In my experience it’s by far more cost effective to just buy new drills for anything under 3/8 or so. If you aren’t too worried about your time the smaller drills can be sharpened but for the cost of new ones vs potential issues with badly sharpened drills it isn’t worth it most of the time.
I have used a $4000+ Darex drill sharpener a lot and while it can work really well it is still very touchy and takes a certain amount of “feel” to get it to do a really good job sharpening a drill. Most people that use it struggle to make it work right. I can only imagine the cheaper drill sharpeners are worse yet.
I agree, Darren, the Darex can be tricky if you don't learn and pay attention. But, then, most machine tools are that way. With the old unit I own (much less than $4k, I promise. LOL), it is ALL about getting that drill indexed properly in the manual jig. And, yes, it is a "feel" thing that only experience with the machine will render. Get that right, though, and the drills are as good as factory and sometimes better.
You do this for a living, though, and far more than I ever have, so I'll take my success as fortunate that I stumbled on how to do it right by trial and error. I had to do something, though, and the two guys who taught me what little machine work I know were adamant about not sharpening drills by hand, so I bought the machine. They used some fancy cutter grinder for all that.
On a side note, thinking of Al and Harry sorta makes me a little wistful. These were old-school manual machinists, the two "research machinists" that designed and built stuff for my Big Pharma company's R&D program. Both had engineering degrees from night school, the old school way for vo-tech guys. If they said it about tool work, I believed it. And yet, when I made them each a knife they marveled at that shiny, hand-held crafting where about the only time it saw workholding was to drill holes. And it ended up getting me a job offer from Maintenance to be their stainless polisher for the manufacturing facilities.
While I always preferred the company of the maintenance guys and factory workers to fancy asses with ties, I stuck with the chemistry bench. More bux!
Thanks for making me think of those two. It's been like 30 years or more they're gone.
Happy New Year, Darren. Hope 2024 is banner for Contender!