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The rocker plate and rocker thus permit the cutting edge of the cutting tool to be raised or lowered. When the cutting tool has been properly positioned, a setscrew is tightened to clamp the cutting tool rigidly. 32 GUNSMITHING AND TOOL MAKING BIBLE USE OF FORM TOOLS In lathe work, form tools are used for form turning, producing short tapers, thread chasing, and other applications. If a form tool is to reproduce the special contour of its cutting edge on the work piece surface, it is important that the cutting edge should be adjusted so that it is at the same height as the rotational axis of the work piece.

First, I would start with a 1 1/8 inch x 26-inch long piece of 1350 or stress proof. This steel will drill, ream, and rifle beautiful, and almost never gives any trouble. The first thing to do is to put this bar in the lathe, face off one end, and center drills it. On the other end, it is best to face it off also. Make sure that the end that you center drilled is flat and smooth. After the barrel is faced off, leave it extended, from the chuck about 6 inches. If the barrel is sticking from the end of the lathe, make a collar, with four setscrews, so the barrel can be centered and rigid.

You should have a 1/4 inch needle valve to adjust the gas to air mixture. Using Butane or Propane from a 5-gallon bottle works better as there may not be enough pressure from natural gas. If you use butane, make sure all your fittings, and hose are for high pressure. It has rubber ends that will fit on the gas nipples at each end. Any other good rubber tube can be used, such as a 3/8-inch garden hose. The mixing tube must be long enough so that the gas and air are thoroughly mixed by the time it gets to the burner end.

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