Numerical controller for a grinding machine

A numerical controller, including a central processor for controlling a grinding machine having a wheel head for rotatably supporting a grinding wheel, a work table for rotatably carrying a cylindrical workpiece having a number of axially spaced surfaces to be ground, and first and second servomechanisms connected to said wheel head and said work table for relatively moving the same along first and second axes, said numerical controller comprising:

• memory means connected to said central processor for storing and retrieving data including:
• a number of parameter kind storage means corresponding respectively to a number of grinding modes in any of which any of said workpiece surfaces are ground, each of said parameter kind storage means storing the kinds of control parameters necessary for grinding any of said workpiece surfaces in a corresponding one of said grinding modes;
• a number of data stack tables associated respectively with said number of said workpiece surfaces, each capable of storing one of said grinding modes in which said associated one of said workpiece surfaces is to be ground and a plurality of said control parameters necessary for grinding said associated one of said workpiece surfaces;
• operational sequence storage means for storing a number of operational sequence programs corresponding respectively to said grinding modes, each of said operational sequence programs prescribing the manner in which a series of relative movement between said wheel head and said work table are to be performed in a corresponding one of said grinding modes;
• data write-in means connected to said central processor and operable for writing data into memory, including writing said control parameters into said data stack tables;
• read-out means connected to said central process for receiving and displaying data retrieved from storage, including reading out said kinds of said control parameters from one of said parameter kind storage means corresponding to said grinding mode stored in a designated one of said data stack tables and visibly displaying said kinds of said control parameters read out so as to thereby request the writing-in of these parameters;
• said central processor being connected to selectively designate said number of said data stack tables, and also connected to said data stack tables for selecting one of said operational sequence programs which corresponds to said one of said grinding modes stored in said designated one of said data stack tables;
• and
• feed control means connected to said central processor and to said first and second servomechanisms for controlling the servomechanisms in accordance with said selected one of said operational sequence programs and said control parameters stored in said one of said data stack tables.

A numerical controller including a central processor for controlling a grinding machine having a wheel head for rotatably supporting a grinding wheel, a work table for rotatably carrying a cylindrical workpiece having a number of axially spaced surfaces to be ground, a first servomechanism connected to said wheel head for moving the same toward and away from said work table and a second servomechanism connected to said work table for moving the same in an axial direction of said workpiece to thereby position said workpiece to said grinding wheel, said numerical controller comprising:

• memory means connected to said central processor for storing and retrieving data including,
• data stack table means for storing a number of reference index position data to which said work table is in turn indexed respectively prior to the grindings of said workpiece surfaces;
• said central processor receiving data from said memory means so as to detect the present position of said work table, said present position being expressed as an absolute value, to calculate the difference between said present position data and one of said reference index position data which is programmed and stored in said data stack table means in relation to said one of said workpiece surfaces, and to compensate all of said reference index position data, stored in said data stack table means, for said difference calculated;
• data write-in means connected to said central processor for enabling the same to operate and for writing data into memory, including writing said number of said reference index position data expressed as an absolute value into said data stack table means;
• manual pulse generator means connected to said second servomechanism and manually operable for indexing said work table to a desired position suitable for grinding one of said workpiece surfaces;
• and
• feed control means connected to said central processor and to said second servomechanism for controlling the servomechanism in accordance with said compensated reference index position data so as to thereby successively index said worktable respectively prior to the grindings of said workpiece surfaces.