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Other Vintage Household Electrical or Electromechanical Items For discussions about other vintage (over 25 years old) electrical and electromechanical household items. See the sticky thread for details.

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Old 8th Apr 2021, 11:14 am   #1
avocollector
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Default Suppression caps on sewing machine motors - needed?

Got a nice metal bodied sewing machine electric motor 230v 5Amp 30 watt model (think it's Sew brand) to use with a minature lathe milling head (Emco Unimat 3 part) I have. Connected it all up to the mains for a tryout and everything was fine except one of the mains suppression caps went bang with a vengence - ruptured and brown goo everywhere.

How essential are these to supress rf Tempted to not bother replacing it as the motor will be only used in my shed and on a isolating transformer supply.
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Old 8th Apr 2021, 12:49 pm   #2
Sideband
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Default Re: Suppression caps on sewing machine motors - needed?

They might also help reducing brush sparking so reduce brush wear. I'd be inclined to replace them.
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Old 8th Apr 2021, 7:27 pm   #3
G6Tanuki
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Default Re: Suppression caps on sewing machine motors - needed?

I'd definitely replace the suppressor-capacitors; who knows, you might just have a radio-ham or legacy SW/MW/LW-radio-listener living locally who might come round and poke you repeatedly with a pungee-stick if you blot-out his/her radio-reception.
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Old 9th Apr 2021, 12:07 pm   #4
avocollector
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Default Re: Suppression caps on sewing machine motors - needed?

Thanks for those ideas folks - so the answer is clearly yep to replace.
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Old 9th Apr 2021, 10:48 pm   #5
Maarten
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Default Re: Suppression caps on sewing machine motors - needed?

Try to find a polypropylene (MKP) replacement instead of a paper cap which might be old stock and fail again soon.
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