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High speed direct connection spindles are commonly used in high-speed machining centers and drilling centers, with speeds typically reaching 12000 revolutions per minute. The rotational speed and cutting force are inversely proportional functions, and basically, the higher the rotational speed, the smaller the cutting force. Therefore, the cutting force of a high-speed direct connection spindle is not as good as that of a belt type spindle. The belt type spindle is more stable and has great advantages in processing workpieces that require high surface smoothness. The machining centers that use high-speed straight spindle are mainly focused on processing small parts and products, without heavy cutting. The high-speed direct connection spindle is supported on a V-shaped frame by two main spindle necks. A cone plug is inserted into the small end, and a precision center rod is inserted into the large end. The spindle is gently moved, and each dial indicator can read various error values, including the radial and end face circular runout of the spindle cone hole and each outer circle on the main spindle neck.
