Ok, good answer but how does a blind man drill two holes in the same place twice when the subject gets moved around a lot. Joiners don't do pin holes. Yeah, yeah, and drill presses don't do joining with Ron Nossaman wrote: > > Richard, Newton, etc, > > >Further I would ask what drilling speed of which drill bit > >type is most suitable for Dilignit type blocks. Polished > >bits, jobber bits, high spiral, low spiral and what speeds. > > This can be made as difficult, critical, expensive, and complicated as you > care to make it. Heck, with a little work and creativity, you can probably > even prove beyond a doubt that Man was never meant to be able to do > something as impossibly demanding as drilling a suitable hole in a Delignit > block. Might get you a statue in the park, or at least honorable mention in > the Curmudgeons' Quarterly. Or, you could duck nearly all the potential > problems up front by abandoning the assumption that the hole absolutely has > to be drilled in one perfect pass, and go with the low tech, no fault, > Uncle Wookie's idiot resistant block poking procedure. Double drill. > > The first pass is with a generic, > anytypethatwillreachfromthechucktotheblock 1/4" or so drill bit. The > rotational and feed speeds are determined by the following criteria: Does > it smoke? Is the bit still turning? If the bit doesn't turn, your feed > speed is too high. If it smokes, your rotational speed is too high. Any of > the nearly infinite combinations of rotational speed and feed rates that > makes a hole without smoking is dead-on the performance requirements. > You're not fitting to the pin here, you're just making a hole. In tuners' > terms, it's the finished hole's equivalent of a pitch raise - a pre-hole, > or proto hole if you will. Any damage, trauma, passing offense, or hurt > feelings the block incurs in the process will be reamed out with the second > pass. It will get over it. > > The second pass is a tad more technically demanding in that you must > actually HIT the previously drilled hole with the finish sized bit. This is > rather important. Other than that, you can use a bit from the same > anytypethatwillreachfromthechucktotheblock House of Bits product that you > used to make the pre-hole. You can even use the same rotational speed, > maybe slowing the feed speed a tad (another technical designation, a bit > more than a smidgen) just for the appearance that it's difficult work and > you're paying attention accordingly (in case someone's watching). There's a > lot lower chance of smoke on the second pass, since the flutes of the drill > aren't all clogged with chips, and the bit runs much cooler as a consequence. > > Done this way, it's very difficult to screw up drilling a Delignit block. > It takes imagination, single minded dedication, and in extreme cases, a > committee. I use 6.8mm for the final pass, or 17/64" if It's going > someplace where the climate control is in the realm of mythology. > > >I have long lusted for a mortising tool thinking it could be > >used for a number of things, like unbushing keys? > > > > Newton > > You'd take a mortising tool when you could have a biscuit joiner? > > Ron N spit. Newton
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