402 Section 6 Oxyfuel Gas Processes Copyright Goodheart-Willcox Co., Inc. Only one cutting torch is usually mounted on the carriage. Torch angle, fl ame height, and cutting speed can be adjusted on the carriage. A clutch switch is used to engage and disengage the carriage drive mechanism. An oxyfuel gas cutting torch mounted on a motor-driven carriage is used as follows: 1. Set up the track and carriage. 2. Adjust the torch height so the fl ames are about 1/16″–1/8″ (1.5 mm–3.0 mm) above the base metal. Adjust the torch to the appropriate angle for the metal being cut. Refer to the Torch Position subhead under Manual Cutting. Adjust the forward speed for the carriage. Figure 26-1 suggests forward speeds to be used with various metal thicknesses. This speed may be increased, when possible, with a motor-driven carriage. 3. Turn on the cutting outfi t using the same procedure as for a manual torch. 4. Light the preheating fl ames and adjust for a neutral fl ame. 5. Begin preheating the metal at the edge of the part. 6. Turn on the cutting oxygen when the preheated steel has become orange-red (1500°F/816°C) and engage the forward drive clutch. 7. Disengage the drive clutch when the cut is completed. Disengaging the clutch stops the carriage. 8. Shut off the torch and shut down the cutting outfi t using the same procedure as for a manual torch. Motor-Driven Beam-Mounted Cutting Systems Cutting systems are available to cut multiple parts. Multiple cutting torches may be mounted on the same beam. This allows the motor-driven beam- mounted torch machine to cut multiple parts at the same time. See Figure 26-15. SasinT/Shutterstock.com Figure 26-15. These five oxyfuel gas cutting torches mounted to a beam are making exactly the same cuts with great precision as they are guided by an electronic cutting machine.