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Old 08-11-2018, 12:47 PM   #1 (permalink)
skiprat's Avatar
Join Date: Oct 2006
Location: In a Skip in Wales
Photos: 227

Default Motor brush failure

Check this out....
For years my little mill has sounded rough....I always put it down to the gears just being noisy...
I have been doing loads of milling the last few days, making a 72 inch belt grinder
Well today it went snap crackle pop and even blew the house power
I figured the speed controller at least would be fried but look what I found...

The motor brush had failed. But check the difference in length....

Anyway, it wouldn't solder so I just tinned the wire and jammed it in the hole. I then secured it with CA...

Hey it works !! The machine runs almost silently !!

I've ordered new brushes...but hey..It works !!
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Last edited by skiprat; 08-11-2018 at 01:06 PM. Reason: Typo
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Old 08-11-2018, 01:34 PM   #2 (permalink)
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I thought that this type of thing would immediately default to repair by duct tape, but I could be wrong. (Perhaps that is a redneck answer, and does not apply on your side of the pond. )
Steve Guzy
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Old 08-11-2018, 01:45 PM   #3 (permalink)
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Steve : Looks like there is more that one way to skin a cat!!!

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Old 08-11-2018, 05:04 PM   #4 (permalink)
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Great work around till the new brushes arrive.....CA....who knew?
Charlie W.
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Old 08-11-2018, 05:58 PM   #5 (permalink)
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Where there is a will there is a way or a family. Never seen a situation like that. It must be a relief to have a silent working mill again.

Kind regards Peter and Wilma.
Penpal Nil Desperandum
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Old 08-11-2018, 06:52 PM   #6 (permalink)
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How does the commutator look?
Proud to be the support staff and enabler of Marla Christensen.
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Old 08-12-2018, 02:00 AM   #7 (permalink)
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Join Date: Oct 2006
Location: In a Skip in Wales
Photos: 227


Pete, it looks ok. There was no burnt segments and the brush was still long enough to stay in the housing.
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Old 08-12-2018, 07:10 AM   #8 (permalink)
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Location: Harrisburg, PA 17112
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Good work skip!

Challenge question: Why does one brush wear faster than the other?

Bonus Question: Why are they called "brushes" (they aren't)?

PS: I know both answers (I think).
Randy S.
Experience, ah, experience; Experience is what you get when you don't have experience!
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Old 08-12-2018, 09:23 AM   #9 (permalink)
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Join Date: Oct 2006
Location: In a Skip in Wales
Photos: 227


Ok Randy...I'll try..

In this instance I think one is substantially longer because it hasn't been used.
I also reckon that the spring tension is/was different, thus one getting ground down more.

Brushes?? Didn't they once use metallic bristle brushes before the advent of carbon types??
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Old 08-12-2018, 09:51 AM   #10 (permalink)
Join Date: Feb 2012
Location: Colorado
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Only luck I've ever had soldering a brush was using high temp silver solder.

If you're lucky, that brush will be the same size as one of the ones you can find in a local hardware store or motor repair shop.

Only uneven brush wear I've had was from a brush sticking in the brush holder because it wouldn't move freely. IIRC, I think the spring getting hung up was the problem, but it's been a long time and I really don't remember for certain.
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