Solid Copper Block

[CraigC]

OK, it's not a tool, but I did find it with some old tools... :-)

Solid Copper Block
2 3/8" W x 2 1/4" H x 1 1/4" D
Scale reads:    0    20    50    OIL

Thx,
Craig

[wrenchguy]

a die 4 a oil pressure face?

[oldgoaly]

for making a oil pressure gauge face?

[CraigC]

>> A die for an oil pressure face?

I had thought about that, but wouldn't copper be too soft to act as a die?

If it is such, it would have to be the "master" template for a die since the block is not in reverse -- I know that's hard to see in my pix [sorry]. 

More info:  The block weighs about 2 1/2 pounds (40 to 42 ounces).

Thx for the fast responses.  Keep 'em coming!

Craig C

[oldgoaly]

faces would be .020 or thinner many are done in Aluminum. That would raise the lettering then it would be highlighted with paint. could have been a test sample for the machine shop? but why in copper? The other part of the die could be rubber.

[rusty]

> but why in copper?

Because you can photo etch copper. That was the standard method or making a primary plate for decades for photolithography. (The copper plate then makes a consumable master, and the image is reversed in the process)
 

[superzstuff]

I think it is half of a plastic mold.