By John G. Webster (Editor)

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Automatic tool changer (or automatic hand changer): Unless the host robot is occupied with the same task, it is convenient to have a supply of different grippers and the ability to switch between them as tasks change. A robot arm exchanges grippers by using a turret or a tool changer. A turret is limited to switching between only two or three grippers whereas a tool changer handles a large number of grippers. In an automatic tool changer, each tool has a common mechanical interface through which the power source and the sensor signals are transmitted.

In reality, the temperature rise is easily several tens of degrees when the actuator is not appropriately cooled or when heat is generated by a welding torch or heat-emitting device. 1 mm. Thermal expansion is often forgotten by many robot designers. In manufacturing semiconductors and precision machining, however, compensation for thermal expansion is unavoidable. An easy solution to the problem is to keep the ambient temperature constant because it is quite difficult to achieve accurate compensation.

However, a hydraulic drive may exhibit dynamic behavior that is quite oscillatory. The main drawback is possible leaks in the closed oil-flow system. Pneumatic drive systems are quite effective when a large force is not required and a simple open/close operation suffices. They also do not require return circuits as hydraulic drive systems do. The main limitations are low positioning accuracy, low rigidity, and exhaust noise. Another concern closely related with choosing the power source is cables or hoses.

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53.Robotics and Automation by John G. Webster (Editor)


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