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Old 24th Aug 2023, 10:23 am   #1
Tractorfan
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Smile Very old motor

Hi,
I thought you may be interested in this ancient motor of (almost) local manufacture I found for a few euros. It's a commutator motor with cylindrical brushes the seem to rotate as it runs according to the wear on them. Whether by design or otherwise I know not.
The bearings are lubricated by a wick immersed in oil cups and it was supplied via two terminals on the base plate and had a straggly bit of twin flex. No earth, of course! The whole thing is cast iron cased.
It runs well after fettling but was never balanced, so I'm wary of running it up to full speed!
Cleaned and rewired, it now looks a bit tidier and safer.
Cheers, Pete.
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Old 24th Aug 2023, 11:38 am   #2
The Philpott
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Default Re: Very old motor

Proper lubrication!
-Just pondering how one would go about balancing this without the proper equipment.. can't rely on seeing where it stops after repeated runs, as the ancient bushes and brushes would spoil the results.

Dave
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Old 24th Aug 2023, 1:37 pm   #3
NottsIan
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Default Re: Very old motor

Dave,
You'd balance the armature supported on two knife edges.

Ian
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Old 24th Aug 2023, 5:36 pm   #4
The Philpott
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Default Re: Very old motor

Ah yes. I had in mind a perfectly level black & decker workmate with the top opened out but i can see how a couple of clamped steel rules would be better.

I wonder if it was an off-the-shelf item or whether it had a specific application.

Dave
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Old 24th Aug 2023, 5:40 pm   #5
G.Castle
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Default Re: Very old motor

I've seen similar driving a vintage sewing machine.
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Old 24th Aug 2023, 7:09 pm   #6
Ed_Dinning
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Default Re: Very old motor

Similar types were used on early dentists drills with a "string " drive cord

Ed
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Old 25th Aug 2023, 8:11 am   #7
G6Tanuki
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Default Re: Very old motor

I remember similar motors being used by the sort of pantograph engraving machines they had in jewellery shops, places that engraved dog tags, sports trophies etc.

I was always fascinated by the geometry of the pantograph linkage that transposed the letter stencilling from a flat surface to the curved surface of something like the circumference of a sports trophy cup.
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Old 28th Aug 2023, 3:54 pm   #8
broadgage
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Default Re: Very old motor

Similar motors have been used to belt drive a large fan such as for a forge or furnace.
This was a "high value" use of electric power since it saved employing a second person to work bellows.
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