Optics, focus and alignment

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• The red beam is visibly off centre, diverging or irregular in shape — check the optical path before anything else.
  Original record

  红光肉眼可见偏离，光束发散或形状不规则。

• Head alignment is off: a mark punched on tape does not sit concentric with the nozzle.
  Original record

  切割头对中异常，在胶带上打点并没有和喷嘴同心。

• 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.
  Original record

  切割头对中正常，可以确定喷嘴和光路同心。把光闸关闭，进行不出光加工测试，判断是否是运动引起的本体电容变小报警。

• Alignment is fine and the alarm still appears, so the trigger is almost certainly the cutting process itself rather than the mechanics.
  Original record

  切割头对中正常，表明喷嘴与光路同心，基本可以确定是出光加工引起的报警。

• A full-reflection mirror has been fitted where the deflecting mirror belongs — a common mix-up after a rebuild.
  Original record

  全反射安装在了偏转镜的位置

• Contaminated focusing lens combined with a beam that has drifted off axis.
  Original record

  聚焦镜脏污、激光同轴偏移

• On some heads the focus drifts fast. The usual cause is an unreasonable motorised-focus parameter rather than the lens.
  Original record

  一般普雷的焦点变化比较快，常见是电机变焦设置参数不合理导致

• For rusty or film-covered material: reduce cutting pressure, lower the focus, replace the lens and add a descaling pass.
  Original record

  减小切割气压，降低焦点，更换镜片，增加除锈工艺

• Re-calibrate the standard cutting focus — do this after any lens change or head rebuild before tuning anything else.
  Original record

  校准标准切割焦点

• Focus values can also be checked inside the platform configuration tool, not only in the cutting software.
  Original record

  也是去平台配置工具查看焦点设置

• 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.
  Original record

  侧边距离差是2，需要将切割头右移1，右方向为X轴正方向，即为X+1