> From: "shaji (s.) bhaskar" <bhaskar at bnr_ca>
> >From: Erik Olson <olson at phys_washington.edu>
> >When I picked up a bunch of nichrome wire for making my acrylic bender, it
> >came in a wide variety of thickness, including some fairly beefy big stuff
> >that had far too LITTLE resistivity. I'm certain some could be found in
> >the correct resistance. The problem here, as I said before, is lack of
> >insulation and succeptibility to breakage (maybe).
> To build a low-wattage substrate heater which generates about 1
> watt/foot of heat, it might be sufficient to just use airline tubing
> or something similar as insulator, as Steve Pushak suggested. Do you
> have any numbers on the range of resistances/unit length that is
> avaialble? How much does nichrome wire cost? And where can one find it?
Nichrome wire is incredibly cheap, but you might have to get it in a
spool. I got mine at the university's chemistry stockroom, because they
use it to make impromptu heaters for experiments. Sources? Maybe
industrial wire suppliers or chemical supply houses.
Resistance.. Hm, I don't have a handy table, but I am sure there is a LOW
enough resistance available. I know this because when I built my acrylic
bender (ran on 80-120V) I had to make the wire into a coil (using a drill
and a dowell). No doubt you can get a table of resistances from the
Erik D. Olson E-mail-o-meter:
olson at phys_washington.edu it's back up!