some time back i was working at a place that had a drill press. i was trying to drill a hole one day and couldn’t find a sharp bit. man, i hate that.
while searching, i rounded up all the bits i could find and got ~400. all appeared dull and all had rust. this was a place where tools that didn’t disappear were abused.
i had the company credit card to buy some stuff at helpless depot and while there i saw a drill doctor (as advertised by paul harvey ~2002). it was the basic one and price was ~$80 at that time. i bought it and settled in to do the bits. being the basic unit it didn’t take anything over 7/16” i think it was. to do larger bits you had to buy the optional larger-size collar thingy, not sold at hd (factory order).
what a true gem it was. shoulda got the extra collar, but the bossasaurus had already had a couple of cows
over the $80, never mind the future savings (but he didn’t tell me to take it back!).
after sharpening i got to thinking about how to tell the sharpened from used. i got a black magic marker and painted the shiny ends with it. then i knew if the end was shiny it had been used and might need sharpening.
every week i rounded up used bits and sharpened/colored them.
i have a spyderco tri-angle sharpener for my knives. www.spyderco.com
it wil aslo do wood chisels and plane blades. mine is 11+ years old and i replaced the medium grade rods last year for the first time ($15). the triangualr-shaped rods clean up with water and a scotch-bright cleaning pad. the fine rods may outlast me. unit retails ~$60. mine came with a vhs tape along with the destruction sheet. i haven’t tried it on spade bits. the box is multi-position and has brass handguards. i haven’t looked, but their website may have a demo film.