I have d drill doctor. Not very impressed with it. In the beginning, it did a reasonable job on dull bits. After a while, it became less and less accurate. Most of the problem lies with the chuck that you use to hold the drill bit that you are sharpening. It seems to start getting really sensitive to the dust from sharpening. Then it needs frequent cleaning. Overall, I did not like it as much as I thought I would. I also find that it is not good for "custom" sharpening. I hand sharpen according to what I am drilling. Brass, copper, and even Aluminum take less relief than steel and cast. I use a high relief for steel and castings. Then there are special tips for sheet metal. For drilling out broken bolts and studs, I reverse sharpen my bits. Many times, a reverse bit will unthread a broken off bolt. Also, I thought the Drill Doctor was a bit on the expensive side. Mine was around $125. I should have saved the money for a replacement stone for my grinder.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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