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| ARO Pulse and ARO Pulse Plus nutrunners meet the new demands of assembly operations with high speed rundown of fasteners, exceptional accuracy and consistency in torque delivery, and operator oriented design. A unique hydraulic impulse mechanism - driven by an air motor - applies torque to fasteners with a degree of control not possible in conventional tools. The result is precision fastening, with virtually no over-torquing in critical applications. Tool users benefit from the added advantages of reduced transmission of torque reaction and vibration, as well as improved balance and quiet operation. |
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About Pulse Tools
The impulse mechanism operates by means of a pressure differential, which is developed through the mechanism's rotation around the drive shaft and blade.
When the pulse cycle begins, the blade maintains constant contact with the inner wall of the cylinder during the rotation of the outer mechanism.
The fluid pressure is equal on each side of the drive shaft. By the time the mechanism has rotated 90°, both the blade and the front face of the drive shaft are in contact with the inner wall of the cylinder. At this point, the fluid on the right side of the drive shaft is becoming compressed by thte mechanism's rotation. The compression is what converts the inertia of the rotating mechanism into a torque impulse on the drive shaft, and ultimately to the fastener. |
The degree of compression and impulse is controlled by the hex adjustment screw. The adjustment of this screw controls the amount of hydraulic fluid that is allowed to bypass the compression stage, thus increasing or decreasing the inertia, transferred, and consequently the tool's torque output as well.
Air pressure can move the torque up or down. Decreasing the air pressure not only lowers the torque range but also increases the life of the pulse mechanism. Air pressure should not be lowered to any less than 50-60 psi, as levels below this can decrease the torque accuracy. Increasing the air pressure to above 100 psi is also not recommended. This can decrease the life of the mechanism and the motor. |
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