One of the devices most prized by gadget collectors, the Curta Calculator is a modern Difference Engine - an entirely mechanical calculating machine capable of great precision.
最受装置收藏家推崇的设备之一，CURTA计算器是一台现代差分机——一台能进行高精度计算的全机械结构计算器。
The relation of the step length of cutting tool with mechanical error when machining curved face in the 5 coordination NC machine, and the calculating formulas are deduced.
讨论了在五坐标数控机床上加工曲面时刀具走刀步长和切削带步长与加工误差的关系并推导了计算公式。
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