7 Dec
2014
7 Dec
'14
5:05 p.m.
Many years ago I worked with an improvised hot-wire foam cutter, used to
cut 4' thick EPS (Styrofoam) slabs. The wire itself was around 6' long, and
ran vertically.
The electrical side consisted of only the ni-chrome wire, a Variac, a fuse
or CB and AC wiring. Whoever spec'd out the thing chose a wire that, at 6'
long, was fine with somewhere between 20V and 120V AC - I never really
noticed where the Variac was set, somewhere mid-range though.
On the top end, the wire was attached via a long-ish turnbuckle to an
insulator secured to a ceiling truss. The hot wire penetrated the work
surface (a table made of two 4x8 sheets of plywood) near the center
(passing through a metal guide plate with a small hole) and was firmly
secured somewhere beneath. The turnbuckle up top was used to set tension on
the wire.
On Sun, Dec 7, 2014 at 1:09 PM, Chuck Guzis <cclist at sydex.com> wrote:
On 12/07/2014 11:47 AM, Bob Vines wrote:
Does anyone have instructions or a schematic (or
a pointer to a URL)
on how to make a "hot wire" device to cut the PVA bond between a CRT
and its safety lens? What kind of power supply (how much power), "hot
wire," etc.?
Do an internet search on "hot wire foam cutter". You'll turn up several
DIY YouTube videos, Instructables and even low-cost retail ones.
Take your pick--it's neither difficult to make you own or expensive to
purchase one.
--Chuck