The Ford Barn

old31 · 05-20-2017, 02:23 PM

Curious minds want to know.

Why is the 3rd arm a smaller brush than the other two? I would think Henry would find it easier to install and inventory the brushes if they were the same size.

What would happen if all 3 brushes were installed with the size of the larger brushes?

Tom Wesenberg · 05-20-2017, 04:21 PM

I've seen all 3 installed the same size, though it's not correct. The third brush supplies the current to feed the field windings, and this is fewer amps than the generator needs to put out, so the brush can be thinner. Every penny saved adds up, is the only reason I can think of for it to be thinner.

Gunmetal blue2 · 05-21-2017, 12:41 PM

my rebuild kit had all the same size. the old one that was on it the one you use to a just the voltage tends to ware down more then the other two.

old31 · 05-22-2017, 06:12 PM

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OK, thanks.

05-20-2017, 02:23 PM	#1
old31 Senior Member Join Date: Jan 2016 Posts: 2,460	Generator 3rd arm brush size? Curious minds want to know. Why is the 3rd arm a smaller brush than the other two? I would think Henry would find it easier to install and inventory the brushes if they were the same size. What would happen if all 3 brushes were installed with the size of the larger brushes?

05-20-2017, 04:21 PM	#2
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Generator 3rd arm brush size? I've seen all 3 installed the same size, though it's not correct. The third brush supplies the current to feed the field windings, and this is fewer amps than the generator needs to put out, so the brush can be thinner. Every penny saved adds up, is the only reason I can think of for it to be thinner.

05-21-2017, 12:41 PM	#3
Gunmetal blue2 Senior Member Join Date: Apr 2013 Location: Columbia, TN.38401 Posts: 422	Re: Generator 3rd arm brush size? my rebuild kit had all the same size. the old one that was on it the one you use to a just the voltage tends to ware down more then the other two.

05-22-2017, 06:12 PM	#4
old31 Senior Member Join Date: Jan 2016 Posts: 2,460	Re: Generator 3rd arm brush size? Sponsored Links (Register now to hide all advertisements) OK, thanks.