Spindle System
By CHUMPOWER  2017/04/07
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What is the Spindle?

It is the rotating shaft driving the workpiece or tool to be machined on the machine tool. It normally comprises of components such as the mandrel, the spindle bearings, and transmission components mounted on the shaft.

Power Transmission Mode of the Spindle

The power transmission of the spindle can be classified into the following types: 
1. Gear Transmission
Advantages: Allows greater torque output when used with a gear box, suitable for heavy cutting processing
Disadvantages: When gears are in motion, there is a lot of vibration, noise and heat generated, unsmooth high-speed rotations.

2. Belt Transmission
Advantages: Has smaller vibration as compared to gear transmission for easy assembly
Disadvantages: The belt has a tendency to slip at high-speed transmissions, minor installation errors can generate a lot of vibration and noise, or lead to large spindle deviations.

3. Direct Transmission
Advantages: Rigid connection for higher machine efficiency
Disadvantages: Unsmooth high-speed rotations, large spindle deviations, poor processing precision.

4.Built-in Motor Transmission
Advantages: Low vibration, high-speed rotation, high processing precision
Disadvantages: Large bearing span, poor rigidity, the heating of the coil will easily cause the spindle to increase in temperature.

Spindle and Tool Clamping System

Series-connected and parallel-connected disc spring combinations connected through the lever are used to grip the bolts of the tool handle with the clamping segments, allowing the diagonal surface of the tool to be in close contact with the diagonal surface of the spindle bore and forming sufficient interface rigidity.

Gripper Types

Ordinary type grippers are classified into BERG, OTT, and ROHM, amongst which BERG grippers are external jaw grippers while OTT and ROHM are internal jaw grippers. Pneumatic grippers are suitable for use with short spindles that require high-speed heavy cutting or precision cutting. Pneumatic grippers are also classified into external jaw and internal jaw grippers. The most common type of internal jaw grippers is the HSK series.

Gripper Assembly

CHUMPOWER Shaft System Accessories:
1.All the above materials are composed of alloy steel.
2.The gripper is manufactured in accordance with the Pull Stud Type JIS6339 (MAS 403) standards.
3.Integral individual clamping segment design, suitable for spindles of varying speed rotations
4.Gripper surfaces have undergone wear resistance and corrosion resistance treatment. Through the life cycle testing machine, the tensile strength can withstand up to 1000 Kg for 1 million times. (**e.g. BT40)
5.Easy disassembly design, suitable for use with spindles of various models
6.Synchronous use of OTT, BERG, and ROHM standards.
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Sources: PMC技術簡報、大葉大學教學簡報、內部教育訓練簡報

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