Relevant regulations for the programming of CNC machine tools (3)


Table 3: Provisions for the auxiliary function M by the ISO standard

Code

Features

Description

Code

Features

Description

M00

Program stop

Spindle, coolant stop

M32-M35

Not specify

M01

Planned stop

Need to press the button to confirm the line change

M36

Feed speed range 1

Non-stop gear shift range

M02

End of program

Spindle, coolant stop, machine reset

M37

Feed speed range 2

M03

Spindle rotates clockwise

Right-hand thread enters the workpiece direction

M38

Spindle speed range 1

Non-stop gear variable speed range

M04

Spindle counterclockwise

Right-handed thread leaves the workpiece

M39

Spindle speed range 2

M05

Spindle stop

Coolant off

M40-M45

Not specify

Can be used for gear shifting

M06

Tool change

Manual or automatic tool change, excluding knife selection

M46-M47

Not specify

M07

No. 2 coolant on

M48

Cancel M49

M08

No. 1 coolant on

M49

Manual speed correction failure

Return to the programmed speed or feed rate

M09

Coolant stop

M50

No. 3 coolant is on

M10

Clamping

Workbench, workpiece, fixture, spindle, etc.

M51

Coolant No. 4

M11

release

M52-M54

Not specify

M12

Not specify

M55

The tool is linearly displaced to the predetermined position 1

M13

The spindle rotates clockwise and the coolant opens

M56

The tool is linearly displaced to the predetermined position 2

M14

The spindle rotates counterclockwise and the coolant opens

M57-M59

Not specify

M15

Fast forward movement

M60

Change workpiece

M16

Fast reverse movement

M61

The workpiece line is unique to the predetermined position 1

M17-M18

Not specify

M62

The tool is linearly displaced to the predetermined position 2

M19

Spindle stop

The spindle is slowly rotated to a predetermined angle to stop

M63-70

Not specify

M20-M29

Not specify

M71

The workpiece is rotated to a predetermined angle 1

M30

End of tape

Complete spindle coolant stop, machine reset, tape rewind, etc.

M72

The workpiece is rotated to a predetermined angle 2

M31

Interlocking mechanism temporarily expires

M73-M99

Not specify

2) Block format

Different CNC machine tools specify different program segment formats according to different functions, the complexity of the numerical control device, and whether the programming is simple and intuitive. If the format of the input program does not meet the requirements, the numerical control device will give an error. Common block formats are fixed-sequence, fixed-sequence with separator TAB, and word address format.

In the early days, due to the simplicity of the numerical control device, a program segment format called a fixed sequence was specified, for example:

Programs written in this format have no address code for each word. The order of the words is the order of the addresses. The order of the words and the number of lines of characters are fixed (regardless of the need of a word), even with the previous paragraph. Compared with some words, it has to be rewritten and cannot be omitted. When the number of significant digits of a word is small, the specified number of digits is padded with "0" in front. Therefore, the length of the perforated tape occupied by each block is constant. The control system of this format is simple, but the programming is not intuitive, the perforation belt is long, and the application is less.

A fixed sequential segment format with the delimited symbol TAB was later produced. The basic form is the same as the above format, except that the words are separated by a separator to indicate the order of the addresses. The above example can be written as:

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