Page 718 - Mechanical Engineers' Handbook (Volume 2)

3 Numerical Controllers 709

tool must remain to the right of the line LIN1 as seen from the tool in the direction of
motion between PT1 and PT2. This move statement is written as follows:
TLRGT, GORGT/LIN1, PAST, LIN2
The next step is to move the tool from PT2 to PT3 along the circle CIRC1:

TLRGT, GOLFT/CIRC1, PAST, LIN3
The next two motion statements to complete the motion around the part are as follows:
GOFWD/LIN3, PAST, LIN4
TLRGT, GOLFT/LIN4, PAST, LIN1
The complete program is shown below:

PARTNO A345, Revision 2
REMARK Part machined in 3/4 inch Aluminum
INTOL/0.00005
OUTTOL/0.00005
CUTTER/12
STPT POINT/0,0,0
PT1 POINT/0,106,0
LIN1 LINE/(POINT/0,106,0), (POINT/400, 106, 0)
CIRC1 CIRCLE/CENTER, (POINT/300, 106, 0), RADIUS, 100
LIN2 LINE/(POINT/400, 206, 0), LEFT, TANTO, CIRC1
LIN3 LINE/(POINT/400, 206, 0), (POINT/100, 206, 0)
LIN4 LINE/(POINT/100, 206, 0), (POINT/100, 106, 0)
SPINDL/ON, CLW
FEDRAT/300
COOLNT/ON
FROM/STPT
INDIRP/PT1
GO/TO, LIN1
TLRGT, GORGT/LIN1, PAST, LIN2
TLRGT, GOLFT/CIRC1, PAST, LIN3
GOFWD/LIN3, PAST, LIN4
TLRGT, GOLFT/LIN4, PAST, LIN1
STOP
FINI

3.5 Numerical Controllers and CAD/CAM
A computer-aided design (CAD) system is used for the creation, modification, and analysis
of designs. A CAD system typically comprises a graphics display terminal, a computer, and
several software packages. The software packages aid the designer in the creation, editing,
and analysis of the design. For instance, in the analysis of a part design, the designer can
access a library of routines for finite-element analysis, heat transfer study, and dynamic
simulation of mechanisms.
Computer-aided manufacturing (CAM) refers to the use of a computer to plan, manage,
and control the operations in a factory. CAM typically has two functions: (1) monitoring
and control of the data on the factory floor and (2) process planning of operations on the
factory floor.