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2 G Code
2 - 60 NJ/NY-series G code Instructions Reference Manual (O031)
G74 Left-handed Tapping Cycle
This instruction performs reverse tapping machining.
This command is convenient for tapping. Internally, it is substituted by the code corresponding to the
following. This command uses an M code. Therefore, in order to execute the Left-handed Tapping
Cycle (G74) or Tapping Cycle (G84) correctly, the M-code reset queue needs to be processed by the
sequence control program correctly.
The X and Y words indicate the initial level, Z word indicates the Z point, R word the R point level, P
word the dwell time, and K word the number of repetitions. If the K word is omitted, it is assumed to be
K=1.
 When the CNC coordinate system has the spindle axis
The spindle axis internally functions as the C-axis. In this case, positions of Z-axis and spindle axis syn-
chronize.
Modal/Non-modal Modal
Modal group 09 Fixed cycle
Instruction format G74 X- Y- Z- R- P- K-
Relevant G codes G80, G98, G99, G90, G91
Parameters
Parameter Name Description
X Target X-axis Position Specifies the destination position [command units] on the
X-axis.
Y Target Y-axis Position Specifies the destination position [command units] on the
Y-axis.
Z Z point Specifies the position of Z point [command units].
R R point Specifies the position of R point [command units].
P Dwell time Specifies a stop time [ms] at the Z point.
K Number of repetitions Specifies a number of repetitions of the fixed cycle.
Function
G74 Xx Yy Zz Rr Pp Kk
//if G91 and G98 are activated
M19
//Execute below code k times
G00 Xx Yy //Initial level
G00 Zr
//R point level
G01 Zz //Z point
G04 Pp //dwell
G01 Z-z //R point level
G00 Z-r //Initial level
//End of repetition
M5
//if G91 and G99 are activated
M19
//Execute below code k times
G00 Xx Yy //Initial level (first time) -> R point level (from the second)
(G00 Zr
//R point level (first time only))
G01 Zz //Z point
G04 Pp //dwell
G01 Z-z //R point level
//End of repetition
M5