SZGH SZGH-CNC1000MDb Series, Руководство пользователя

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-Shenzhen Guanhong Automation Co.,Ltd.- SZGH-CNC1000MDb Series
- 72 -
3.28.2 Left-handed Peck Rigid Tapping Cycle (G74)
This cycle performs left-handed tapping. In the left-handed tapping cycle, when the bottom of
the hole has been reached, the spindle rotates clockwise.
Tapping a deep hole in rigid tapping mode may be difficult due to chips sticking to the tool or
increased cutting resistance. In such cases, the peck rigid tapping cycle is useful.
This cycle may be performed in standard mode or rigid tapping mode.
In standard mode, the spindle is rotated and stopped along with a movement along the tapping
axis using miscellaneous functions M03 (Rotating the spindle clockwise), M04 (rotating the spindle
counterclockwise), and M05 (Stopping the spindle) to perform tapping following with SP-Encoder.
In Rigid tapping mode, tapping is performed by controlling the spindle motor as if it were a
servo motor and by interpolation between the tapping axis and spindle. When tapping is performed
in rigid mode, the spindle rotates one turn every time a certain feed(thread lead) which takes place
along the tapping axis. This operation doe not vary even during acceleration or deceleration.
Format: G74 X_ Y_ Z_ R_ P_ K_ Q_ L_ S_ ;
X_ Y_ : Hole position data
Z_ : The distance from point R to the bottom of the hole
R_ : The distance from initial level to point R level
P_ : Dwell time unit:s
K_ : Pitch
Q_ : Depth of cut for each cutting feed
L_ : Number of repeats (if required)
S_ : Spindle feedrate
G74(G98) G74(G99)
Tapping is performed by turning the spindle counterclockwise. When the bottom of the hole
has been reached, the spindle is rotated clockwise for retraction. This creates a reverse thread.