Tuning pin drilling? followup

[Ron Nossaman]

> 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