Potentiometer components are commonly made of brass, steel, aluminum alloy, nickel-chrome steel or plastic.
Brass and steel shafts shall be plated with shackle protection layer; Nickel chromium steel corrosion resistant, do not need gold-plated protective layer, often used in precision potentiometers; Aluminum alloy also has corrosion resistance, and light weight, cheap, but the strength is worse than nickel chromium steel.
The use of plastic can save metal materials, molding processing efficiency is also higher, for a high voltage product potentiometer insulation shaft and safe function.
Potentiometer shaft structure. The bushing is a cylinder with a rotating shaft, or a screw, which keeps a precise dynamic match. It can form an integral component with the potentiometer base. The potentiometer shaft sleeve with general thread still plays the role of mounting parts.
In the fast potentiometer, the use of ball bearing, its high precision, small friction; Long rotational life. Sleeve material should be easy to print the mouth, the inner hole size precision is high, there is enough mechanical strength, commonly used brass, steel and aluminum alloy and other materials, some also need to electroplate protective layer, but also useful plastic insulation sleeve. Potentiometer base, also known as the base, is the installation and support of resistance body, drainage and collector parts and other components of the base. The base is usually made of ceramic, plastic or metal materials.
For metal glass glaze, metal film and high-power wire-wound potentiometer commonly used ceramic base; Aluminum alloy is commonly used in the base of precision wire-wound potentiometers. Plastic is easy to process into a variety of shapes, mechanical and electrical performance is good, and the price is low, light weight, corrosion resistance, so in the organic synthesis of solid core, synthetic carbon film and general wire wound potentiometer in a large number of use.
The potentiometer base and the bushing are usually pressed or riveted together. Metal blue plates are sometimes pressed into the base to improve the heat dissipation capacity of the potentiometer. Some potentiometer base and matrix are integral components, such as organic synthetic solid core potentiometer.