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How To Cut Perfectly Round Holes In Box Steel Or Flat Plate
Lyle Bruns, Ly-Mar Mfg., Tower Hill, Ill. 62571 (ph 217 567-3675): Lyle came up with a method of cutting perfectly round holes in box steel or flat plate. He made an attachment for his cutting torch that has a pin under it to center in the proposed hole. Distance between the pin and the end of the torch is the radius of the hole.
  The work table mounts on a old car wheel, fitted with a hub that attaches to a pedestal made from a pipe.
  To cut a hole, he first drills a small hole in the center of the proposed hole into which he inserts the radius pin. He then simply rotates the wheel to cut out the circle.

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2001 - Volume #25, Issue #5