N2 Fitting and Machining Theory|Hands-On! 203 M-codes: On-off functions to the motor


Basic M-Codes Function M00


Program stop until operator restarts


M01 Option stop – if machine is set to detect it M02 M03 M04 M05 M06 M07 M08 M09 M20 M21


End program


Start spindle – clockwise rotation Start spindle – anti-clockwise rotation Stop spindle Change tool


Coolant on number 1 Coolant on number 2 Coolant off


Tailstock back Tailstock forward


M25 Open chuck M26 M30


17.10 Programming


• Absolute programming: Tis makes use of absolute dimensions with all points of reference being taken from a common point.


• Incremental programming: Tis is done by taking the distance from one point to the next on the workpiece, not from a common point.


17.11 The basic principles of programming a computer controlled lathe


Once a final, dimensioned drawing is available to the program writer will write an instructional program in code form of how the machining will progress. Tis contains the following operations:


• Te location of each operation in co-ordinate format. • Te sequence of operations and the selection of tools. • Cutting speeds and feed rates and the length and depth of cuts. • When and where to apply cutting fluid, how much and for how long.


Once the above have been completed, the technician will feed the information into a localised CPU. Another technician will set up the workpiece and cutting tools and determine the central reference point.


Close chuck End program


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