, it should be allright, the centrifugal switch will open the circuit, disconnecting the capacitor and start windings from the supply voltage.
    Yep, its gets up to speed quickly but it doesn't give that sudden violent shock I used to get when starting up.

    Ben

  10. #10
    Join Date
    Dec 2009
    Location
    Sydney
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    Default

    Might e too late, but Hare & Forbes had big fat 75uF / 250v units for $2 each. Down the back, at the clearance section.
    regs,
    A.
    'Waratah' spring hammer by Hands & Scott c.1911- 20, 'Duffy, Todd & Williams' spring hammer c.1920, Premo lathe- 1953, Premo filing machine.

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