PECK DRILLING CYCLE   Return to question and answer page

The above illustration shows a typical canned drilling cycle, represented by a single line of G-code.   The drill descends rapidly to a safety level (R) a short distance above the work surface.   The computer turns on the drill, and it descends at the desired feedrate a specified distance below R.  Then the computer turns the drill off as it rises rapidly until it clears the work surface.  This clears the chip, and exposes the drill point to additional coolant, if used.  The drill is turned on again, and descends rapidly to the next lower R level.  The drill is turned on and the drill again descends at the programmed feed rate.   The cycle is executed a sufficient number of times for the drill to reach the finished level, where it turns off, and rises rapidly to the top R.   Then it goes on to the next programmed hole location.   All variables involved in the canned drilling cycle are user defined in a single line of G-code, such as this:   G83 R.1 Z-.6 Q.125 F1.25   Where:   R=distance of safety point above work surface Z=distance of finished level below work surface (a negative number) Q=depth of each pass F=feed rate in inches per minute