Specifications

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CONCISE GUIDE FANUC 96
N20 G92 S2500 ; Back spindle revs limitation
N21 G96 S150 M204 ; Back spindle cutting speed
N22 G0 X103 Z0 M8
N23 G1 X-0.5 F0.25
N24 G0 X90 Z-2
N25 G1 Z0 ; Machining on back spindle side
N26 X92 Z1 F0.3
N27 Z15 R2
N28 X100 Z20 F0.15
N29 G0 X200 Z-200 M205
N30 M30
Machining with the back spindle is exactly the same as with the main spindle ; the same ISO functions,
same Fixed Cycles. Attention must be paid to the axis Z sign, which for the back spindle will be positive for
machining and negative for approach and separation. We also advise the use of different origins on the
first and second spindle (e.g. G54 on the main spindle and G55 on the secondary one). The passage of
the part between the main spindle and the secondary spindle takes place by means of three macro which
have been prepared by Graziano:
• O9100 => Workpiece change-over macro with parting off
• O9101 => Workpiece change-over macro with parting off but no extraction
• O9102 => Workpiece change-over macro without parting off
EXAMPLE OF PIECE EXCHANGE FROM MAIN SPINDLE TO BACK SPINDLE
….(Machining side main spindle)
M10 (Spindle and back spindle rotation enabling with open jaws)
M269(Confirm back spindle opening jaws)
G97 S500 M4 (Spindle rotation for synchronism)
M71 (Synchronism between spindles in speed and phase active)
G0 B- …(back spindle for piece exchange positioning)
M268 (closing back spindle jaws)
M69 (Opening spindle jaws)
G0 B0 (Positioning back spindle for further machinings)
M72 (Synchronism between spindles not enabled)
M11 (Spindle and back spindle rotation with open jaws not enabled
…..(Machining side back spindle)