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[Tom]

Evening folks,
Sorry if this is too OT, but it is regarding my garage bench grinder that I am really missing now that it no longer works. It is always used to clean up Land Rover parts.
It is an old bench grinder that I inherited when I bought my house, but being built many years ago, it was built to last rather than modern ones now. If it is truly broken and I need to get a new one, then I will do, but would rather try and replace it.
Sparkyxm had kindly offered to take a look once lockdown is over, which is greatly appreciated but want to try and get ahead of the curve and rule out the obvious first.

The bench grinder usually trips the power when first turned on - it starts to spin up to speed and then trips. I often have to reset the fuse 3/4 times before the grinder comes on and stays on. Recently it has just stopped working entirely - I was using a wire wheel with it, and it just seemed to lose all spinning force (as in lightly pressing on the wire wheel would stop it turning - it’s usually very strong).

Anyway, I am going to start by looking at the electrolytic capacitor that is fitted. The original one is manufactured by Daly, and reads:
Daly
Electronic Capacitor
124-138 MFD
110v RMS MAX WKG
150v RMS MAX SURGE
INTERMITTENT
MSDA 8S

Anyone have any ideas where I might be able to source a modern replacement for this one please? I’m hoping that the tripping on start up may have been down to a faulty or weak starting capacitor?
Thanks  (and please delete if deemed too OT)

[geoff]

Is your " fuse " an MCB  ??  Not unknown for these to fail ( swapped a few out in work ) can you substitute one to test it 

[autorover1]

RS Components   https://uk.rs-online.com/web/p/aluminium-capacitors/2508854013/
Details - https://www.alliedelec.com/product/cornell-dubilier/psu13035a/70186051/

[Tom]

Hi Geoff,
Thanks for the reply, yes, it is an MCB, although I have already swapped this for a known good one with the same results. Also, nothing else has ever tripped the MCB in the last 5 years other than the grinder so I'm more inclined to think that is where the problem lies.

Autorover, thanks so much. It's a bit of a minefield out there, and with the change in units as well, it makes it tricky for me to work out. Knew someone on here would be able to point me in the right direction.
Thanks again
Tom 

[Formerlyjeremy]

My small Clarke grinder failed - wouldn't run and even if I "helped" it it wouldn't continue - so I wasn't convinced it was the capacitor.

However seemed worth a punt for about a fiver - so got a similar capacitor from an e-bay seller - fitted it and its fine.  Capacitor on mine is in the base.  The original one had small Lucar connectors - the new one big - so be aware.

[autorover1]

I just wonder if the 124-138 MFD on the original is an old designation for microfads (abbreviated uF or mfd) so the one on RS website is in a similar  range.

[Wittsend]

That would be my interpretation too ... MFD = microfarads

 

[Kernowcam]

Try eBay.
Note the dimensions and tag fittings
I have  a local motor repair place who were really helpful last time I went here. He identified and posted me the right one.
Only about £8