| 摘要 |
PURPOSE:To correct the reduction of the working precision due to the thermal deformation between a main spindle and a table by allowing a correction-value generator to generate the relative thermal deformation according to operation time and to provide said thermal deformation onto a controller. CONSTITUTION:The working error due to the thermal deformation of the shaft of a grindstone in a grinder, etc. is measured beforehand and registered into a correction-value memory circuit 13. When receiving the revolution signal Hs of a spindle, a control circuit 11 operates a timer 12, which calculates the lapse time from the receiving of the revolution signal Hs and outputs it into a calculation control circuit 14. Then the circuit 14 reads-out the correction data on starting which corresponds to the output of the timer 12 on starting from the correction- value memory circuit 13 and transmits the above-described data correction data into an NC apparatus 15. Therefore, the NC apparatus 15 shifts the shaft to be corrected, by adding and subtracting the correction data portion from the amount of shift of the shaft, and therefore, the generation of the working error due to thermal deformation can be prevented, and the grinder can be operated immediately after start. |
