On Jan 15, 2009, at 10:11 PM, Tom wrote: > Dave Engvall <dengv...@...> writes: > > snip... > >> One trick is to machine the part out of plexiglas and then heat to >> stress relieve. >> Then stress the part and view with polarized light; one can see the >> stress points and engineer the >> design to compensate from that knowledge. >> > > > Hi Dave, > > Wow! Thanks for the idea. I have designed & made R/C aircraft parts > before, and > have been asked to do some full-scale work (manufacture, not > design). The > stressed plexi sounds like a super idea.
Long time ago, when I had to learn glassblowing, we had this device to view the stresses in the glass. It consisted of 2 polarizing filters. Not so long ago, I wanted to see stresses in some microscope sample glasses. But, where to get polarizing filters at once? Fortunately I had a broken LCD monitor. Inside it are 2 huge, well, as large as the screen, polarizing filters. These are glued onto a screen, so you have to peel them off. Getting started is hard, but it will become easier. So, if you want to make a large polariscope, find a LCD monitor, get the filters out and glue them on a piece of glass. I googled this about polariscopes: http://www.ecu.edu/glassblowing/glassstress.html That should make it clear. One remark about the triple clamp. If you really want it to be hollow, why don't you use the same thickness all around the tube? The outside thickness is at least twice that of the inside diameter. Dirk ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
