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No2 Jewel Grinder -resto started

Jeff Horton

Jeff Horton

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The Heart of Dixie
Didn't mean to start this quick but I went to check the motor and see if would work. And it did.

before1.jpg


Got the motor running. Next thing I know it looks like this. :dunno:

apart1.jpg


So I decided I might as well press on and get it out of the way.

assy1.jpg


assy2.jpg
 
Nice start on the resto...

I'm curious, though. What are the two pieces that look like drive chains that are laying over the top of the motor core? Are they part of the oscillating mechanism, or what? It looks like the rack & pinion gear does the oscillating, though. Please explain.
 
Man I hate it when a machine just falls apart like that and begs for a little TLC. You certainly have a knack for resto Jeff. Nice job as usual.
 
Jim DeLaney said:
I'm curious, though. What are the two pieces that look like drive chains that are laying over the top of the motor core? Are they part of the oscillating mechanism, or what?
Click to expand...

Bruce Page said:
Jeff, did you ever find any info on it?
Click to expand...

Bruce, I can't find a single reference to this company on the internet. I can find nothing of them or this machine. I even Googled up the address but nothing helpful.

Jim, The chains go over a plate that goes on top of the column and there is a large counterweight that hangs inside the column. The motor, table, etc. attach to that large casting that rides on the column. So the counter weight help to offset that weight and make height adjustments easy.
 
Little more done today.

assy3.jpg


assy4.jpg

​
For the curious you can see how the oscillation works. The motor mounts on top of the black ring. The gear motor in the back drives he cam. If you look righ in the center between the chains that is the cam. I just sat the motor in place for the photo. It has to be cleaned and probably add new leads to the motor.

assy5.jpg

Jeff
 
That's going to be about the neatest OSS I have ever seen when you get it going. I can't even visualize what kind of "Jewels" you would grind with something that large,:huh: (Swiss Watch Jewels)?:rofl::rofl::rofl:

I wonder if there were many of them made? (I guess it would depend on what it was really used for that would determine the demand for that kind of machine). I also wonder if it was called a Jewel Grinder because it used Diamond grinding wheels, instead of because it was used to grind Jewels.:dunno:
 
Nice quick work. Just wondering - is this an oscillating sander? I can't see any kind of oscillating mechanism. It looks like it's height adjustable. If it oscillates, how does it work?
Paul Hubbman

Scratch that - i just saw your new pics with the 2nd smaller motor. I'm still trying to visualize how that makes it oscillate - can you describe it?

Thanks in advance,
Paul Hubbman
 
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Paul it's a very unusual to say the least. You see the gear motor and cam in the center of the disk?

The motor bolts onto this piece. The bottom of the motor has a round metal disk that rides on the cam. This disk is a slip fit in the motor casting. The Armature rests on the this disk with a tapered bearing on the end of the armature shaft.

So, when the cam rotates. The motor armature actually oscillates inside the motor windings. The motor stays stationary, just the armature shaft oscillates. Very odd set up. But it does eliminate the gearbox.

It maybe a couple of days before I get anymore done on this. Finally got some work in! But I will post some photos of the motor and show better how this works as I get to it.
 
An odd set-up indeed, but ingenious! Makes me wonder if "Motor City" had a double meaning - Detroit and a motor manufacturer. It would have been very expensive to build a custom motor for such a small market application otherwise.

Wes
 
Boy Jeff, you are right, no info at all!

I just had a good long look around, and this is the best I could do...........

JEWEL-BEARING GRINDER



Tends lathe that grinds sapphire jewel-bearing blanks flat on both sides: Applies diamond dust to surface of grinding disk (lap). Mounts lap in revolving chuck. Inserts single bearings into cavity at base of holder (rod) and holds bearings against revolving lap to grind them on one side. Mounts several bearings on metal disk coated with adhesive material, and holds disk against lap to grind other side of bearing.
Click to expand...

I'll bet that your machine started out doing something else, and was converted to a spindle sander..........?? :dunno:
 
There are tons of businesses in Detroit called Motor City ____. Motor City Electric, Motor City Casino are a couple that come to mind off the top of my head.
 
I do realize that Matt - honest!:D My point was more geared towards the manufacturer being an electric motor based company versus an equipment focused company. Hence Jeff's problem with finding information on the unit.

Wes
 
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