September 17, 2025

Defining and tolerancing freeform surfaces for manufacturing

Key Points

Effective tolerancing is crucial for integrating freeform surfaces in manufacturing, ensuring better control over sensitivities.
Understanding vendor capabilities can enhance the design process, ultimately aiding in more efficient manufacturing timelines.
Incorporating limits of metrology devices into tolerancing ensures that freeform surface specifications align with manufacturing capabilities.
Early vendor interaction in the design phase can significantly streamline the manufacturing process for freeform optics.

Abstract

The adoption of freeform optics by designers and manufacturers has increased in recent years. With the increase of flexibility, a freeform surface can bring a system, it also brings more sensitivities. To effectively control these sensitivities during integration, the tolerancing needs to incorporate the limits of the metrology device for the tolerance operand under test. Understanding a vendor's manufacturing and metrology capabilities is critical to designing and tolerancing a freeform surface that uses its physical features to aid in integration. Interfacing with a vendor early in the design process may improve manufacturing timelines due to the alignment of the freeform definition with the available metrology. Favorable freeform definitions will be reviewed along with tolerancing and specification recommendations.

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