glossary.lyx

CNC 的开放码,EMC2 V2.2.8版

Home
\begin_inset LatexCommand \index{home}

\end_inset 


\begin_inset LatexCommand \label{Home}

\end_inset 

 A specific location in the machine's work envelope that is used to make
 sure the computer and the actual machine both agree on the tool position.
\layout Description

ini\SpecialChar ~
file
\begin_inset LatexCommand \index{INI}

\end_inset 


\begin_inset LatexCommand \label{inifile}

\end_inset 

 A text file that contains most of the information that configures EMC for
 a particular machine
\layout Description

Joint\SpecialChar ~
Coordinates
\begin_inset LatexCommand \index{joint coordinates}

\end_inset 


\begin_inset LatexCommand \label{Joint_Coordinates}

\end_inset 

 These specify the angles between the individual joints of the machine.\SpecialChar ~
See
 also Kinematics
\layout Description

Jog
\begin_inset LatexCommand \index{jog}

\end_inset 

 Manually moving an axis of a machine.
 Jogging either moves the axis a fixed amount for each key-press, or moves
 the axis at a constant speed as long as you hold down the key.
\layout Description

kernel-space
\begin_inset LatexCommand \label{kernel-space}

\end_inset 

 See real-time.
\layout Description

Kinematics
\begin_inset LatexCommand \index{kinematics}

\end_inset 


\begin_inset LatexCommand \label{Kinematics}

\end_inset 

 The position relationship between world coordinates and joint coordinates
 of a machine.
 There are two types of kinematics.
 Forward kinematics is used to calculate world coordinates from joint coordinate
s.
 Inverse kinematics is used for exactly opposite purpose.Note that kinematics
 does not take into account, the forces, moments etc.
 on the machine.
 It is for positioning only.
\layout Description

Lead-screw
\begin_inset LatexCommand \index{lead screw}

\end_inset 


\begin_inset LatexCommand \label{Leadscrew}

\end_inset 

 An screw that is rotated by a motor to move a table or other part of a
 machine.
 Lead-screws are usually either ball-screws or acme screws, although conventiona
l triangular threaded screws may be used where accuracy and long life are
 not as important as low cost.
\layout Description

Machine\SpecialChar ~
units
\begin_inset LatexCommand \index{machine units}

\end_inset 

 The linear and angular units used for machine configuration.
 These units are used in the ini file.
 HAL pins and parameters are also generally in machine units.
\layout Description

MDI
\begin_inset LatexCommand \index{MDI}

\end_inset 


\begin_inset LatexCommand \label{MDI}

\end_inset 

 Manual Data Input.
 This is a mode of operation where the controller executes single lines
 of G-code as they are typed by the operator.
\layout Description

NIST
\begin_inset LatexCommand \index{NIST}

\end_inset 


\begin_inset LatexCommand \label{NIST}

\end_inset 

 National Institute of Standards and Technology.
 An agency of the Department of Commerce in the United States.
\layout Description

Offsets
\begin_inset LatexCommand \index{offsets}

\end_inset 


\begin_inset LatexCommand \label{Offsets}

\end_inset 


\layout Description

Part\SpecialChar ~
Program
\begin_inset LatexCommand \index{part Program}

\end_inset 


\begin_inset LatexCommand \label{PartProgram}

\end_inset 

 A description of a part, in a language that the controller can understand.
 For EMC, that language is RS-274/NGC, commonly known as G-code.
\layout Description

Program\SpecialChar ~
Units
\begin_inset LatexCommand \index{program units}

\end_inset 

 The linear and angular units used for part programs.
\layout Description

Rapid
\begin_inset LatexCommand \index{rapid}

\end_inset 


\begin_inset LatexCommand \label{Rapid}

\end_inset 

 Fast, possibly less precise motion of the tool, commonly used to move between
 cuts.
 If the tool meets the material during a rapid, it is probably a bad thing!
\layout Description

Real-time
\begin_inset LatexCommand \index{real-time}

\end_inset 

 
\begin_inset LatexCommand \label{real-time}

\end_inset 

 Software that is intended to meet very strict timing deadlines.
 Under Linux, in order to meet these requirements it is necessary to install
 RTAI or RTLINUX and build the software to run in those special environments.
 For this reason real-time software runs in kernel-space.
\layout Description

RTAI
\begin_inset LatexCommand \index{RTAI}

\end_inset 


\begin_inset LatexCommand \label{RTAI}

\end_inset 

 Real Time Application Interface, see 
\begin_inset LatexCommand \url{https://www.rtai.org/}

\end_inset 

, one of two real-time extensions for Linux that EMC can use to achieve
 real-time performance.
\layout Description

RTLINUX
\begin_inset LatexCommand \index{RTLINUX}

\end_inset 


\begin_inset LatexCommand \label{RTLINUX}

\end_inset 

 See 
\begin_inset LatexCommand \url{http://www.rtlinux.org}

\end_inset 

, one of two real-time extensions for Linux that EMC can use to achieve
 real-time performance.
\layout Description

RTAPI 
\begin_inset LatexCommand \index{RTAPI}

\end_inset 

A portable interface to real-time operating systems including RTAI and RTLINUX
\layout Description

RS-274/NGC
\begin_inset LatexCommand \index{RS274NGC}

\end_inset 


\begin_inset LatexCommand \label{RS274NGC}

\end_inset 

 The formal name for the language used by EMC part programs.
 
\layout Description

Servo\SpecialChar ~
Motor
\begin_inset LatexCommand \index{servo motor}

\end_inset 


\begin_inset LatexCommand \label{ServoMotor}

\end_inset 

 
\layout Description

Servo\SpecialChar ~
Loop
\begin_inset LatexCommand \index{loop}

\end_inset 


\begin_inset LatexCommand \label{ServoLoop}

\end_inset 


\layout Description

Spindle
\begin_inset LatexCommand \index{spindle}

\end_inset 


\begin_inset LatexCommand \label{Spindle}

\end_inset 

 On a mill or drill, the spindle holds the cutting tool.
 On a lathe, the spindle holds the workpiece.
\layout Description

Stepper\SpecialChar ~
Motor
\begin_inset LatexCommand \index{stepper motor}

\end_inset 


\begin_inset LatexCommand \label{StepperMotor}

\end_inset 

 A type of motor that turns in fixed steps.
 By counting steps, it is possible to determine how far the motor has turned.
 If the load exceeds the torque capability of the motor, it will skip one
 or more steps, causing position errors.
\layout Description

TASK
\begin_inset LatexCommand \index{TASK}

\end_inset 


\begin_inset LatexCommand \label{TASK}

\end_inset 

 The module within EMC that coordinates the overall execution and interprets
 the part program.
\layout Description

Tcl/Tk
\begin_inset LatexCommand \index{Tk}

\end_inset 


\begin_inset LatexCommand \label{Tcl/Tk}

\end_inset 

 A scripting language and graphical widget toolkit with which EMC's most
 popular GUI's were written.
\layout Description

Units
\begin_inset LatexCommand \index{units}

\end_inset 

 See 
\begin_inset Quotes eld
\end_inset 

Machine Units
\begin_inset Quotes erd
\end_inset 

, 
\begin_inset Quotes eld
\end_inset 

Display Units
\begin_inset Quotes erd
\end_inset 

, or 
\begin_inset Quotes eld
\end_inset 

Program Units
\begin_inset Quotes erd
\end_inset 

, above.
\layout Description

World\SpecialChar ~
Coordinates
\begin_inset LatexCommand \index{world coordinates}

\end_inset 


\begin_inset LatexCommand \label{World_Coordinates}

\end_inset 

 This is the absolute frame of reference.
 It gives coordinates in terms of a fixed reference frame that is attached
 to some point (generally the base) of the machine tool.
\the_end