Micromechanics, Part II

With our first exam out of the way we turned to our lathes. Before you can turn on the lathe however, you need sharp gravers. We were given a dozen gravers with beautiful diamond shape lozenge tips and then our instructors took them to the grinding wheel and squared them off. Using only an India Stone and an Arkansas stone we were to get them all back to beautiful symmetrical lozenge shape gravers. We did this for a full week. We had blisters on our hands and our arms were sore, but I can sharpen gravers without even thinking about it now.

With sharp gravers in hand we pulled out the lathes. Our first project was to make a set of pushers and anvils (out of brass) for our Horia Tool. Because they need to fit into the tool nicely and be perfectly centered tolerances were +/- .03 millimeters for the bases and the pushers had to fit perfectly into the top of the tool without falling out (2.99 mm exactly). We also made (from steel) an anvil and pusher specifically for tightening cannon pinions.

Having learned the basics of turning we started making winding stems. Finally, a watch part. The stems include turning, forming threads, hardening and tempering steel, polishing, and filing a square. We made about 10 of them, each one with unique dimensions and progressively getting smaller. The most lenient tolerances were +/- .05 mm and the diameter of the pilot was +/- .01mm. The winding stem segment culminated with two exams, the LWT exam and an intermediate WOSTEP exam.

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