Old school boring tool

Milland said:

That's more typically considered a lathe boring bar, where the cross slide does the adjusting, not the bit within the bar itself.

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crossthread said:

Milland...I completely understand your concern for an endangered species and the use of elephant feet. I prefer a camel toe configuration.

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TGTool said:

Actually I have made a boring bar with a graduated advance, but using a much smaller tool bit and it was a between-centers bar. It amounts to a small cartridge and a 40 tpi thread for a moderately controlled movement.

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rke[pler said:

Look at the bottom of the page here and you'll see that it's very much for a mill:

PDQ Quick Change Tooling | PDQ Marlin Manufacturing

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rke[pler said:

I've got some quick change tooling for my mill, and among the tooling are some old school boring tools. These have holes at the working end for square tools 3/8 and 1/2" with setscrews to hold the tool in place. I've not used anything this old (spoiled with boring heads with micrometer adjusts) and I'm assuming that the idea is to set a tool under size, run a hole, then adjust the tool out against an indicator for the difference to get the hole that you want.

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But I find myself wondering if anyone every made a 3/8" square tool that was micrometer adjustable, sort of like the DeVlieg inserts for their heads?

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TGTool said:

Huh, camel toe? I thought they were more associated with tool hardening, but what do I know?

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