German Verder shaft Verder model Verder price

Verder shaft refers to a shaft whose operating speed is higher than the first critical speed and lower than the second critical speed. There are also shafts with speeds higher than the second critical speed. To reduce vibration, this type of shaft should be used when high operating speeds are required. Safety margins must be considered during design; generally, the operating speed is controlled to be >1.3 times the first critical speed, and<70% of the second critical speed. When accelerating a flexible shaft, it must reach and pass through the first critical speed. Due to the presence of various damping factors such as the surrounding medium, support bearings, and internal material friction, if the speed increases rapidly, the shaft deflection does not have time to reach its maximum before quickly exceeding the first critical speed, and the operation tends toward balance.

Verder shaft introduction

A flexible shaft is a device used to transmit rotational motion between two objects that are not fixed relative to each other. It consists of wire rope or coils. Flexible shafts are flexible but possess certain torsional stiffness. A flexible shaft may have no covering; it can bend but does not rotate on its own. It may transmit considerable power, or only motion with very low power. Flexible shafts are commonly used in plumber's snakes. They are common accessories for handheld rotary tools and integral components of rotary tools with remote motors, known as "flexible shaft tools." Flexible shaft tools are frequently used in dentistry, the jewelry industry, and other industrial sectors.

Verder shaft classification

Flexible shafts are divided into 3 types: wound, universal joint, and spring type. 1) Wound flexible shaft: Composed of a wire (or steel strip) core, a hose, and shaft connectors. The wire core is wound from 4 to 10 layers of high-carbon steel wire. The outermost layer is generally left-hand wound, and the torque is mainly borne by this layer. The direction of rotation should be such that this layer tightens (forward rotation); in reverse rotation, it can only bear about 15% of the forward torque. If the outer layer is tightly wound with thick wire, the torque capacity can be increased by 70 to 80%. The structure of a steel strip core is similar to that of a wire core. The hose is mostly made of formed steel strips rolled up, primarily used to store lubricant and prevent dust. Wire core connectors are used to join two shafts, and hose connectors are used to join the support parts of the two shafts. Connectors are integrated with the shaft and hose via welding or threaded connections, available in various types. 2) Universal joint flexible shaft: Composed of many connected joints, such as ball-and-tube joints and yoke-and-spider joints. It can accommodate shaft bending; the more joints, the greater the flexibility. 3) Spring-type flexible shaft: A long cylindrical helical spring with various tools attached to one end for different operations. This type of shaft does not require a hose.

Verder shaft advantages

The advantages of flexible shafts include easy installation, compact structure, convenient movement, and the ability to transmit motion and power over long distances. They are mostly used for high-speed, low-torque transmission, such as driving handheld sandblasters and grinders, automotive tachometers, and starting valves and switches of certain devices. However, flexible shafts have low torsional stiffness. When there are large changes in direction and significant torque fluctuations, the non-uniformity of the driven end speed is also high. Under normal conditions, the power transmitted by a flexible shaft does not exceed 5.5 kW; the torque without bending does not exceed 50 N·m, and the speed can reach 20000 rpm. During use, the speed depends on the shaft diameter and the bending radius during operation. Before use, connectors must be securely fastened, and regular cleaning and lubrication are required. 1) The mandrel maintains a large contact area with the hole, resulting in high positioning accuracy; 2) Uses the elastic deformation of the spring collet to center and clamp the workpiece, providing high positioning accuracy; 3) The fit clearance of the positioning surface affects positioning accuracy; 4) Uses Pascal's principle to elastically deform a thin-walled sleeve for centering and clamping the workpiece, achieving high positioning accuracy with coaxiality up to 5μm; 5) Can reduce clamping deformation of thin-walled sleeve workpieces, improving machining accuracy; 6) Has a positioning interference fit of 0.002mm, achieving extremely high positioning accuracy.

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