A simple circular pocket milled into the workpiece with a single full-circle G02 arc. Great first look at how arc center offsets (I/J) define a circle. Two depth passes clean up the bottom.
;; ============================================================; CIRCLE POCKET / BORE; ============================================================; Cuts a 50mm-diameter circular pocket 4mm deep into the stock.; Tool: End Mill Ø6 (T1) — general purpose.; Strategy: plunge to depth, single G02 full-circle pass per Z step.;%G21 G90 G17 ; mm, absolute, XY planeT1 M06 ; load tool 1 (End Mill Ø6)M03 S1200 ; spindle ON, 1200 RPM, clockwiseG00 Z5 ; rapid to safe retract heightG00 X25 Y0 ; rapid to circle start (rightmost point, r=25)G01 Z-2 F50 ; plunge to first depth, slow plunge feedG02 X25 Y0 I-25 J0 F150 ; full circle CW (center offset I-25 J0 -> center at origin)G01 Z-4 F50 ; plunge to final depthG02 X25 Y0 I-25 J0 F150 ; second full-circle finish passG00 Z5 ; retract to safe ZM05 ; spindle OFFM30 ; program end & rewind