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How to split drill point!

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ZombiWelder

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#1
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.
 

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Bob Korves

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#2
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

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#3
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

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#4
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.
 
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