main.lyx

CNC 的开放码,EMC2 V2.2.8版

\layout Standard

Feed increment in G73, G83 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

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

\layout Standard

Arc radius or canned cycle plane
\end_inset 
</cell>
</row>
<row topline="true">
<cell alignment="center" valignment="top" topline="true" leftline="true" usebox="none">
\begin_inset Text

\layout Standard

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

\layout Standard

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

\layout Standard

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

\layout Standard

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

\layout Standard

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

\layout Standard

U 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

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

\layout Standard

V 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

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

\layout Standard

W 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

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

\layout Standard

X 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

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

\layout Standard

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

\layout Standard

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

\layout Standard

Z axis of machine
\end_inset 
</cell>
</row>
</lyxtabular>

\end_inset 


\end_inset 


\layout Subsection

Number
\begin_inset LatexCommand \label{sub:Number}

\end_inset 


\layout Standard

The following rules are used for (explicit) numbers.
 In these rules a digit is a single character between 0 and 9.
\layout Itemize

A number consists of (1) an optional plus or minus sign, followed by (2)
 zero to many digits, followed, possibly, by (3) one decimal point, followed
 by (4) zero to many digits - provided that there is at least one digit
 somewhere in the number.
\layout Itemize

There are two kinds of numbers: integers and decimals.
 An integer does not have a decimal point in it; a decimal does.
\layout Itemize

Numbers may have any number of digits, subject to the limitation on line
 length.
 Only about seventeen significant figures will be retained, however (enough
 for all known applications).
\layout Itemize

A non-zero number with no sign as the first character is assumed to be positive.
\layout Standard

Notice that initial (before the decimal point and the first non-zero digit)
 and trailing (after the decimal point and the last non-zero digit) zeros
 are allowed but not required.
 A number written with initial or trailing zeros will have the same value
 when it is read as if the extra zeros were not there.
\layout Standard

Numbers used for specific purposes in RS274/NGC are often restricted to
 some finite set of values or some to some range of values.
 In many uses, decimal numbers must be close to integers; this includes
 the values of indexes (for parameters and carousel slot numbers, for example),
 M codes, and G codes multiplied by ten.
 A decimal number which is supposed be close to an integer is considered
 close enough if it is within 0.0001 of an integer.
 
\layout Subsection

Numbered Parameters
\begin_inset LatexCommand \label{sub:Numbered-Parameters}

\end_inset 


\layout Standard

A numbered parameter is the pound character 
\family typewriter 
#
\family default 
 followed by an integer between 1 and 5399.
 The parameter is referred to by this integer, and its value is whatever
 number is stored in the parameter.
 
\layout Standard

A value is stored in a parameter with the = operator; for example "
\family typewriter 
#3 = 15
\family default 
" means "set parameter 3 to 15." A parameter setting does not take effect
 until after all parameter values on the same line have been found.
 For example, if parameter 3 has been previously set to 15 and the line
 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
#3=6 G1 x#3
\family default 

\begin_inset Quotes erd
\end_inset 

 is interpreted, a straight move to a point where x equals 15 will occur
 and the value of parameter 3 will be 6.
 
\layout Standard

The 
\family typewriter 
#
\family default 
 character takes precedence over other operations, so that, for example,
 
\begin_inset Quotes eld
\end_inset 


\family typewriter 
#1+2
\family default 

\begin_inset Quotes erd
\end_inset 

 means the number found by adding 2 to the value of parameter 1, not the
 value found in parameter 3.
 Of course, 
\family typewriter 
#[1+2]
\family default 
 does mean the value found in parameter 3.
 The 
\family typewriter 
#
\family default 
 character may be repeated; for example 
\family typewriter 
##2
\family default 
 means the value of the parameter whose index is the (integer) value of
 parameter 2.
 
\layout Subsection

Named Parameters
\begin_inset LatexCommand \label{sub:Named-Parameters}

\end_inset 


\layout Standard

Named parameters work like numbered parameters but are easier to read.
 All parameter names are converted to lower case and have spaces and tabs
 removed.
 Named parameters must be enclosed with 
\family typewriter 
< >
\family default 
 marks.
\layout Standard


\family typewriter 
#<named parameter here>
\family default 
 is a local named parameter.
 By default, a named parameter is local to the scope in which it is assigned.
 You can't access a local parameter outside of its subroutine - this is
 so that two subroutines can use the same parameter names without fear of
 one subroutine overwriting the values in another.
\layout Standard


\family typewriter 
#<_global named parameter here>
\family default 
 is a global named parameter.
 They are accessible from within called subroutines and may set values within
 subroutines that are accessible to the caller.
 As far as scope is concerned, they act just like regular numeric parameters.
 They are not stored in files.
 
\layout Standard

Examples: 
\layout Itemize

Declaration of named global variable
\layout Standard


\family typewriter 
#<_endmill_dia> = 0.049
\family default 
 
\layout Itemize

Reference to previously declared global varaiable
\layout Standard


\family typewriter 
#<_endmill_rad> = [#<_endmill_dia>/2.0]
\family default 
 
\layout Itemize

Mixed literal and named params
\layout Standard


\family typewriter 
o100 call [0.0] [0.0] [#<_inside_cutout>-#<_endmill_dia>] [#<_Zcut>] [#<_feedrate>
]
\layout Standard

Notes: 
\layout Standard

The global parameters _a, _b, _c, ...
 _z have been reserved for special use.
 In the future, they may provide access to the last Aword, Bword, Cword,
 etc.
 
\layout Subsection

Expressions
\begin_inset LatexCommand \label{sub:Expressions}

\end_inset 


\layout Standard

An expression is a set of characters starting with a left bracket 
\family typewriter 
[
\family default 
 and ending with a balancing right bracket 
\family typewriter 
]
\family default 
.
 In between the brackets are numbers, parameter values, mathematical operations,
 and other expressions.
 An expression is evaluated to produce a number.
 The expressions on a line are evaluated when the line is read, before anything
 on the line is executed.
 An example of an expression is 
\family typewriter 
[1 + acos[0] - [#3 ** [4.0/2]]]
\family default 
.
\layout Subsection

Binary Operators
\begin_inset LatexCommand \label{sub:Binary-Operators}

\end_inset 


\layout Standard

Binary operators only appear inside expressions.
 There are four basic mathematical operations: addition (
\family typewriter 
+
\family default 
), subtraction (
\family typewriter 
-
\family default 
), multiplication (
\family typewriter 
*
\family default 
), and division (
\family typewriter 
/
\family default 
).
 There are three logical operations: non-exclusive or (
\family typewriter 
OR
\family default 
), exclusive or (
\family typewriter 
XOR
\family default 
), and logical and (
\family typewriter 
AND
\family default 
).
 The eighth operation is the modulus operation (
\family typewriter 
MOD
\family default 
).
 The ninth operation is the 
\begin_inset Quotes eld
\end_inset 

power
\begin_inset Quotes erd
\end_inset 

 operation (
\family typewriter 
**
\family default 
) of raising the number on the left of the operation to the power on the
 right.
 The relational operators are equality (
\family typewriter 
EQ
\family default 
), inequality (
\family typewriter 
NE
\family default 
), strictly greater than (
\family typewriter 
GT
\family default 
), greater than or equal to (
\family typewriter 
GE
\family default 
), strictly less than (
\family typewriter 
LT
\family default 
), and less than or equal to (
\family typewriter 
LE
\family default 
).
\layout Standard

The binary operations are divided into several groups according to their
 precedence.
 (see table 
\begin_inset LatexCommand \ref{cap:Operator-Precedence}

\end_inset 

) If operations in different precedence groups are strung together (for
 example in the expression 
\family typewriter 
[2.0 / 3 * 1.5 - 5.5 / 11.0]
\family default 
), operations in a higher group are to be performed before operations in
 a lower group.
 If an expression contains more than one operation from the same group (such
 as the first 
\family typewriter 
/
\family default 
 and 
\family typewriter 
*
\family default 
 in the example), the operation on the left is performed first.
 Thus, the example is equivalent to: 
\family typewriter 
[[[2.0 / 3] * 1.5] - [5.5 / 11.0]]
\family default 
 , which is equivalent to to 
\family typewriter 
[1.0 - 0.5]
\family default 
 , which is 
\family typewriter 
0.5
\family default 
.
\layout Standard

The logical operations and modulus are to be performed on any real numbers,
 not just on integers.
 The number zero is equivalent to logical false, and any non-zero number
 is equivalent to logical true.
 
\layout Standard


\begin_inset Float table
placement H
wide false
collapsed false

\layout Caption

Operator Precedence
\begin_inset LatexCommand \label{cap:Operator-Precedence}

\end_inset 


\begin_inset LatexCommand \index{operator precedence}

\end_inset 


\layout Standard
\align center 

\begin_inset  Tabular
<lyxtabular version="3" rows="6" columns="2">
<features>
<column alignment="center" valignment="top" leftline="true" width="0">
<column alignment="center" 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

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

\layout Standard

Precedence
\end_inset 
</cell>
</row>
<row topline="true">
<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


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

\layout Standard

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

\layout Standard

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

\layout Standard

+ -
\end_inset