HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 272)

272 Programming: Q parameters
8.12 Pr
ogr
amming examples
N180 G00 Z+250 M2 * Retract in the tool axis, end program
N190 G98 L10 * Subprogram 10: Machining operation
N200 G54 X+Q1 Y+Q2 * Shift datum to center of ellipse
N210 G73 G90 H+Q8 * Account for rotational position in the plane
N220 Q35 = ( Q6 - Q5 ) / Q7 * Calculate angle increment
N230 D00 Q36 P01 +Q5 * Copy starting angle
N240 D00 Q37 P01 +0 * Set counter
N250 Q21 = Q3 * COS Q36 * Calculate X coordinate for starting point
N260 Q22 = Q4 * SIN Q36 * Calculate Y coordinate for starting point
N270 G00 G40 X+Q21 Y+Q22 M3 * Move to starting point in the plane
N280 Z+Q12 * Pre-position in spindle axis to set-up clearance
N290 G01 Z-Q9 FQ10 * Move to working depth
N300 G98 L1 *
N310 Q36 = Q36 + Q35 * Update the angle
N320 Q37 = Q37 + 1 * Update the counter
N330 Q21 = Q3 * COS Q36 * Calculate the current X coordinate
N340 Q22 = Q4 * SIN Q36 * Calculate the current Y coordinate
N350 G01 X+Q21 Y+Q22 FQ11 * Move to next point
N360 D12 P01 +Q37 P02 +Q7 P03 1 * Unfinished? If not finished return to label 1
N370 G73 G90 H+0 * Reset the rotation
N380 G54 X+0 Y+0 * Reset the datum shift
N390 G00 G40 Z+Q12 * Move to set-up clearance
N400 G98 L0 * End of subprogram
N99999999 %ELLIPSE G71 *