A: meaning: A-axis of machine B: meaning: B-axis of machine C: meaning: C-axis of machine D: meaning: tool radius compensation number F: meaning: feedrate G: meaning: general function (see Table 5) H: meaning: tool length offset index I: meaning: X-axis offset for arcs / X offset in G87 canned cycle J: meaning: Y-axis offset for arcs / Y offset in G87 canned cycle K: meaning: Z-axis offset for arcs / Z offset in G87 canned cycle L: meaning: number of repetitions in canned cycles / key used with G10 M: meaning: miscellaneous function (see Table 7) N: meaning: line number P: meaning: dwell time in canned cycles / dwell time with G4 / key used with G10 Q: meaning: feed increment in G83 canned cycle R: meaning: arc radius S: meaning: canned cycle plane / spindle speed T: meaning: tool selection X: meaning: X-axis of machine Y: meaning: Y-axis of machine Z: meaning: Z-axis of machine