I don't think there is really a standard.  I would guess most would be
either 45 degrees or 30 degrees.

Stick an un-ground tool blank in the hole and measure it?

John

On Sun, Jul 3, 2016, at 12:05 PM, Gene Heskett wrote:
> Greetings everybody;
> 
> This Sheldon lathe came with a boring bar, .750" by about 8" long. One 
> end is broached straight thru for a small 1/4" tool, while the other is 
> broached at an angle. I am thinking the angled end would allow me to cut 
> threads about 1/2" closer to the bottom of a hole.  But to do that, I'd 
> need to know this angle so it could be used in sharpening the tool 
> properly.
> 
> Is there a std angle for this broached at an angle end of a boring bar?
> 
> If so, what is the degree of that angle? 
> 
> Cheers, Gene Heskett

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