On 24 January 2013 18:27, Gene Heskett <ghesk...@wdtv.com> wrote: > On Thursday 24 January 2013 11:05:42 Todd Zuercher did opine: > Message additions Copyright Thursday 24 January 2013 by Gene Heskett > > > Add a spring to your contact, to give it a degree of compression. > > > I did, in a previous design, mount the pcb on grommets so there was room > for crush. but found it near impossible to get a consistent spring back. > Or if off center, a consistent restoration to level. a 4 grommet mount > would have solved that, but the frame of that gage didn't have room. So I > wound up insulating the pcb being carved in a pocket of micarta, and > g38.2'd the pcb I was carving, which worked very well indeed. > > Like T. Edisons & his light bulb, he found 10,000 ways it didn't work. > > All my current problems regarding this would go away if the switch > hysteresis backup move would just do another 5 thou of back away anyway if > it found the switch open when it checked instead of freezing in place and > fussing with a big red error advisory because the switch was found to be > already open as it started the back away move. HINT, HINT. IMO, the only > error here is in the assumption that the home switch is mechanical, with > several tens of thousandths on an inch, or in metric, possibly a whole mm > of hysteresis. Perhaps even a per axis keyword to make it work either way? > Would seem to give maximum flexibility at any rate. > > > How about using a proper travel limit switch. The contact operates well within the first mm, and then you can press it a further 5mm or so with no ill effect. And on release the hysterisis is very short...
http://www.galco.com/buy/Eaton-Cutler-Hammer/E47BMS04 http://www.galco.com/buy/NTE-Electronics/54-438-BP Regards Roland ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
