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.
Summary of Contents for CNC9640
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Page 21: ...ADTECH9 Series CNC Programming Manual Workpiece Coordinate System Diagram ...
Page 44: ...ADTECH9 Series CNC Programming Manual 2 Occasions that inner corner rotates ...
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Page 62: ...ADTECH9 Series CNC Programming Manual Manual insertion ...
Page 65: ...ADTECH9 Series CNC Programming Manual Tool radius compensation start and axis Z cut in action ...
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