On 8/21/2012 8:30 AM, Jim Ialeggio wrote: > Ron Said: > > <A piloted counter bore, used for making a fastener head bedding surface > > ok. Though you must have turned your own pilot to get a 1/4"-ish pilot > on a 7/16 OD counterbore...no? Must I? No, actually, I rummaged through a big bin of them at my local surplus yard thirty years ago, caliper in hand, and found what I wanted. Cost me maybe ten minutes and a couple of bucks. I didn't have a lathe at the time, but making a pilot wouldn't have been all that tough on a drill press either. I haven't looked, but since there seem to be billions of pilots knocking around, I expect they're available commercially too. Ron N
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