Vain imaginings of having a boring mill....

[Batmanacw]

Am I missing something here?

Could you mount an adjustable insert holder at 20 inches on a 45 in long 2 in. bar, put a center in the far and and supporting the far end with a dead center, bore (or clean up a cast ) hole through an 18" piece of stock?

Ie., suport the far end?

I no longer have a lathe so cost of material is zip.

You might want to check my other thread about line boring. This one is about mimicking a boring mill.