普通铣床最大缺点之一,是它的直角台(Knee)在重切割时容易扭动,而致台面发生左右摆动的现象当铣刀初开始铣工作品的一端时,这现象尤为明显。图一示一普通铣床草图,由图中即可看到切割力量有使直角台以O—O’線为轴心而扭动的趨势,O—O’的地位约经过切面A—A的重心。 One of the biggest drawbacks of ordinary milling machine is that its Knee is easy to twisting during heavy cutting, and the phenomenon that the table is swung left and right is particularly obvious when the milling cutter begins to mill one end of the work. Figure 1 shows a typical milling machine sketches, from the figure you can see the cutting force has right-angle stage to O-O ’line as the axis of the twist, O-O’ position about through the plane A-A Center of gravity