Help identify

[bluechips]

Can anyone identify this critter? Mic head is B & S. Numbers on casting body are B-1058 on one side and H within a circle and an M. Part holding mike is adjustable and travels in a slot and can be locked with a thumb screw. Looks to be pretty well made.

 

[4GSR]

That's for setting the tool bit height on a boring bar. Could be for a portable line boring bar or could be for a horizontal boring machine like a G & L or Lucas.

 

[benmychree]

I made a similar one for my Universal horizontal boring mill (sold shop and retired) Do you want to sell it?

 

[FLguy]

For checking roundness, (TIR), of round bar stock.

 

[4GSR]

One way to check if it is for setting a tool bit on a boring bar. Look at the numbers and lines on the mic head. If it starts at 1.3 something instead of "0", you know it's for use on a boring bar. If not, could be for something else.

Can we get a picture of the mic head?