The M7150A horizontal-axis surface grinder has the disadvantages of small cutting capacity, high surface roughness of the machined parts and easy to hold the shaft. The schematic diagram of the grinding head is shown in Figure 1. It consists of a front and rear short three-watt dynamic pressure sliding bearing 2 and 4, a two-way dynamic pressure thrust bearing 3, a spindle and motor coupling 5 and an electric motor 6. Front and rear axle
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