Numerical control apparatus for machine tool and numerical control method for machine tool

A numerical control apparatus for machine tool, comprising:

• an NC program storage portion for storing an NC program generated for machining a material into a desired shape;
• a block skip command detection means for detecting whether a block skip command for skipping execution of blocks after a position where the block skip command is described is present in said NC program stored in said NC program storage portion or not;
• a block skip end command detection means for detecting whether a block skip end command provided in connection with the block skip command to permit execution of blocks after a position where the block skip end command is described is present in said NC program stored in said NC program storage portion or not;
• a block skip erasure judgment means for judging whether both the block skip command and the block skip end command detected by said block skip command detection means and said block skip end command detection means respectively can be erased or not;
• a block skip erasure means for erasing said block skip command and said block skip end command when said block skip erasure judgment means makes a decision that these commands can be detected;
• and
• a program transformation means for transforming said NC program into an electronic cam program.

A numerical control method for machine tool, comprising the steps of:

• (a) reading an NC program;
• (b) applying a predetermined block skip pre-process to said NC program read by the step (a);
• and
• (c) transforming said NC program subjected to said predetermined block skip pre-process by the step (b) into electronic cam data.