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G76 represents the precision boring cycle.

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The specific use format is as follows. G76 X__Y__Z__R__Q___F__

XYZ represents the corresponding axis coordinate value. The starting point of R tool. Q represents the lead-out distance. F represents the feed speed.

The actions performed are as follows. The tool is quickly lowered to the R point. Cut the Z-coordinate position of the feed hole. Then the spindle will stop. Return the knife Q. Then quickly move to the R point. Spindle positive (in G99 state)

G87 represents the reverse boring cycle.

G87 X_Y_Z_R_Q_F_

XYZ represents the corresponding axis coordinate value. The starting point of R tool. Q represents the tool exit distance (tool offset). F represents the feed speed.

After the cutter is quickly positioned in XY coordinates. The spindle must stop. Tool offset Q distance. Then quickly cut to point R at the bottom of the hole. In the reverse offset Q distance, the spindle forward, cutting to the Z point. Then the spindle will stop. Return to Q distance. Quickly return to the starting point. And then the spindle turns forward. The cycle is over.

G74 left spiral cutting cycle

It is described as follows

The format is as follows

G74 X_Y_Z_R_F_

The G84 tapping cycle (G84) is the opposite of the G74.

G84 X_Y_Z_R_F_

In the G99 state. The tap is quickly positioned to the R point, and the spindle is passed forward to z. Then the spindle is reversed to point R. Then the cycle ends.

The article comes from CNC numerical control technology blog http://www.quan6688.com/post/133.html

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