Monday, April 27, 2015

Choosing Between Impact Wrench Models



The difference between one impact wrench and another cannot and should not be judged by the price, but by the product quality, which regards, in particular, the raw materials, the impact mechanism and the weight/power ratio.

An impact mechanism which is properly designed and manufactured should have mechanically, thermally and chemically finished surfaces, to make it shock resistant, resistant to wear, tear and corrosion, thus granting long-term durability of the tool; moreover if the individual components have been manufactured with due attention, the noise and vibrations during operation will be considerably and noticeably reduced.

 On the other hand, a low weight/power ratio will make it possible to benefit of the needed torque with an inferior tool weight and this choice is an advantage above all for daily and continuous use in order to avoid overtiring the operator.

 The adjustment and control of the torque are further important aspects. If torque adjustment on the machine depends exclusively on the personal judgment of the opera-tor, on the contrary it is possible to control the torque by mean of torque sockets which are designed to transmit a precise and well defined torque above which the long and narrow waistline of the socket itself will absorb the excess torque of the impact wrenches in order not to damage the screw-nut/bolt joint.

 Last but not least, the quality and shape of the impact sockets is also important. Only high quality impact sockets with the correct angles and tolerances of the inner walls are able to transmit the nominal torque of the impact wrench properly and efficiently without damaging the tool itself.



Impact Mechanism Types and Applications 



 The 2-jaw system 
The 2-jaw system produces a single impact for eachcycle on both jaws and a high torque value. Thissystem also gives low vibration levels. It is presenton small tools and its use is suggested mainly for tightening hard joints.


 
The 3-jaw system 

The 3-jaw system produces a single impact for each cycle on all 3 jaws and a high torque value. This system also gives low vibration levels. This type is suggested mainly for tightening hard joints.


 
The twin-hammer system 

The twin-hammer system produces a double impact for each cycle on both sides of the shaft. The use of 2 oppositely positioned hammers allows any unbalances to be nullified and the vibrations to be absorbed: the result is a balanced impact. Recommended for fast tightening and suitable for elastic tightening.


 
Pin-clutch system

The pin-clutch system produces a single impact for each cycle. The strokes are made by two pins which are pitched directly on the shaft. This creates a balanced impulse and a lower vibration level compared to the previous systems. This system is very quick and has an excellent initial speed. It is extremely suitable for tire shops, to be used in combination with torque sockets.



- An Exerpt from the Dino Paoli 2014 General Catalog