He has figured out that if you extend the quill, a slot is exposed on ZAY mills such that you can access the bolt that acts as a pin without even removing the spindle from the head. Hot diggidy! So, I read over on the Lathemaster Yahoo Group another fellow is having almost the same kind of trouble. Low and behold Aaron Moss, who was the man behind IH Mills, pops up and says, don’t bother, tool changes will go faster without it. It seems a guy had a problem with his pin and wanted to replace it. It had occurred to me that one could also put a mark of some kind on the spindle, but you’d have to bend down to find the darned mark. If you happen to remember which way the one you took out was oriented, you can stick the new one in just about right and off you go. One of the last remaining slow steps is lining up the key on the R8 holder with the little key pin that’s way up inside the spindle. Since building my power drawbar, toolchanges on the mill have gotten a lot faster. I might try making one on the lathe, can’t be too hard, and just see how I like it. It’s kind of like a miniature slide hammer. I came across this “gravity operated center punch” while trawling the web for something entirely different: This would make it easy to leave a punch mark with hands full. It would have been so much nicer if there was a way to cock it and then fire it later with a light touch. I haven’t had a chance to use it yet, but you have to push it hard to fire the punch. I bought one of the Starrett 18AA center punches that fires itself. I use a little piece of brass lathe stock as a hammer and that helps some. One of the challenges is in wielding the necessary hammer to tap the punch if your hands are already very busy holding proper alignment of about four pieces. I use center punches a lot, particularly as transfer punches. This is a cool gadget, made by Dumore, that goes in your drill press chuck and lets you run tiny little twist bits at 20,000 rpm:
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