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34 Mounting Piping Warning Caution 1. Refer to the Fittings and Tubing Precautions (Best Pneumatics No. 6) for handling Onetouch fittings. 2. Preparation before piping Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to remove chips, cutting oil and other debris from inside the pipe. 3. Wrapping of sealant tape When screwing piping or fittings into ports, ensure that chips from the pipe threads or sealing material do not enter the piping. Also, if sealant tape is used, leave 1.5 to 2 thread ridges exposed at the end of the threads. 5. Use caution when implementing rotating transfer with the pad or workpieces and pads with a deviation in the center of the suction position. Screw looseness due to rotation and pad rotation may cause trouble. Apply screw lock agent as necessary. 6. Avoid operation in rotational direction by using the ball joint pad mechanism. Wear may cause troubles. 7. Flow of an air pressure circuit, clogging, wear, cracks, or deterioration of the pad or buffer sliding failure (wear of the sliding part, scratching, etc.) may cause trouble. Make sure to perform periodic maintenance. 8. A buffer is used to decrease the load applied to the pad (horizontal lifting). A malfunction may occur when adsorbing an inclined surface or the side of a workpiece. 9. After the stroke, make sure that the buffer returns to the initial state before starting the next process. Malfunctions may occur. 10. When pushing a pad to a workpiece, make sure not to apply an impact or a large force. This would lead to premature deformation, cracking, or wearing of the pad. When pushing a pad onto a workpiece, operate within the deformable range of the pad skirt. 11. When adsorbing a deformed or spherical workpiece, it is necessary to adsorb it by pressing onto the pad with a strong force. Even if the workpiece can be adsorbed in the initial operation, deformation, cracks, or wear of the pad may occur at an early stage, causing troubles. Make sure to perform periodic maintenance. 12. Foreign matter may get inside the pad. Although SMC gives full attention to prevent foreign matter from getting inside the product during pad molding, it is difficult to remove foreign matter from rubber polymer completely. Therefore, products with imperceptible fine foreign matter is judged as a conforming product and shipped to customers. 13. There is a possibility of crystallized white powder or exuded liquid on the rubber surface. The crystallized powder is called bloom, and the exuded liquid is called bleed. Bloom and bleed do not affect product operation. This phenomenon is caused by rubber compounding agents, such as a vulcanizing agent, antioxidants, oxidation inhibitors, softeners, parting agents or others, and differs depending on the rubber material. As this phenomenon is influenced by changes in the environment (temperature differences, light (fluorescent light), humidity, etc.), the occurrence time cannot be estimated. 14. Do not obstruct the exhaust port of the ejector. If the exhaust port is obstructed when mounted, a vacuum will not be generated. Also, do not obstruct the exhaust port with the goal of removing the workpiece. It may cause damage to the equipment. 4. Use piping with adequate conductance. Select equipment and piping for the vacuum side which has adequate conductance so that the ejector’s maximum suction flow rate can be accommodated by the piping. Also, make sure that there are no unnecessary restrictions or leaks, etc., along the course of the piping. Furthermore, design of the air supply should be performed while taking into consideration the ejector’s maximum air consumption and the air consumption of other pneumatic circuits. 5. Avoid disorganized piping. Piping which is direct and of the shortest possible length should be used for both the vacuum and supply sides. Disorganized piping should be avoided. Unnecessary length increases the piping volume, and thus increases the response time. 6. Use piping with large conductance on the exhaust side of the ejector. If the exhaust piping is restrictive, there will be a decline in the ejector’s performance. 7. Be certain that there are no crushed areas in the piping due to damage or bending. Vacuum Equipment Precautions 2 Be sure to read this before handling. Winding direction Sealant tape Expose approx. 2 threads B