NCT G81 drilling cycle is used for simple drilling/spot drilling operations.

Contents

## Programming

G17 G81 X... Y... Z... R... F.. L... G18 G81 Z... X... Y... R... F... L... G19 G81 Y... Z... X... R... F... L..

### Parameters

Following table X,Y,Z definitions will work for G17 Plane, for other planes these will change as for

G18 plane Z X will be hole position and Y will be drilling axis

G19 plane Y Z will be hole position and X will be drilling axis

Parameter | Description |
---|---|

X | Hole position in x-axis. |

Y | Hole position in y-axis. |

Z | Depth, tool will travel with feed to Z-depth starting from R plane. |

R | Position of the R plane. |

L | Number of cycle repetitions (if required). |

F | Feedrate. |

### Operations

The operations of the G81 cycle are

- Rapid-traverse positioning in the selected plane
- Rapid-traverse movement as far as point R
- Drilling as far as the point Z, with feed F
- Retraction
- If G99, retraction to point R, in rapid traverse
- If G98, rapid-traverse retraction to the initial point

## Programming Examples

### Programming a Series of Bores

The programming of bores 10mm apart from each other with NCT G81 drilling cycle, here

%O7071(7.1) N100 T1 N110 G54 G0 X0 Y50 N120 G43 Z50 H1 N130 S1000 M3 M8 N140 G81 XI10 Y50 R2 Z-10 L9 N150 G80 N160 G0 Z100 N170 M30 %

### Programming Bore Series Example

The second series of bores is programmed as a new drilling cycle, where size is again to be specified in increment. Since both cycles would include the middle bore, the second series must be split into lower and upper part.

%O7072(7.2) N100 T1 N110 G54 G0 X0 Y50 N120 G43 Z50 H1 N130 S1000 M3 M8 N140 G81 XI10 Y50 R2 Z-10 L9 N150 G80 N160 G0 X50 Y0 N170 G81 X50 YI10 R2 Z-10 L4 N180 G80 N190 G0 X50 Y50 N200 G81 X50 YI10 R2 Z-10 L4 N210 G80 N220 G0 Z100 N230 M30 %