Trick VII: On the cutting edge

Bench jewelers frequently need to make precise cuts in gold and platinum sheet metal, but a regular wire saw blade just won't do the job. According to Tom Weishaar, JAr Certified Master Bench Jeweler and shop manager of Underwoods in Fayetteville, Ark., wire blades bend and bow as they cut through metal. The lines they cut just don't have the precision that is sometimes required. Here's Tom's solution: Select a safety-edge razor blade and stand it (sharp edge down) on a rough-cut flat file. Using a steel hammer, firmly tap down onto the razor blade's safety edge. This will drive the sharp edge of the blade into the teeth of the file, causing the pattern of the file to be transferred to the razor blade. The result is a very fine cutting razor blade saw-a blade that will cut a true, uniform line without the bowing seen in normal wire blades. For a variation on that technique, try this:
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