Re: foam cutting current ?

As other people in the group the current to give the proper cut vary with the foam density and also with the speed of the cutting so I use to determine it experimentally.

I use a 12v / 24v transformer with double pole double side switch so I can select to send to the wire 12 or 24 volts and in the primare I feed with a dimer I use one that the knob is a on/off switch when I push it so the settins are keep and i make a trial cut with the foam and the speed and in that way I can get the settings if I put to much heat the with of the cut is to wide (as the foam melts) so I put the settings so the with of the cut is about 1/8" since I use this as the with of the too when I calculate the Gcode of the path.

As altenative of the nicromel wire you can use also steel wire (piano wire) that have better mecanical properties or if you had dificult time you can use metal guitar strings the first or the second with good results ( I already try them).

Have a nice day

Jose L Sanchez

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