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--- projects:glass_sphere:housing [2019/01/05 02:16] – created tjhowse
+++ projects:glass_sphere:housing [2019/01/05 08:54] – tjhowse
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 ====== Material selection ======
+=== Glass ===
 Glass is pretty good. When tempered and treated it's pretty shock-resistant, can handle a wide range of temperatures, handles radiation.
+== Toughening ==
+Tempering glass makes it strong. I've done this already on the leaf-in-glass project. Also soaking in molten potassium nitrate at 300 degrees for a while. This [[https://patents.google.com/patent/US3445208|patent]] describes a process which uses all kinds of nasties dissolved in the liquid KNO<sub>3</sub>. I'm not going to risk fluoride poisoning.
+====== Geometry ======
+== Overall ==
+I think the most robust shape would be a sphere. Every other shape has points or edges that would lead to higher peak stress when dropped.
+== Assembly ==
+It's gotta have a hollow bit in the middle for the electronics, but I want it to be as close to solid as possible. My current plan is to create the sphere in two unequal halves, one with a void in the centre for the electronics and the other part caps off the hole.
+====== Shielding ======
+Some of the cooler options for electronics inside the sphere require microcontrollers and flash storage, which would have their effective lives extended with some radiation shielding. I'll use a leaded potting compound (if it exists), or lead sheets wrapped around the electronics.