> Ron, > > A while back you asked if I would try the step drill I am using > (.271 with 1/2" LONG 1/4" diam step) for drilling Delignit blocks, omitting > the usual cooling. > > I had some time, and fooled around with it...as I expected, uncooled, > in delignit, the bit was cooking...uh...that would be too hot (not way > cool in > teenage parlance). > > In the uncooled condition (and unguided) the torque results were > erratic, with a > 40inch/lb variation. Well, that answers that, doesn't it? Good job. Does the cooled step drill produce better uniformity than a cooled "final size" drill in one pass? Ron N
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