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33GENERAL DRILLING HANDBOOK%u00bd%u0009Technological Drilling MethodTechnological drilling methods or drilling cycles are defined motion processes (G-codes) for drilling in accordance with ISO 6983-1: 2009 standard. There are several drilling cycles differing in the technological process and thus in their parameterization. The most used drilling cycles are G81, G73, G83. The placement of the drill at the end of drilling cycle is defined by G98 or G99 code. When G98 is active, the drill will return to the initial point at completion of a single operation. When G99 is active, the drill will be returned to the drilling cycle start point when the canned cycle completes a single hole. Generally, using G98 is provided in case there are obstacles between the holes such as clamps or other features of the part.G81 - Basic Drilling Cycle (without Pecking)This cycle assumes continuous movement of the drill throughout the cycle.The drill starts moving from the initial point to cycle start point with rapid feed and then continues moving to the defined depth at the set feed, the drill retracts with rapid feed.G81 with G99 G81 with G9812345 12 534%u2014 rapid feed %u2014 set feed1-2 %u2014Rapid traverse to the X, Y coordinates of the drilling hole center2-3 %u2014Rapid traverse to the drilling cycle start point3-4 %u2014Drilling process to the defined depth at the set feed4-5 %u2014Drill retracts with rapid feedSyntax: G81 X%u2026 Y%u2026 Z%u2026 R%u2026 F%u2026Parameter DescriptionX hole position in X-axisY hole position in Y-axisZ drill hole depthR cycle start pointF feed rateExample:G98 G81 X15.5 Y20.5 Z-10.0 R0.5 F150orG99 G81 X15.5 Y20.5 Z-10.0 R0.5 F150