main.lyx

CNC 的开放码,EMC2 V2.2.8版

#LyX 1.3 created this file. For more info see http://www.lyx.org/
\lyxformat 221
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\begin_preamble
\usepackage[plainpages=false,pdfpagelabels,colorlinks=true,linkcolor=blue]{hyperref}
\title{The EMC2 RS274NGC Interpreter}
\end_preamble
\language english
\inputencoding default
\fontscheme bookman
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\papersize Custom
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\paperorientation portrait
\paperwidth 8.5in
\paperheight 11in
\leftmargin 1.2in
\topmargin 1in
\rightmargin 0.6in
\bottommargin 0.6in
\secnumdepth 5
\tocdepth 5
\paragraph_separation skip
\defskip smallskip
\quotes_language english
\quotes_times 2
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\layout Chapter

Language Overview
\begin_inset LatexCommand \label{cha:Language-Overview}

\end_inset 


\layout Standard

The RS274/NGC language is based on lines of code.
 Each line (also called a 
\begin_inset Quotes eld
\end_inset 

block
\begin_inset Quotes erd
\end_inset 

) may include commands to a machining center to do several different things.
 Lines of code may be collected in a file to make a program.
\layout Standard

A typical line of code consists of an optional line number at the beginning
 followed by one or more 
\begin_inset Quotes eld
\end_inset 

words.
\begin_inset Quotes erd
\end_inset 

 A word consists of a letter followed by a number (or something that evaluates
 to a number).
 A word may either give a command or provide an argument to a command.
 For example, 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
G1 X3
\family default 

\begin_inset Quotes erd
\end_inset 

 is a valid line of code with two words.
 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
G1
\family default 

\begin_inset Quotes erd
\end_inset 

 is a command meaning 
\begin_inset Quotes eld
\end_inset 

move in a straight line at the programmed feed rate
\begin_inset Quotes erd
\end_inset 

, and 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
X3
\family default 

\begin_inset Quotes erd
\end_inset 

 provides an argument value (the value of X should be 3 at the end of the
 move).
 Most RS274/NGC commands start with either G or M (for General and Miscellaneous
).
 The words for these commands are called 
\begin_inset Quotes eld
\end_inset 

G codes
\begin_inset Quotes erd
\end_inset 

 and 
\begin_inset Quotes eld
\end_inset 

M codes.
\begin_inset Quotes erd
\end_inset 


\layout Standard

The RS274/NGC
\begin_inset LatexCommand \index{RS274NGC}

\end_inset 

 language has no indicator for the start of a program.
 The Interpreter, however, deals with files.
 A single program may be in a single file, or a program may be spread across
 several files.
 A file may demarcated with percents in the following way.
 The first non-blank line of a file may contain nothing but a percent sign,
 
\begin_inset Quotes eld
\end_inset 

%
\begin_inset Quotes erd
\end_inset 

, possibly surrounded by white space, and later in the file (normally at
 the end of the file) there may be a similar line.
 Demarcating a file with percents is optional if the file has an 
\family typewriter 
M2
\family default 
 or 
\family typewriter 
M30
\family default 
 in it, but is required if not.
 An error will be signalled if a file has a percent line at the beginning
 but not at the end.
 The useful contents of a file demarcated by percents stop after the second
 percent line.
 Anything after that is ignored.
\layout Standard

The RS274/NGC language has two commands (
\family typewriter 
M2
\family default 
 or 
\family typewriter 
M30
\family default 
), either of which ends a program.
 A program may end before the end of a file.
 Lines of a file that occur after the end of a program are not to be executed.
 The interpreter does not even read them.
\layout Section

Format of a line
\layout Standard

A permissible line of input RS274/NGC code consists of the following, in
 order, with the restriction that there is a maximum (currently 256) to
 the number of characters allowed on a line.
\layout Enumerate

an optional block delete character, which is a slash 
\begin_inset Quotes eld
\end_inset 

/
\begin_inset Quotes erd
\end_inset 

 .
 
\layout Enumerate

an optional line number.
\layout Enumerate

any number of words, parameter settings, and comments.
\layout Enumerate

an end of line marker (carriage return or line feed or both).
 
\layout Standard

Any input not explicitly allowed is illegal and will cause the Interpreter
 to signal an error.
\layout Standard

Spaces and tabs are allowed anywhere on a line of code and do not change
 the meaning of the line, except inside comments.
 This makes some strange-looking input legal.
 The line 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
g0x +0.
 12 34y 7
\family default 

\begin_inset Quotes erd
\end_inset 

 is equivalent to 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
g0 x+0.1234 y7
\family default 

\begin_inset Quotes erd
\end_inset 

, for example.
\layout Standard

Blank lines are allowed in the input.
 They are to be ignored.
\layout Standard

Input is case insensitive, except in comments, i.e., any letter outside a
 comment may be in upper or lower case without changing the meaning of a
 line.
 
\layout Section

Line Number
\begin_inset LatexCommand \index{Line Number}

\end_inset 


\layout Standard

A line number is the letter N followed by an integer (with no sign) between
 0 and 99999 written with no more than five digits (000009 is not OK, for
 example).
 Line numbers may be repeated or used out of order, although normal practice
 is to avoid such usage.
 Line numbers may also be skipped, and that is normal practice.
 A line number is not required to be used, but must be in the proper place
 if used.
\layout Section

Word
\begin_inset LatexCommand \index{Word}

\end_inset 


\layout Standard

A word is a letter other than N followed by a real value.
\layout Standard

Words may begin with any of the letters shown in Table 
\begin_inset LatexCommand \ref{cap:Words-and-their}

\end_inset 

.
 The table includes N for completeness, even though, as defined above, line
 numbers are not words.
 Several letters (I, J, K, L, P, R) may have different meanings in different
 contexts.
 Letters which refer to axis names are not valid on a machine which does
 not have the corresponding axis.
\layout Standard


\begin_inset Float table
placement H
wide false
collapsed false

\layout Caption

Words and their meanings
\begin_inset LatexCommand \label{cap:Words-and-their}

\end_inset 


\layout Standard
\align center 

\begin_inset  Tabular
<lyxtabular version="3" rows="26" columns="2">
<features>
<column alignment="center" valignment="top" leftline="true" width="0">
<column alignment="left" valignment="top" leftline="true" rightline="true" width="0">
<row topline="true" bottomline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Letter
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Meaning
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

A
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

A axis of machine
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

B
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

B axis of machine
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

C
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

C axis of machine
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

D
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Tool radius compensation number
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

F
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Feed rate
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

G
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

General function (See table 
\begin_inset LatexCommand \ref{cap:Modal-Groups}

\end_inset 

)
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

H
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Tool length offset index
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

I
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

X offset for arcs and G87 canned cycles
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

J
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Y offset for arcs and G87 canned cycles
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

K
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Z offset for arcs and G87 canned cycles.
\end_inset 
</cell>
</row>
<row>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Spindle-Motion Ratio for G33 synchronized movements.
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

M
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Miscellaneous function (See table 
\begin_inset LatexCommand \ref{cap:Modal-Groups}

\end_inset 

)
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

N
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Line number
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

P
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Dwell time in canned cycles and with G4.
 
\end_inset 
</cell>
</row>
<row>
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text

\layout Standard

Key used with G10.
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

Q
\end_inset 
</cell>
<cell alignment="center" valignment="top" topline="true" leftline="true" rightline="true" usebox="none">
\begin_inset Text