This document contains information about computer-assisted part programming using APT (Automatically Programmed Tool) language. It discusses the tasks divided between the human programmer and computer, including input translation, arithmetic computations, editing, and post processing. It also describes defining part geometry, specifying tool paths and operations, and includes examples of part programs for drilling and milling operations.
difference of NC and CNC ,Part programming,Methods of manual part programming,Basic CNC input data,Preparatory Functions ,Miscellaneous Functions,Interpolation:Canned cycles:part programming on component,Tool length compensation,Cutter Radius,Task compensation:Types of media of NC
APT stands for Automatically Programmed Tool. It is a language that defines the tool path with respect to the part
geometry, and often forms the basis for post-processor generated NC files.
difference of NC and CNC ,Part programming,Methods of manual part programming,Basic CNC input data,Preparatory Functions ,Miscellaneous Functions,Interpolation:Canned cycles:part programming on component,Tool length compensation,Cutter Radius,Task compensation:Types of media of NC
APT stands for Automatically Programmed Tool. It is a language that defines the tool path with respect to the part
geometry, and often forms the basis for post-processor generated NC files.
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Introduction to CNC machine and Hardware. aman1312
Complete detailing of cnc machine and its operations with its required hardware necessary for increasing its Automation and increasing its manufacturing capability. Also increase in complex shape manufacturing.
Introduction, Conventional and Revised with CAD/CAM Product cycle, Application of computers to the design process, comparison of capabilities of designers and computers, Reasons for implementing CAD, Benefits of CAD, CAD workstation,
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This describes the mechanism of Computer Numerical Control along with its types, control system, motion system, Programming of CNC, G codes, Part programming, adaptive control machining etc.
What is process planning .Difficulties in traditional process planning,CAPP Model,Types of CAPP ,1.Retrieval type CAPP (variant) systems.
2.Generative CAPP systems.
3.Hybrid CAPP systems.
Process planning system , Machinability data systems , Benefits of CAPP
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Computer aided part programming: concept and need of CAP – CNC languages – APT
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2. Computer assisted part programming
(APT, Automatically Programmed Tool)
Manual part programming is time-consuming, tedious, and
subject to human errors for complex jobs.
Machining instructions are written in English-like statements that
are translated by the computer into the low-level machine code
of the MCU.
It is used for more complex jobs.
3. APT (Automatically Programmed Tool)
The various tasks in computer-assisted part
programming are divided between;
The human part programmer
The computer.
Sequence of activities in computer-assisted part programming
4. Computer Tasks in Computer-Assisted Part Programming
Input translation – converts the coded instructions in the part
program into computer usable form
Arithmetic and cutter offset computations – performs
the mathematical computations to define the part
surface and generate the tool path, including cutter
offset compensation (CLFILE)
Editing – provides readable data on cutter locations
and machine tool operating commands (CLDATA)
Post processing – converts CLDATA into low-level code that
can be interpreted by the MCU
5. Part Programmer's Job
Two main tasks of the programmer:
1- Define the part geometry
2- Specify the tool path and Operation Sequence
6. 1- Define the part geometry
Geometry elements are sometimes defined only for use in
specifying tool path
Examples of part geometry definitions:
P4 = POINT/35, 90,0
L1 = LINE/P1, P2
C1 = CIRCLE/CENTER, P8, RADIUS, 30.0
7. 2- Specify the tool path and Operation Sequence
Tool path consists of a sequence of points or
connected line and arc segments, using previously
defined geometry elements
Point-to-Point command:
GOTO/P0
Continuous path command:
GOLFT/L2, TANTO, C1
8. Other Functions in Computer-Assisted Part Programming
Specifying cutting speeds and feed rates
Designating cutter size (for tool offset calculations)
Specifying tolerances in circular interpolation
Naming the program
Identifying the machine tool
9. Cutter Offset
Cutter path must be offset from actual part outline by
A distance equal to the cutter radius
10. There are four basic types of statements in the APT language:
Geometry statements, also called definition statements; are used
to define the geometry elements that comprise the part.
Motion commands; are used to specify the tool path.
Postprocessor statements; control the machine tool operation,
for example, to specify speeds and feeds, set tolerance values
for circular interpolation, and actuate other capabilities of the
machine tool.
Auxiliary statements; a group of miscellaneous statements
used to name the part program, insert comments in the
program and accomplish similar functions.
11. APT vocabulary words consist of six or fewer characters. The
characters are almost always letters of the alphabet.
Geometry statements
The points, lines, and surfaces must be defined in the program
prior to specifying the motion statements.
SYMBOL = GEOMETRY TYPE/descriptive data
12. A symbol can be may combination of six or fewer alphabetical and
numerical characters, at least one of which must be alphabetical.
13. Points :
Specification of a point can be accomplished by the following:
Designating its x-, y-, and z-coordinates;
P1 = POINT/15.0, 10.0, 25.0
As the intersection of two intersecting lines;
P2 = POINT/INTOF, L1, L2
14. Lines:
A line in APT is considered to be of infinite length in both
directions. Specification of a line can be accomplished by the
following:
Two points through which it passes;
L1 = LINE/P3, P4
Passes through point (P5) and parallel to another line (L3) that
has been previously defined;
L2 = LINE/P5, PARLEL, L3
15. Plane : A plane can be defined by the following:
Three points through which it passes;
PL1 = PLANE/P1, P2, P3
P1, P2 and P3 must be non-collinear
Passes through point (P2) and parallel to another plane (PL1)
that has been previously defined;
PL2 = PLANE/P2, PARLEL, PL1
16. center and radius
C1 = CIRCLE/CENTER, P1, RADIUS, 25.0
Three points through which it passes;
C2 = CIRCLE/P4, P5, P6
Circle:
23. 1. Drive surface; this is the surface that guides the
side of the cutter.
2. Part surface; this is the surface, again pictured as a
plane, on which the bottom or nose of the tool is
guided.
3. Check surface; this is the surface that stops the
forward motion of the tool in the execution of the current
command.
