1.
Prepare an NC part program for the part shown in Figure HW2. The suggested
cutting conditions are 5 ipm for the feed rate and 300 fpm for the speed. The cutter
diameter is 2.5 in. The dimensions are all in inches. (25 points) Assume the cutter
length is defined by H02 and the cutter radius is defined by H10.
Fig. HW2.1 Part drawing
Solution:
(Students’ coordinate’s definition can be different from this solution)
(RPM TO FPM: http://www.pacificmarine.net/packingfeetperminuteconv.htm)
N5
G40 G54 G20
;
Cancel cutter radius compensation, zero offset, measuring in inches
N10
G43 H02
;
Tool length compensation, the value of length.
N15
M03 S460
;
Turn on spindle clockwise, speed is 460 rpm. (rpm=FPM/ (pi*Dia))
N20
G00 X1.5 Y1.5 Z2.2
; Fast linear motion to the given coordinate.
N25
G01
G41 H10 X2 Y2 Z1 F5
; Linear motion, left cutter radius composition, coordinates, feed rate.
; G41, give NC machine edge coordinates, machine find cutter center
coordinates.
N30
(G01 X2) Y7 (Z1)
; Continue linear motion, G01, X2 Z1 can be omitted.
N35
X10
N40
X12 Y6
N45
Y2
N50
X2
(N55
Z2.2)
(N60
G00 G40 X7 Y4.5 Z2.2)
(N65
M30
)
N55
G00 Z2.2

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