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Chapter 3 G Commands
157
Ⅰ
Programming
6
60.64
68
62
Fig.3-96
Program:
O0013;
（
system least input increment is 0.0001mm
）
G50 X100 Z50 M3 S300; (Set workpiece coordinate system, start spindle
and specify spindle speed)
G00 X80 Z10; (Rapid traverse to starting point of machining)
G76 P020560 Q1500 R0.1; (Finishing 2 times, chamfering width 0.5mm, tool
angle 60°, min. cutting depth 0.15, finishing
allowance 0.1)
G76 X60.64 Z-62 P36800 Q18000 F6; (Tooth height 3.68, the first cutting depth 1.8)
G00 X100 Z50 ; (Return to starting point of program)
M30; (End of program)
3.23.11 Enhancement Thread Cutting Cycle G78
Command format:
G78 P(m)(r)(a) Q( dmin)
△
R(d) J_ K_ D_ L_ E_
；
G78 X(U) Z(W) R(i) P(k) Q( d)
△
F(I)
；
Command function:
Machining thread with specified depth of thread (total cutting depth)is
completed by multiple roughing and finishing, if the defined angle of thread is not 0°,
thread run-in path of roughing is from its top to bottom, and angle of neighboring
thread teeth is the defined angle of thread. G78 owns that the thread procession and
tail-retraction function can be selected the single-side blade thread cutting or
dual-side blade alternative cutting, which is contributed to thread cutting with single
tool edge to reduce the wear of tool and to improve the precision of machining thread.
G78 can be used for machining the straight and taper thread, But G78 cannot be
used for machining the face thread.
Command specifications:
X:
X absolute coordinate of thread end point;
U:
Different value of X absolute coordinate between thread end point and start point;
Z:
Z absolute coordinate of thread end point;
W:
Different value of Z absolute coordinate between thread end point and start point;
P
(m): Cutting depth selection 0: Equidistance in-feed; 1: Diminishing in-feed (The
decreasing in-feed is identical with the G76 in-feed method).
The cutting value of each time of the equidistant in-feed is Q( d), the cutting value of
△
Cutting point
zooming in
