If the model of the power is selected and it meets all the requirements, you should proceed to select a specific product.
You do not need to take the first sentence seller product – so you can buy a tool only the leading manufacturers, who have well-established as a technology, and output controls.
Spend a few test include two or three products. The purpose of these inclusions – definition of assembly quality pex tool collection. Use them to draw important conclusions about how to put gear, how to select the main couple of gears (the Bulgarians), not whether the constriction bearing assemblies, etc.
Include consistently offered products and compare them to the level and nature of noise. At higher quality assembled product noise should be even, without failures and subsequent amplification, without knocking, transmitted to the body.
But the product that is selected by the most smooth noise, you need to expose another test. Turn it on and then set the maximum speed off. Notice how it stops. Reduce speed should be smooth, gradual. With the engine switched off at the last stages stop products are well heard noises all the nodes and links.
The product should not stop as “petrified” or close to it. If this happens, something it did not in order – constriction bearing assemblies, there is no gap in the right gearing, bad “overshooting” with an electric motor and a lot of things to talk about that specifically can only know product design. In this product a lot of energy expended in overcoming resistance to rotation and the motor will quickly overheat, and the probability of failure is high enough. In this case, you must repeat the entire selection of products first.