These two photos show the dovetailed channel to fit the QC toolpost. I machined dovetails in the back so it fits directly on to the QC post, rather than some that I have seen which bolt into a tool holder. I found a suitable block of 4140 in the scrap box just waiting to be useful. "One of those days" arrived when I had some long holes to drill and it seemed like it might be much quicker to clear the flutes using a toolpost mounted drill bit, as it was something that was on my list to make one day I thought that I would make one before doing the holes. Out of curiousity I had intended to try one anyway, one of these days. However, QC (quick change) toolposts have partially removed that objection. I saw some advantages but they never seem to justify the extra hassle of setting up when you needed it. Toolpost mounted drill chucks are nothing new, but I had never been enthusiastic about the idea, although I had never tried one, except on a turret lathe.
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