Canned Cycle

A canned cycle is a predefined CNC control routine that executes a repetitive machining pattern from a single G-code command, commonly used for drilling, tapping, boring, reaming, and similar repeated features. It allows the programmer to define motion once and repeat it at multiple coordinates without writing every plunge, retract, and feed move individually. The cycle remains modal until canceled with G80, ensuring consistent motion across parts.

In practical shop-floor use, a canned cycle lets the programmer define the motion once, then repeat it across multiple coordinates without writing every plunge, retract, and feed move individually. On mills, this is most often used for holemaking: the operator selects the plane, calls the cycle, sets parameters such as depth, retract height, feed, and dwell if needed, then repeats the cycle at each X/Y location until the pattern is complete. The main value in CNC cell production is reduced code length, faster programming, and more consistent motion because the controller executes the same stored sequence each time. Many controls require cancellation with G80 after the last hole or feature, because the cycle remains active until explicitly cleared. The cycle acts relative to the active plane, and the retract value is defined along the axis perpendicular to that plane, which matters when switching between XY, YZ, or XZ operations.