| 摘要 |
A numerical control system for a machine tool comprises a feed speed setting unit, which outputs a signal of a set feed speed of the machine tool, and a feed speed overriding unit, which outputs a signal of a feed speed overriding according to an input of the feed speed overriding. An interpolation unit connects to the feed speed setting unit and the feed speed overriding unit. The interpolation unit determines a command signal of the feed speed of the machine tool by performing interpolation calculations according to he signal of the set feed speed unit and the signal of the feed speed overriding unit. Based upon its calculations, the interpolation unit outputs a target position of each spindle at each sampling time. The numerical control also comprises a main spindle rotational speed determining unit, which connects to the interpolation unit to change the command signal of a main spindle rotational speed synchronously with the change of the command signal of the feed speed when the command signal of the feed speed is changed at the interpolation unit by the signal of the feed overriding unit.
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