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Building the C-throat for the Metal Machine requires 10 or 11 feet of 2x4x1/4-inch-wall rectangular tubing. The depth of the C-throat is a matter of personal preference, but since it has to be exceptionally sturdy to avoid flexing, Williams recommends an inside depth of approximately 25 inches-which will allow you to work a 50-inch piece of sheetmetal. The vertical inside measurement will be 111/2 inches. The instructions say to set that measurement at the rear of the arms, and 113/4 inches at the front, since welding will shrink the material and pinch it slightly at the front of the C-throat. View Related Article
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