> hi. i'll confess to being ignorant. you should always use lubricant?
> what kind/how much? and could you give me a little info on the drill
> doctor?
Basically, yes. It cools and lubricates. There is the separate argument
about strange metal conditioning properties that I can't agree with, or
dispute. I can say that when I drill/cut/tap with a cutting fluid, the job
goes faster and easier, and the tool stay sharper longer.
While I happen to use tapmatic natural fluid, that's only because I've still
got a bottle laying around. The claims of homebrewed fluids run the gamut
of motor oil, atf, diesel fuel, wd-40, antifreeze, peanut butter, mayonaise,
dish soap, etc. Honestly, probably all of them work well enough to make a
dramatic improvement over dry cutting.
The drill doctor http://www.drilldoctor.com/ can be purchased at home depot,
lowes, and amazon.com. It's a darn good tool at sharpening and resharpening
drill bits. Comes in various configurations, each with slightly more
capabilities and more expense. I have the DD750X because I thought I might
need to sharpen 3/4" bits (haven't yet). I do like the two different face
angles. Reading the manual is confusing, watching the video is an "ah-ha!"
moment. From about 1/4" down it gets progressively harder to sharpen.
Somewhere around 1/8 I get defeated and do it by hand.
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