
13. FUNCTIONS TO SIMPLIFY PROGRAMMING
13.1 Canned Cycles (G73, G74, G76, G78, G79, G80 to G89)
The machining data in a canned cycle is specified as shown below:
t
f
Drilling mode Drilling data
Drilling position data
Fig 13.1 (cl) Composition of Drilfing Data
Contents of
specification
Address Explanation
Drilling mode G
G
See Table 13.1
Drilling data
Specifies the distance from point R to the bottom of the hole in Fig. 13.1 (a) with an
incremental value or the position of the hole bottom with an absolute value. The feed rate is
X specified in the F code in operation 2.
In operation 4, it is the rapid traverse rate or the feed rate specified in the F code, according
to the drilling mode.
R
Specifies the distance from the initial level to point R level in Fig. 13.1 (a) with an absolute
value. The feed rate is the rapid traverse rate in operation 1 and 5.
Q
Specifies each cut-in value with G73 and G83. (Always specified with an incremental value.)
P
Specifies the dwell time at the bottom of the hole. The relationship between the time and the
specified value is the same as for GO4.
F Specifies the feed rate.
Since the drilling mode (G ITI) remains unchanged until another drilling mode is
specified or the canned cycle is cancelled with a G code, it need not be specified any
blocks when the same drilling mode continues.
G80 and the 01 group G codes are
used to cancel a canned cycle. Once the drilling data has
been specified in the
canned cycle, it is retained until it is changed or the canned cycle is cancelled.
Therefore, all required drilling data shall be specified when the canned cycle is started
and only data to be changed shall be specified during the cycie.
When the system is reset during the canned cycle, the drilling mode, and drilling data
are deleted.
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