ADTECH9 Series CNC Programming Manual
Six Steps of Hole Processing Fixed Cycle
The instructions that have influence on the execution of hole processing fixed cycle instruction include
G90/G91 and G98/G99. Fig. 10.2 shows the effect of G90/G91 on hole processing fixed cycle instruction.
Effect of G90/G91 on Hole Processing
G98/G99 determines fixed cycle returns to point R or the start point after hole processing; in G98 mode, Z axis
returns to the start point after hole processing; in G99 mode, it returns to point R.
Generally, if the holes being processed are on a flat plane, we can use G99 instruction, because it will position
next hole after returning to point R in G99 mode; in general programming, point R is close to workpiece
surface, it will shorten part processing time; but if the workpiece surface has convex platform or tendon, the
tool and workpiece may collide if G99 is used; at this moment, G98 should be used to return Z axis to the start
point and then position next hole to ensure the safety. See the figure below.
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