G76 Precision Boring cycle

                                            The G76 is a very use full cycle for high quality holes. Same as G87 there are two programming formats available for the precision boring canned cycle G76.

Code line for G76 Precision Boring cycle:

                There are two program formats available for the G76 back boring canned cycle.

First one using the Q, which is commonly used:

N100 G98 (G99) G76 X… Y… R… Z… P… Q… F…

Second one using I and J:

N100 G98 (G99) G76 X… Y… R… Z… P… Q… F…

Diagram for G76 Precision Boring cycle:

Steps for the G76 Precision cycle:

1.       Rapid motion to XY position of the hole position.

      2.       Rapid motion to the R level. I.e., to the top of the hole.

      3.       Feed motion in the Z till the end of the hole.

      4.       Dwell at depth – in Milliseconds (P)

      5.       Spindle Rotation Stop.

      6.       Spindle Orientation.

      7.       Shift OUT (OSS) by the Q value or shift by the amount and direction of I and J. 

      8.       Rapid motion to the R level, i.e., to the top of the hole position.

      9.       Spindle rotation ON (M03).

     10.   Rapid retract to the initial level (with G98) or Rapid retract to R level (with G99).