On Wed, 24 Jan 2018 23:18:05 -0500 Dave Cole <linuxcncro...@gmail.com> wrote:
> On 1/24/2018 7:38 PM, Chris Albertson wrote: > > On Wed, Jan 24, 2018 at 4:06 PM, Dave Cole <linuxcncro...@gmail.com> wrote: > > > >> That is likely an unshielded prox switch. That means that the sensing > >> pattern is a blob that sits right at the base of the plastic tip, not > >> above it. > >> That means that they can also sense to the side of that plastic tip as > >> well. You need to be careful that you don't have any metal next to the > >> plastic tip. > >> > >> The prox switches which do not have a plasic tip, but where the plastic > >> tip is within the sides of the metal sensor tube are considered shielded > >> prox switches. They only sense above the tip and not to the side. Their > >> sense pattern looks like a short flame that comes out of the tube. > >> > >> I tend not to use unshielded proxes as they can trigger sometimes when you > >> don't expect it due to brackets nearby etc. > >> > >> Its amazing that they can sell those for just over $2 bucks.. Crazy cheap! > >> > > When these show up I will test there pattern my intentionally misaligning > > them. But if used for a machine end-stop the target can be pretty well > > controlled. > > > > That is $2 with FREE shipping from China. It is pretty much the standard > > price, not a special deal. > > > > Factory workers in China make about $3.50 per hour so $2 retail allows for > > maybe 5 minutes of labor per unit. Reasonable if the factory is automated. > > > > I was watching a video id Apple MacBook cases being milled from billet. > > The Mac has just one structural part, the unibody case itself. These are > > made literally by a millions from one foot diameter aluminum "logs" that > > are the size of utilty poles. VERY little human labor is required, the > > "logs" are pressed into plates, cut and milled by a special purpose > > machine. So even with labor at $3.50/hour they don't use much labor. > > > > A lot of people don't understand what is going on in China. They have a > lot of automated production plants there and they are building more. I > was there this last spring installing 1 of 3 robotic cells that were > being installed at about the same time. The plant is an automotive > supplier for a nearby car plant. The plant has numerous robots. Very > few people work at the plant, and it runs 24x7. What more could you > want as a manufacturer; cheap labor, a growing skilled labor force, > automation, and low electric rates. Sounds promising, I do not want to compete with low salary. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
