Designing that case is tedious work, but I'm beginning to feel that I'm getting somewhere. But first, there's something important that needs proper consideration: screws.
When looking for small screws, it's surprisingly difficult to find detailed specifications. While Alibaba and friends are full of offers of little Torx screws for iPhones (NB: Apple nowadays uses pentalobe screws), Blackberry, etc., there's hardly a shop that actually provides a specific geometry. In general, it seems that Torx T5 is a good compromise between size and availability. I.e., most of the screws used in mobile phones seem to have a T5 drive. So, what's the typical T5 screw like ? The answer is that there is none. Drive (slotted, Phillips, Torx, ...), head shape (cylindrical, conical, round, and all sorts of fancy variations), thread, and length, while all being related to each other, can appear in many combinations. Eventually, I found a combination that appears in several places: Torx T5 drive with a M1.6 thread. The smallest head for this type of screw seems to have a diameter of 3.0 mm and a height of 1.2 mm - small enough for Anelok. This leaves the length. I found a lot of useful information in the flyer for EJOT DELTA PT screws: http://www.ejot.com/medias/sys_master/products/products/8797562339358/Info-Flyer-DELTA-PT.pdf So for M1.6, we can have a length from 3.5 mm to 16.0 mm. Next: the design so far. - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
