[TR] drill bits

[Nolan]

> 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.