Back in my chip-cutting days, much of which was pre-CNC, I always found myself running several machines at a time -typically at least one Bridgeport knee-mill, a 6 xl2 surface grinder and 2-3 manual EDM's. When one is physically and mentally this immersed in the "flow", almost any time-saving device or trick is sought after and used. Because I very-often had to grind many angles on both tooling and electrodes, I made my own one-piece, hardened and ground sine-bar stacks.
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