how to make polystyrene cutter
HI!
Take a nicrome wire (one of those used with 220V AC line,you can find one in every electrical materials shop, usually come in spiral form)
Cut a part of it about 25 cm longand make it a straight line.
Then fix the ends of this part with the positive and negative terminals of a PC power supply,yellow and black wire so you use +12v voltage.It would be better if you fix initially also a ampermeter in series to monitor the current,too much of it would burn the wire whether a very low current wouldn't make the wire hot enaugh to cut the polystyrene,that's why i told to use a piece of 25 cm about for me it worked.
I fixed the ends of the nicrome wire in a vertical colon,one of those used for the driiling machines,the lower side in the basement of the colon and the upper in the moving part which i keep under mechanical tension by lowering it a litle while fixing the nicrome wire and then releasing it.In this way the wire will be perfectly straight as it is pulled from both sides.
Power on and start cutting.
P.s. If the wire isn't hot enaugh or you want to cut a little bit faster just make the nicrom wire a little bit shorter.
regards
maXer
Added after 6 minutes:
whoops this was not what you wanted ...
anyway maybe somebody else needs it...
i did not understand very well what you wanted to do ...
regards
maxer