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28th Nov 2018, 04:48 PM #1Diamond Member
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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
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28th Nov 2018, 05:11 PM #2Senior Member
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28th Nov 2018, 05:26 PM #3Member: Blue and white apron brigade
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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).
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29th Nov 2018, 03:26 AM #4
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.m1851Best Regards:
Baron J.
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3rd Dec 2018, 10:34 AM #5Most Valued Member
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- Jul 2006
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- Athelstone, SA 5076
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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
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7th Dec 2018, 09:00 PM #6Diamond Member
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- Oct 2011
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- Sydney, NSW
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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
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7th Dec 2018, 09:02 PM #7Diamond Member
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- Oct 2011
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- Sydney, NSW
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I just read Eskimo and BobL's posts, obviously I'm not an electrician!
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7th Dec 2018, 11:35 PM #8
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.
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8th Dec 2018, 12:34 PM #9Diamond Member
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- Oct 2011
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- Sydney, NSW
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8th Dec 2018, 03:56 PM #10Senior Member
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- Dec 2009
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- Sydney
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- 327
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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