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meho
04-23-2008, 07:23 PM
Anyone have an idea? They are made by B&S. The only markings are U-38-1.
http://www.mindspring.com/~abodom/mystery.jpg

Doc Nickel
04-23-2008, 07:30 PM
Isn't that an arbor for a grinding wheel balancer? The kind that uses two horizontal "knife blades" for the arbor to roll on?

Doc.

JCD
04-23-2008, 07:55 PM
My best guess is: a machine tool replacement part of some kind. Brown & Sharp manufactured a lot of machine tools for a lot of years.
I could be wrong, it happens frequently.

lazlo
04-23-2008, 07:57 PM
It looks like it might be a grinding spindle.

Balancing arbors usually have a taper section so you can balance wheels of difference sizes.

oldtiffie
04-24-2008, 01:22 AM
I can't tell what it is but I can tell you that it isn't a grinding wheel balancing arbor.

A balancing arbor is a single precision-ground shaft that fits the locating taper in a grinding wheel balancing hub.

All or most balancing arbors and balancing procedures are similar in principle if not in detail.

I've included 4 pics of my set-up for my surface grinder.

This is my balancing arbor with a grinding wheel on a balancing hub.
http://i200.photobucket.com/albums/aa294/oldtiffie/Grinding_Wheels/Wheel_balance2.jpg

This is the arbor on my "Home-made" "knife edges".
http://i200.photobucket.com/albums/aa294/oldtiffie/Grinding_Wheels/Wheel_balance1.jpg

This is the wheel on the arbor on the knife edges.
http://i200.photobucket.com/albums/aa294/oldtiffie/Grinding_Wheels/Wheel_balance3.jpg

This is a selection of pre-used or pre-balanced wheels on their balancing hubs in the drawer where they are kept.

http://i200.photobucket.com/albums/aa294/oldtiffie/Grinding_Wheels/Wheel_balance4.jpg

Items previously posted on wheel-balancing are at:
http://i200.photobucket.com/albums/aa294/oldtiffie/Grinding_Wheels/Grinding_wheels5.jpg

http://i200.photobucket.com/albums/aa294/oldtiffie/Grinding_Wheels/Grinding_wheels6.jpg

http://i200.photobucket.com/albums/aa294/oldtiffie/Grinding_Wheels/Grinding_wheels7.jpg

torker
04-24-2008, 01:32 AM
So tiffie.. any idea why they don't make the wheel balancers like the prop balancers I used to use for RC planes?
Had an arbor that fit on four wheels... similar to your setup but with wheels instead of knife edges. The wheels are right together so the shaft stays in place. I could explain it better but have to get up at 5 so I'm outta here!
Russ

oldtiffie
04-24-2008, 01:50 AM
So tiffie.. any idea why they don't make the wheel balancers like the prop balancers I used to use for RC planes?
Had an arbor that fit on four wheels... similar to your setup but with wheels instead of knife edges. The wheels are right together so the shaft stays in place. I could explain it better but have to get up at 5 so I'm outta here!
Russ

Thanks Russ.

They do make and use those "4-wheeler" balancing kits and they work quite well. But you have the friction of 4 wheels to over-come where-as the knife edge type setup has minimal friction.

Th 4-wheeler will appear in just about every text book on wheel-balancing.

But whether "knife-edge" or "4-wheeler" the principles are the same.

winchman
04-24-2008, 03:31 AM
It looks like this:
http://www.rcuniverse.com/magazine/reviews/695/IMG_2279.jpg

It's an extremely versatile tool. You can invert one of the disc holders, and put larger items outboard of the fixture.

http://www.donshobbyshop.com/newimages/PropBalance.jpg

Roger

torker
04-24-2008, 08:34 AM
Roger.. yup that's the one. I wish I never sold mine. Could use it for a few things around the shop for sure.

lazlo
04-24-2008, 10:16 AM
So tiffie.. any idea why they don't make the wheel balancers like the prop balancers I used to use for RC planes?

They do Russ -- Anderson Balancing Ways:

http://reliabletools.cachefly.net/itemimages/AprilV08/v17i.jpg

There's a third type of machine-tool balancing way -- the Okuma/Grisholt-style, which is set-up like a scale. This is a Chevalier (Taiwanese) copy:

http://www.normanmachinetool.com/products/02_05_08_B15-0301_01.jpg

J Tiers
04-24-2008, 10:53 PM
The friction issue is WAY overblown.............

The wheels are normally quite large, the ball bearings small, and the effective friction essentially nonexistent.

probably FAR less than the challenge of getting the knife-edge ways perfectly level.

Naturally, level doesn't come into it much with the wheels.