>Ron: > >Do you still use the pilot hole technique when drilling pinblocks? Does >that change the feed speed philosophy because of less heating up of the bit? > >David Love David, Yes, and yes. I drill 0.25" first, without paying any particular attention to feed speed or bit temperature. I don't smoke it, or turn the bit blue, but a couple of thousandths variation in the size of that first hole won't matter a bit (sorry). The second pass reaming on size will not heat the bit enough to be a problem. Delignit is too dense for me to get good uniformity drilling in one pass, at least with any of the tricks I've tried. Double drilling takes a little longer, but the uniformity is much improved with no other special technique. Ron N
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