The G84 tapping cycle is commonly used in CNC (Computer Numerical Control) machining to perform right-hand threading operations with a tap. This cycle automates the process of tapping, making it efficient and precise.
Usage Format
The basic format for a G84 command is as follows:
G84 X... Y... Z... R... P... F...
Where:
X
andY
are the coordinates for the hole’s location.Z
is the depth to which the tap will go.R
is the plane to which the tap will retract.P
is the dwell time at the bottom of the hole.F
is the feed rate or the speed at which the tap will move.
Explanation
When the G84 cycle is initiated, the machine will first move the tap to the specified X
and Y
coordinates. Then, it will plunge the tap to the Z
depth at the F
feed rate. After reaching the desired depth, the tap dwells for the P
duration to ensure proper threading. Finally, the tap retracts to the R
plane, ready for the next operation.
Example
Here’s a simple example of a G84 tapping cycle in action:
N10 G00 X30 Y50 (Move to the starting position)
N20 G43 Z5 H01 (Tool length compensation)
N30 M06 T02 (Tool change to tap)
N40 G98 G84 Z-10 R2 P100 F0.5 (Tapping cycle)
In this program:
- The tap moves to the coordinates X30, Y50.
- Tool length compensation is set with G43, and the tool is changed to T02.
- The G84 cycle is initiated, tapping to a depth of Z-10 at a feed rate of 0.5, with a dwell time of 100 milliseconds, and retracting to a plane of R2.