For a standard plano-convex (PCX) CO₂ laser focusing lens, the correct installation is generally:
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Convex (curved) side: Faces UP, toward the incoming laser beam.
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Flat side: Faces DOWN, toward the material being engraved or cut.
Installation Steps
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Turn off the laser and disconnect power before accessing the lens assembly.
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Remove the lens holder or lens tube according to the machine manufacturer's instructions.
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Identify the curved and flat surfaces of the lens.
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Position the lens with the convex side facing the incoming beam and the flat side facing the workpiece.
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Secure the retaining ring gently. Do not overtighten, as excessive pressure can damage the lens.
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Reinstall the lens holder and confirm that everything is properly seated.
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Check focus and alignment using the machine manufacturer's approved procedure before cutting or engraving.
Important: Handle the lens by its edges, preferably with clean, powder-free gloves. Avoid touching the optical surfaces.
For a meniscus lens (curved outward on one side and inward on the other), the convex side also generally faces the incoming beam, while the concave side faces the workpiece.
