New Stupid PIC Trick
Wagner Lipnharski email (remove spam text)
The correct name is "Polycarbonate", also known as "Lexan". It is used
to build bullet proof windows and protect place where possible vandalism
is present, like for example the front of any soft drink vending
machines front translucid material (picture inside). You can find
polycarbonate mostly in signs shops and at companies who produce panels
and displays. It is more expensive than cheap acrylic.
Here goes a doubt. I tried to use plain acrylic to build some moving
parts on a machine I was building, and noticed that plain acrylic just
break easily, since it is very dry and rigid. As an experiment, I made a
screw thread directly into the acrylic, turned a screw into it, and
applied a single drop of PROLOK (Thread Lock) in few minutes the acrylic
part was in pieces. The PROLOK just use the empty space at the screw
thread, expanded and created such pression that just made the acrylic in
pieces (it works pretty well in metal), it just cracked all around,
centered at the hole.
Then I purchased a clear material named "PLEXIGLASS" (and here goes the
confusion with the name), it is not dry or very rigid, it bends easier
than plain acrylic. Screw holes at this material is super-dee-duper,
since if you make the hole a little bit smaller, when turning screws you
can hear it squeezing and yelling itself into the hole, it looks like
that the material will crack, but no, it stands pretty, pretty well, it
expands and holds the screw very tied. I suspect the name PLEXIGLASS is
also the same of Lexan or Polycarbonate (this is the technical name).
Plexiglass (Lexan, whatever) works as a bullet proof material, since it
doesn't break or crack, instead it deform with the bullet, and as the
bullet pushes the material forward, the material just goes involving the
bullet, and as much it involves the bullet and the bullet pushes it
forward, more stronger it goes "bitting" the bullet, so increasing its
strenght, so the bullet just transfer all its energy as heat into the
lexan. It is a high impact material, even that you can practically
drill a hole just using the drilling bit and your hand to turn it...
One common difficult about those products is how to glue it. Several
suggestions are done, in real no one did show to work nice and easy. I
use screws all around.
I hope someone could clarify the mess with the names. Today I can
recognize one or another by its smell, dry acrylic is nasty, the good
one smells like plastic.
Richard Ottosen wrote:
See also: www.piclist.com/techref/microchip/devices.htm?key=pic
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