I saw some prox sensors ebay (china trash) that folks on 3D printers are using for automatic bed leveling compensation. They are about $2.50/ea delivered, others are $10 if you want a better quality.
Their repeatability is good, If using switches, please check the brand. Microswitch and possibly Cherry make great switches. Some others are 'problematic' to be kind. Enjoy. On Mon, Feb 15, 2016 at 5:57 PM, Gene Heskett <ghesk...@wdtv.com> wrote: > On Monday 15 February 2016 18:44:00 Bertho Stultiens wrote: > > > Hi, > > > > I'm looking for an on-the-cheap way to do reasonable homing. Usual > > switches for the purpose cost a lot. The machine only has a > > repeatability of 0.02mm, so it may just be a waste to use too accurate > > (expensive) switches. > > > > Has anyone numbers on the repeatability of "normal" micro-switches? > > > > Micro-switches are (relatively) cheap and mostly not too shabby, but I > > have a not seen any hard data on repeatability (other than datasheets > > saying that they are made for repeatability). > > 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. > > 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 > -- ><> ... Jack The Four Boxes of Liberty - "There are four boxes to be used in the defense of liberty: soap, ballot, jury and ammo. Please use in that order." "Whatever you do, work at it with all your heart"... Colossians 3:23 "Anyone who has never made a mistake, has never tried anything new." - Albert Einstein "You don't manage people; you manage things. You lead people." - Admiral Grace Hopper, USN "The most dangerous phrase in the language is "We’ve always done it this way"-- Admiral Grace Hopper, USN "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Ben Franklin ------------------------------------------------------------------------------ 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
