G85 Boring cycle

                                                   The G85 Boring cycle is used for boring and reaming operations. This cycle is used to improve the surface finish of the hole to meet the high dimension tolerance or the concentricity of the hole. This operation carries out the tool in and out of the hole without spindle stop. Point to be noted in this operation is a little amount of material will be removed during the tool is feeded backwards out of the hole, this happens because of the released tool pressure during retract.  This cycle is especially suitable for reaming.

Code line for G85 Boring cycle:

N100 G98 (G99) G85 X… Y… R… Z… F…

Diagram for G85 Boring cycle:

Steps for the G85 Boring 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 position.

       3.       Feedrate motion to the depth in Z.

       4.       Feedrate motion back to the R level.

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