Another what is it.

[Carguy99]

Have these ( I have three of them) from my late fathers tool collection. He was a machinist if that helps. Not sure what they are. Some type of tooling?

 

[American Locomotive]

Do the black spots appear to be a different material pressed into the steel? Are they magnets?

 

[Carguy99]

Do the black spots appear to be a different material pressed into the steel? Are they magnets?

They are a different material.

 

[Carguy99]

No not magnetic

 

[Motorman55]

Machinists set-up blocks.

 

[larry_g]

Guessing, they might be laps.

lg
no neat sig line

 

[Lassen Forge]

Looks like an oversized 1-2-3 gage block. His being a machinist, it gets my vote.

Google "1-2-3 machinist block"...

 

[B.S.A. (ret.)]

If the dark spots are non-magnetic (brass, etc.) they're probably for use on a surface grinder's magnetic chuck to elevate a workpiece for clearance.

 

[2oolhound]

It's an exercise given to apprentices who have done something bad. Go drill X amount of evenly spaced 1/2" holes through this block. You can go home when you have them all within .050 of centre.

Equivalent to writing lines on a blackboard.

 

[becker_atc]

It's an exercise given to apprentices who have done something bad. Go drill X amount of evenly spaced 1/2" holes through this block. You can go home when you have them all within .050 of centre.



Equivalent to writing lines on a blackboard.

I got the "go cut key stock and practice grinding turning tools" no carbide for me lol

 

[mattblast]

Looks to be magnetic parallels for use on a surface grinder. They transfer the magnetism from the table to the piece being ground. Solid metal won’t work, needs to have these pins in it to transfer the magnetic force.

 

[blueflame6]

go with mattblast, from my experience in the trade........

 

[Carguy99]

I think you guys are right..

 

[orca8589]

Magnetic transfer blocks or spacer blocks for setting up milling & machining tooling.

~Chris