The G76 Fine Boring cycle is a precise and efficient method used in CNC (Computer Numerical Control) machining to achieve high-quality surface finishes and accurate hole dimensions. This cycle is particularly useful for final machining operations where tight tolerances and smooth surfaces are required.

Usage Format

The typical format for a G76 Fine Boring cycle in G-code is as follows:

G76 P... Q... R... X... Z... I... K... D... F...

Each letter represents a parameter that the operator must specify, such as the position, depth, and feed rate.

Explanation

• P: Defines the dwell time at the bottom of the hole.
• Q: Sets the depth of each cut.
• R: Determines the retract position for the tool.
• X: Specifies the diameter of the bore.
• Z: Indicates the depth of the bore.
• I: Controls the taper amount for each pass.
• K: Sets the number of spring passes.
• D: Defines the direction of spindle rotation.
• F: Sets the feed rate for the cutting process.

Example

Here’s a simple example of a G76 Fine Boring cycle in action:

G76 P100 Q200 R0.5 X50 Z-25 I0 K2 D1 F0.1

This command would set up a fine boring cycle with a dwell time of 100 milliseconds, a cut depth of 200 microns per pass, a retract position 0.5mm above the starting point, a final bore diameter of 50mm, a bore depth of -25mm, no taper, two spring passes, clockwise spindle rotation, and a feed rate of 0.1mm/rev.