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The spindle taper plays a crucial role as the contact surface with tools and tooling systems, and its precision and stability directly affect the machining quality, rigidity, and repeatability of position accuracy in machining centers and lathes. Common taper types include BT, HSK, CAT, and ISO, each differing in angle, dimensions, and structural design. To achieve accurate fitting between the spindle and the tool, it is necessary to inspect the geometric precision and contact quality of the spindle taper based on international standards such as ISO 1947 and DIN 2080. [Inspection Items] ■ Taper Angle Precision: A general requirement is within ±10 seconds. ■ Contact Ratio: It is necessary to have a surface contact of over 70% to prevent unstable machining and the risk of loosening due to point contact. ■ Taper Surface Runout: For high-precision machining, it is generally kept within 2μm. ■ Surface Roughness (Ra): To improve clamping rigidity and reduce wear, a Ra of less than 0.2μm is desired. *For more details, please download the PDF or feel free to contact us.

We would like to introduce the Spindle Vibration Test. To ensure processing stability and accuracy, we measure the amplitude and frequency of vibrations generated during spindle operation and determine whether they exceed specified values. Accurate spindle vibration analysis contributes to predicting failures, extending spindle life, and improving equipment reliability and production efficiency. 【Features of Spindle Vibration and Dynamic Balance Standards】 ■ A critical factor that significantly affects processing quality and equipment lifespan ■ In the industry, dynamic balance accuracy is typically classified into 11 levels based on ISO 1940 dynamic balance grades ■ Proper dynamic balance suppresses spindle vibrations, enhances processing stability, and extends the lifespan of bearings and mechanical components *For more details, please download the PDF or feel free to contact us.

The rotational accuracy of the spindle is an important indicator that affects the operational stability of the spindle and the machining precision. It is usually measured by the radial and axial runout at the spindle tip or the tooling mounting surface during no-load and low-speed rotation. This accuracy greatly depends on the manufacturing precision of the spindle components and the quality of assembly. 【General Standards for Rotational Accuracy】 ■ Runout at the spindle end face ≦ 1μm ■ Runout of internal taper ≦ 2μm ■ Runout measured with a 300mm test bar ≦ 15μm *For more details, please download the PDF or feel free to contact us.

The temperature rise of the spindle is primarily caused by friction heat from the bearings during high-speed rotation, the agitation of the lubricant, and heat conversion by the motor. Excessive temperature rise can lead to displacement or thermal deformation of the spindle shaft, adversely affecting machining accuracy, surface finish, and tool life. To ensure stable operation of the spindle over long periods and consistency in machining, precise control of temperature rise and thermal compensation mechanisms are extremely important. Generally, the temperature changes at three key positions are monitored: the fixed end of the bearing (T1), the movable end (T2), and the spindle motor (T3). [General Standards for Spindle Temperature Management] ■ Temperature rise at the bearing section ΔT ≦ 20°C ■ Temperature difference between T1 and T2 ≦ 5°C *For more details, please download the PDF or feel free to contact us.

Spindle rigidity refers to the ability to suppress deformation in response to external forces, and is typically expressed in N/μm (Newtons/microns). When spindle rigidity is insufficient, elastic deformation and vibrations are more likely to occur during machining, leading to issues such as reduced dimensional accuracy and deterioration of surface roughness. Furthermore, uneven bearing loads can occur, potentially adversely affecting long-term operational stability. On the other hand, a high-rigidity spindle design improves machining stability, contributes to the reduction of machining errors and tool wear, and can maintain high-precision machining quality over extended periods. 【Rigidity Calculation Formula】 ■K = Rigidity (N/μm) ■F = Applied Force (N) ■δ = Displacement (μm) *For more details, please download the PDF or feel free to contact us.