Chapter 15 Oxyfuel Gas Cutting 429 Copyright Goodheart-Willcox Co., Inc. Most welding schools have a designated cutting area with a motorized carriage where students can practice setting up and making adjustments to the cutting outfi t. See Figure 15-35. Many automatic and semiautomatic mechanisms are available to perform cutting operations. Multiple- torch cutting machines are used extensively in indus- try. They cut several exact copies of a desired part at one time. See Figure 15-36. These automatic cutting machines and their torches are moved by variable speed electric motors known as servomotors. Special cutting torches are mounted on a light, rigid rail. These cutting torches, Figure 15-37 can be adjusted to vary the fl ame tip-to-metal surface distance. Goodheart-Willcox Publisher Figure 15-35. This welding school has a well-ventilated oxyfuel gas cutting area complete with motorized carriages for student practice. ESAB Welding and Cutting Products Figure 15-36. A gantry-type shape cutter. One plasma arc and five oxyfuel gas cutting torches are mounted on this computer-operated cutting machine. The required torch movements are programmed into the computer at the left. Goodheart-Willcox Publisher Figure 15-37. An oxyfuel gas cutting torch designed for use on a motorized carriage or gantry-type cutting machine.