Óptica, enfoque y alineación

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• The red beam is visibly off centre, diverging or irregular in shape — check the optical path before anything else.
• Head alignment is off: a mark punched on tape does not sit concentric with the nozzle.
• Alignment is fine, so nozzle and beam path are concentric. Now close the shutter and run a job with the beam off — that separates a motion-induced capacitance alarm from a beam-induced one.
• Alignment is fine and the alarm still appears, so the trigger is almost certainly the cutting process itself rather than the mechanics.
• A full-reflection mirror has been fitted where the deflecting mirror belongs — a common mix-up after a rebuild.
• Contaminated focusing lens combined with a beam that has drifted off axis.
• On some heads the focus drifts fast. The usual cause is an unreasonable motorised-focus parameter rather than the lens.
• For rusty or film-covered material: reduce cutting pressure, lower the focus, replace the lens and add a descaling pass.
• Re-calibrate the standard cutting focus — do this after any lens change or head rebuild before tuning anything else.
• Focus values can also be checked inside the platform configuration tool, not only in the cutting software.
• Edge offset: a side distance difference of 2 means shifting the head right by 1. Right is X-positive, so the correction is X+1.