On 17 February 2016 at 17:14, Dave Cole <linuxcncro...@gmail.com> wrote: > Prox switches are just the opposite. Most are even waterproof. > Prox switches are becoming very cheap. Someplace is trying to sell me > some for about $10 each with a cable. > I've used Prox switches on very expensive machines for homing and limits > and they just work. No call backs.
Those must be the expensive ones :-) http://www.ebay.co.uk/itm/390880485798 as a random example, that's about $5. NPN work better with parports and mesa cards (not sure about Pico). They almost all need a >5V power supply, but NPN ones look like a switch-to-gnd to 5V logic, so that isn't a problem. I run mine at 12V because it is convenient. Note that they come in a variety of diameters and detection distances, and that there are two types. The one in the link above will _not_ work if embedded in an iron casting. This type, where the threaded portion reaches right to the end (called "shielded") will work in that situation. http://www.ebay.co.uk/itm/121776227835 These have a shorter detection distance. I have recently been tending to use these embedded into the machine out of harms way and picking up on drilled holes in the slideways as targets. I do try to find non-bearing surfaces, of course. There are two here: https://picasaweb.google.com/108164504656404380542/HarrisonMill#5989135693933177186 There is also an alternative mounting style that might be very convenient for an extruded-frame machine: http://www.ebay.co.uk/itm/121766473917 -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ 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
