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To have them sharpened by someone will probably cost you more than just buying a new one from your local hardware store.
Or, you could buy a Drill Doctor. Or, get the "pro" stuff and do it yourself- bench grinder, diamond wheel, drill bit fixture for correct angle grinding, and a shingle to hang if you want to recoup your expenses.
Not sure why your bits would not penetrate concrete. I had to drill a bunch of holes in my shop floor to mount some equipment, and I didn't want to spend a fortune as it was a one time thing. Went to Harbor Freight, bought their hammer drill and appropriate bits, and it went through the concrete like butter.
To have them sharpened by someone will probably cost you more than just buying a new one from your local hardware store.
Or, you could buy a Drill Doctor. Or, get the "pro" stuff and do it yourself- bench grinder, diamond wheel, drill bit fixture for correct angle grinding, and a shingle to hang if you want to recoup your expenses.
There are Drill Doctors 350, 500, and 750. What is the difference: the MAX drill bit diameter?
Does it make sense to buy a used unit?
Last edited by Maple47; 02-05-2020 at 09:59 AM..
Reason: Added a question.
There are Drill Doctors 350, 500, and 750. What is the difference: the MAX drill bit diameter?
Well, if you're trying to resharpen the typical "masonry bit" I doubt any of these will work; as far as I know they're designed for the standard twist drill point shape. And if you've worn down those "masonry bits" there very well may not be enough material left to sharpen them back to their original point shape, either. I think the "Drill Doctor" units will probably work pretty well for standard twist drills. And cost way more than just tossing your drills that are worn down to a nubbin.
You only get so many sharpenings out of a drill even when it's worn down due to normal use; the web becomes too thick to perform properly. Really skilled tool dressers can thin the web and eke out some more life, but they're using real drill grinders that cost orders of magnitude more than the "Drill Doctor" and they're working in production environments with big super expensive drills - stuff like a solid carbide three flute left hand drill and stuff like that.
Honestly, as a homeowner that also has pretty considerable experience in mass production machining, I just toss 'em when they get dull.
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