On 19 December 2014 at 06:39, Robert Dvoracek wrote: > I believe this would fall under the category of standing waves, which are > affected by all kinds of things, up to and including the way the operator > holds its mouth during the "sound off". A single well placed self-tappin= g > screw is nearly as fast and allows later disassembly. Unless of course y= ou > really need a hermetic seal for waterproofing, etc. In that case, a > weighted object near the sensitive component(s) to dampen the vibrations > may help. As others have mentioned, post assembly testing would be key > here. > > And you MUST be aware of where Lorenz's butterfly* is at the time, not to mention Mr Schroedinger's furry feline friend. FWIW "waterproofness" does not exist, but welding helps heaps. Russell * At the critical value, both equilibrium points lose stability through a H= opf bifurcation .[12] When [image: \rho =3D 28], [image: \sigma =3D 10], and [image: \beta =3D 8/3], the Lorenz sys= tem has chaotic solutions (but not all solutions are chaotic). The set of chaotic solutions make up the Lorenz attractor, a strange attractor and a fractal with a Hausdorff dimension which is estimated to be 2.06 =B1 0.01 and the correlation dimension estimated to be 2.05 = =B1 0.01. The Lorenz attractor is difficult to analyze, but the action of the differential equation on the attractor is described by a fairly simple geometric model. Proving that this is indeed the case is the fourteenth problem on the list of Smale's problems . This problem was the first one to be resolved, by Warwick Tucker in 2002. This is almost certainly of minimal if any relevance to the problem at hand, but, most other things considered will be too. Finding what's not is the sort of thing that engineering is all about. And there you were thinking that this was a wholly irrelevant add on! Thank you for reading me. http://en.wikipedia.org/wiki/Lorenz_system > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .