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sbmathias
01-21-2012, 06:55 PM
Can anyone tell me what this thing is? Front and back shown. Brazed carbides on both halves. Groove on edge looks to be manually ground.
http://img221.imageshack.us/img221/3074/1002900oox.jpg (http://imageshack.us/photo/my-images/221/1002900oox.jpg/)

http://img821.imageshack.us/img821/5878/1002899h.jpg (http://imageshack.us/photo/my-images/821/1002899h.jpg/)

Optics Curmudgeon
01-21-2012, 07:09 PM
Adjustable spade reamer, used to use them all the time on screw machines. "Floats" in a boring bar like holder.

sbmathias
01-21-2012, 07:16 PM
I thought it might be something like that, but was confused as it had no mounting provisions. Could anyone use it? As pictured it is about 2.5" across

flylo
01-21-2012, 07:24 PM
I just bought a screw machine. What do you want for it?

sbmathias
01-21-2012, 07:30 PM
If you can truly use it, you can have it. PM me with your shipping info. US only.

DR
01-21-2012, 08:58 PM
The floating adjustable reamer heads of this type I'm familiar with were made by Madison Tool Company, so the name "Madison Reamer" became our generic designation. It been a long time since I played with one, but I don't recall the serrations on the mating faces, seems like there was something like mating grooves instead.

Also, there may have been tiny screws to adjust the diameter. Diameters of +/-.0005" in brass were reasonable to expect.

The grind was kind of tricky, different angles for different materials. We sent them back to the factory for sharpening.

What is shown is worthless without the holder. And, those holders ain't cheep. They're in the category of "if you have to ask, you can't afford it".

Forrest Addy
01-21-2012, 09:17 PM
Looks like a cutter from a Clark reamer. Giddings and Lewis had a tool outfits as a supplier. Stiff arm the bore to get it precislely located and about 0.020 undersized and follwo with the floating reamer and it would cut to 0,0002" of set size.

The roughing tool you show was to bulk out the stock prior to the stiffarm (fixed bar) operation.

That is if it is a Clark product. Several outfits made very similar boring sets but naturally nothing interchanged. .