How to Design a Water-Resistant Sapphire Watch Case: Gasket Grooves, Screw Load, Crown Sealing and Pressure Testing
A transparent sapphire watch case creates a very different engineering challenge from a conventional stainless-steel or titanium case. The material is extremely hard, highly scratch resistant and optically transparent, but sapphire is also a brittle single-crystal material. It does not tolerate localized stress, sharp internal corners or uncontrolled screw loading in the same way as…
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