On Monday 15 February 2016 19:08:34 Bertho Stultiens wrote: > On 02/16/2016 12:57 AM, Gene Heskett wrote: > > I am using some micro-mini roller lever junk I got for 6 bucks a bag > > of 10 from ebay. Repeatability according to my dials is well within > > .001" even with crap switches. Its a "dry' circuit, so as long as > > the contacts are clean, there's very little other wear. MMMV after > > a long time, but its not beem noticable in 6 months now. > > That is interesting. That would be better than 0.0254mm, which is in > the order of the machine step-size. > > I'd seen some reports on the net of repeatability in the order of > 0.005mm (~0.0002"), but the problem is that "hard" data is not > available. It is difficult to decide on anecdotal evidence. > > However, it seems that you have the same experience and the cheap > micro-switches are really good after all (that is, of course, a > relative statement of really good).
Yes it is, I tried to use them in the motor reversal and limit switch control of the jig flipper I had rigged to tip in and out a stopper that a board whose end was about to be carved was being located by it, < a 2 amp load. They were good for perhaps 20 or 30 cycles doing that. So I replaced them once, and then kept a screwdriver handy so I could reach over and give it some brogan maintenance when it miss-behaved. Then that part of the project was finished, so I tore down that jig & stored it up in the other shed. Hopefully I'll never use it again in this lifetime. OTOH for dry,logic level contacts, they've been fine. And since I've hit a roadblock in mahogany carving for lack of a cutting tool that should arrive this friday or saturday, so I am back to making an alu coated floor as I carve out a camera mount for this mill, which will supposedly be removable and re-installable without spending a couple hours recalibrating the machine. Dovetail joints etc. Looking a bit fugly on one side as I was pushing the tool too hard and too deep, so it walked sideways about 30 thou, amazingly without breaking a 1/4" 4 flute SC mill. The text in the MDI command line is so small I missed a missing decimal point, so I sat down and wrote a 2 loop nested proggy to do it in 40 LOC. Worked just fine. Tommorrow I need to drill & tap a few 3mm holes to serve as camera aiming adjustments & then it will be about ready for use. But if I see that guy Murphy that wrote all those laws about how things can go wrong, coming my way, he's dead, stone cold dead. ;-) Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
