GSK980MDc Milling CNC System User Manual
76
I Programming
Function: This kind of cycle performs high-speed peck drilling, it performs intermittent cutting feed to
the bottom of a hole, and eliminating the chips from the hole simultaneously.
Explanation: Refer to the command explanation of canned cycle in Table 3-2.
Cycle process:
(1) Positioning to XY plane level at the rapid traverse;
(2) Down to the point R plane at the rapid traverse rate;
(3) Cutting feed for Q distance;
(4) Retract d distance in rapid traverse;
(5) Cutting feed for (Q+d) distance
(6) Machine to the Z axis hole bottom by cycling the (4) and (5);
(7) Return to the start point level or point R plane according to G98 or G99 at the rapid traverse.
Command Path:
Related Explanation:
(1) This kind of cycle is peck drilling for Q value intermittent feeding along the Z-axis direction. The Q
value should be positive, the sign is ineffective even if the negative value is specified. If the Q value is not
specified, then it defaults 0.1mm. If a depth to be cut is less than the Q value, then cut to the bottom of the
hole without tool retraction at the rapid traverse for the first time.
(2) To remove chips from the hole easily, a small value can be set for retraction. This allows drilling to
be performed efficiently. The tool is retracted in rapid feed, the retraction amount d is set by parameter
No.5114, the default is 1000, unit: 0.001mm.
(3) The command P is disabled, but its value is reserved as canned cycle modal value.
3.24.2.2 Left-handed Tapping Cycle G74
Format: G98/G99 G74 X_ Y_ R_ Z_ P_ F_ L
Function: This cycle performs left-handed tapping. In the left-handed tapping cycle, the spindle
rotates clockwise for tapping till the bottom of the hole has been reached, then retracts by
counter-clockwise after dwell.
Explanation: For canned cycle explanation, see the Table 3-2
Thereinto, the F is indicated for tooth pitch. The value range are indicated as 0.001~500.00mm (metric),
0.06~25400 teeth/inch (inch)
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