Numerical control method and numerical control device

A numerical control method comprising the steps of:

• obtaining a moving position of a tool by progressively analyzing a machining program by increments of at least one program block;
• computing a migration rate and a feed speed according to the moving position of the tool;
• resetting a sampling cycle, based on the migration rate and the feed speed, so that a fraction of an instruction pulse will not be generated in the at least one program block;
• periodically generation instruction pulses, having widths of an integer multiple of the reset sampling cycle, according to the reset sampling cycle;
• and
• controlling an output timing of the instruction pulses to a controlled object according to the reset sampling cycle.

A numerical control device comprising:

• an analyzing means for obtaining a moving position of a tool by progressively analyzing a machining program by increments of at least one program block;
• an interpolating means for computing a migration rate and a feed speed of the tool according to the moving position of the tool;
• a sampling cycle computing means for resetting a sampling cycle, based on the migration rate and the feed speed of the tool, so that a fraction of an instruction pulse will not be generated in the at least one program block;
• an instruction pulse generating means for periodically generating instruction pulses, having widths of an integer multiple of the reset sampling cycle, according to the reset sampling cycle;
• and
• a sampling control means for controlling a timing of an output, to a controlled object, of the instruction pulses generated by the instruction pulse generating means.