Welding, automatic machine operators

Mechanical scenarios are mai r. They include metal presses, buzzers for dressing or planing timber, lathes and drill presses. Automatic or semi-automatic systems include contact or spot-welding machines on vehicle production lines, either controlled by an operator or fully robotic, automatic control of chemical process facihties such as oil refining (with a manual override), car cruise control and aircraft autopilots. Mechanical systems place large amounts of energy at the operator s disposal so a high-powered car and an inexperienced driver can be a fatal combination. 

Semiautomatic and automatic pneumatically or hydraulically operated machines can be used. Ftessure controls are required for melt, weld, and clamping pressures. Accurate timers are also required for cycle control. High production runs may use feeding, clamping, and ejection from a conveyor belt where the application permits. 

The direct heat welding operation can be completely manual, as in the case of producing a few prototypes, or it can be semiautomatic or fully automatic for fast, high-volume production. For automated assembly, rotary machines are often used where there is an independent station for each of the following processes ... 

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