The Talking Machine Forum — For All Antique Phonographs & Recordings

Brushes. Worn out on left, new on right...

One last image, then I'll leave you alone for a while

These are the things that get in the way of proper commutation. Everything that isn't a brush or copper needs to be cleaned away & removed.

This is all incredibly helpful, thanks! I'll spend some time this weekend taking the motor apart, and hopefully post some pictures of my own.

Jerry,
That's a great explanation...

Curt A wrote:Jerry,
That's a great explanation...

Thanks!

Martin_esq, glad you're able to start fixing your Grafonola. The electric motors are very nice; I often wish I had a machine with electric power.

JerryVan, thanks for the pictures! This will help; I have a 1914-1916 Emerson fan currently dismantled (I need to get wires for it) and a 1952 Singer black iron sewing machine. The Emerson is brushless, using a rotor & stator for power; I will still make sure to clean everything properly & lacquer it before it goes back in. The motor on the Singer is typical with carbon brushes.

Also, my brother burnt out the motor in his electric saw the other day trying to cut a chunk of cedar; he had been sawing it into planks with a 19th-c. crosscut but managed to mess up the electric while shaping it. When we go to repair the saw motor, this will help a lot.

I've made a little progress opening things up, though I've reached the point where I'm up against some very stuck screws and I need to wait for some WD-40 to hopefully loosen things up a little.

One question I wanted to throw out though - does anyone know how to detach the speed adjustment lever from the motor? I can't see anything that isn't riveted down, and it's quite an annoyingly long lever...

martin_esq wrote:I've made a little progress opening things up, though I've reached the point where I'm up against some very stuck screws and I need to wait for some WD-40 to hopefully loosen things up a little.

One question I wanted to throw out though - does anyone know how to detach the speed adjustment lever from the motor? I can't see anything that isn't riveted down, and it's quite an annoyingly long lever...

IMG_20200411_123938_2.jpg

IMG_20200411_125752_2.jpg

Would removing the screw with the really flat, low head just above the arm assembly, (in roughly the 12 o'clock position), help in removing the arm?

I tried that, unfortunately it looks like the pivot right next to that screw is still affixed, and between that and the two springs either side of it, I can't get the thing to budge.