That conical shape won't work very well, but they have
another cut that will.

I've recovered a broken 3/4" drill I got for free.
I first turned it like that and then cut the cross point.
Another one, I corrected to that form and then hand ground
the flats on it.

What is the other - cross point ? something like that.

Martin

On 5/7/2012 8:54 PM, John Doe wrote:
http://www.flickr.com/photos/27532210@N04/

A bit after sharpening.