How to split drill point!

[ZombiWelder]

I posted before about good uses of harbor freight circ saw blade sharpener, but I found an extra use I thought might be worthy, you can split twist drill point grinding against the wrong side of the blade, spinning dust in your face. It ain't much of it though I wore safety glasses and didn't feel any grit on my face thanks to diamond blades. Just grab a fresh large bit and sort of try that split point back grind or whatever the right name is against the disk until it fits. I had good results with 5/8", 1/2" and even smaller bits. I don't think I'm gonna be predrillin for 5/8 and less unless it's a critical hole.

 

[Bob Korves]

Nice job on grinding the split points. HSS has cobalt in it, try not to breathe the dust, wear a protective mask if necessary.

 

[ZombiWelder]

Thank you! I've been a cowboy about health hazards.
Something to note I read on practical machinist all kinds of fear mongering about using diamond wheels on hss. No problems whatsoever, after 6 months of steady use inmho as long as you don't get it hot you perfectly fine.

 

[BaronJ]

I've never been concerned about grinding HSS using diamond wheels. In fact my four facet drill grinder uses one, and thats had some hammer since I built it. I went through just about every drill I had in a sharpening frenzy. I too thin the drill webs using the wheel edge, but I can reverse the motor direction, so getting dust thrown in my face isn't an issue.