The mechanical watche is one of the watches with high practical and decorative, which works by the winder of mechanical watch movement to spur the gearwheel to promote the watch dial pointer to walk . It seems that the mechanical watches are very complex with a lot of small parts, but its main working theory is that using the power produced by the winder to drive the pointer mounted on the power transmission gearwheel walking. The balance wheel and gearwheel are two important parts which composed the mechanical watches movements. To achieve the accuracy of the adjustment  clocks’ travel time, the most commonly used way is to adjust the balance wheel, that is to adjust the balance wheel running inertial and balance by the balance wheel own physical attributes, provided screws counterweights or the eccentric weights, etc. The common balance wheel can be seen as follows: bimetallic compensation screw balance wheel, ring balance wheel, balance screw balance wheel, weight balance wheel, balance wheel in tune and so on.

 

For the larger diameter balance wheel, it’s necessary to install the tungsten alloy screw counterweights, because it has a larger moment of inertia, which can be changed only through adjusting the screw. This screw counterweights can choose tungsten alloy as its production materials. The reason is that the tungsten alloy has a high density. Since almost all parts of the watches are small parts, in order to achieve the purpose of counterweight, we must choose the materials which are able to be made into the parts with a very small volume but a high weight. And another reason is that the tungsten alloy has good corrosion resistance, oxidation resistance, so it can keep the parts well for long-term using and will not be rusted to affect the gossamer rotation of balance wheel.