Pocket Size Hotwire Machine

this is my first instructable so i decided to enter it in the pocket size comp
its quite simple to make and mine cost nothing
you can use it for small craft/hobbie work and use it to cut through foam/polistyrene and any other small soft foam

all you need is
a small piece of ply wood
guitar string
9 screws
2 pins
disposible camera circuit
9v snap

soldering iron +solder
screw driver

Step 1: Cut the Wood

this here is just the basic construction of the frame
first cut the ply wood to 2 bits 10 cm long and 1.5 cm wide and 0ne to 5 cm long and 1.5cm wide

then cut the mdf to a 5 cm square you will be needing 2 of these as well

Step 2: Frame

assemble half of the frame but keep a piece off the mdf off
and screw or glue together

Step 3: The Circuit

for this step you will need your soldering iron and solder
your camera circuit and some wire
a pair off pliers also can help
first desolder the batterty contacts and solder the resistor and snap on
then take off the capaciter and solder two other wires
and on the wire butten on the back you will need to put a blob of solder on that

Step 4: Screw on the Next Piece of Mdf

leave the wires hanging out and put the two front wires on the pins 1.5 cm froim th top
twist the guitar string on to the pin really tight
screw on the last piece of mdf
connect a battery and then you are finished



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    11 Discussions


    9 years ago on Introduction

    Looks good - what bit of the camera circuit are you using, which guitar string, and what value resistor? L

    3 replies

    I wouldn't have thought so for steel wire. The current you'd get out of the transformer would be too low and I can't see the circuit handling that much power ? L


    9 years ago on Introduction

    Am I missing something? What exactly does this do? I've got a few guesses, but even if I'm right I'm sure I'm not the only one who would benefit from a a line or two about it's function.

    3 replies

    hi you can use it for small craft/hobbie work and use it to cut through foam/polistyrene and any other small soft foam hope this helps.

    That's what I thought, but you may want to add that in the actual instructable somewhere. Good job by the way.


    After reading that it sounds a little sarcastic, and I really don't mean it to be. I actually do think a note about it's use would be good.


    9 years ago on Introduction

    you use the whole circuit and you use the small guitar string (metal) and its a 250 ohm value resistor