Format of Canned Cycle

Data for hole machining is set in a data block containing a canned cycle calling command G73 into G76, G81 and G89.

When positioning plane is XY-plane and cycle coordinate axis is Z-axis, the format of canned cycle is as follows:

  • G command to call canned cycle

    Once it is executed, canned cycle G command will be continuously effective until it is canceled by a canned cycle (G80, G00~G03) or substituted by another canned cycle G command.

  • Data for hole position

    It specifies where to start executing canned cycle (it can be both absolute and incremental coordinates).

  • Data for hole machining

    The format of symbol address R and Z in data for hole machining is as follows:

  • Z_: in absolute programming, it means the position of point Z in the hole bottom plane; in incremental programming, it means the distance from point R to point Z in the hole bottom plane.

  • R_: in absolute programming, it means the position of point R; in incremental programming, it means the distance from the initial point to point R.

  • Q_: G73G83 model specifies the cutting depth each time (incremental value is positive); G76G87 model specifies tool displacement (incremental value is positive and negative sign will be neglected.)

  • P_: the dwell time at bottom of hole; its unit is ms with no decimal point.

  • F_: feed speed. This command is modal.

  • K_: number of repeats, with default as K1. It is a non-modal command. In G91 mode, with setting this parameter, one block can implement the machining of several isometric holes distributed in one straight line. In G90 mode, this parameter can specify the repeated machining times on the same position.

CAUTION:

G Command of canned cycle, and commands Z, R, Q, and P, are all modal. They will remain effective until hole machining mode is canceled. Therefore, only if these commands are specified at the beginning of the program, it is unnecessary to specify them again in the following consecutive machining; if the data, such as hole depth, of a certain hole is changed, you only need to modify this data.