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.
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