murrayec Posted April 28, 2015 Share Posted April 28, 2015 Hi Here are the photos of my home spun Hot Wire Foam Cutter;- The table was based on the size of the Proxxon one, great for small stuff but not for big sheet. After making and using this I recommend a table of at least 3 times the size if you have the space, and at least 400mm high- that is the length of the cutting wire. The fence guide is shown;- 30mm aluminium angle fence clipped to the board edges. The table is marked out with lines at 10mm ctrs to aid squaring the fence to the table if required. The arm is 19mm aluminium rod with ms fixings, the upper hot wire connection to the arm can be moved back to set the wire at an angle to the table- this arm allows a max angle of 30deg. A sliding fence is shown;- for trimming foam lengths square to the left edge of the board. Its two aluminium angles stuck to a 45deg set-square, one faces down to catch the edge of the table, the other facing up to push the foam into the wire. I also use an adjustable set-square to set different angles for cutting. Note- you need some form of adjustment on the arm so that you can square up the cutting wire perpendicular to the table and perpendicular/parallel to the left edge face of the board. I always use the left edge as my datum to keep things square. The last photo is of the controller;- it's a two stage heavy 6v transformer, it works 6v and 12v. The twelve volt is achieved by connecting the two stages together giving 12v at high current- that's controlled by the toggle switch.* The stat varies the voltage in both 6v and 12v modes, its just a standard household light dimmer switch. 12v at high current is used with the thicker hot wire material, it's about .8mm and holds the shape its bent into, even when glowing RED!. I tried to run the system with the 12v workbench power supply under my controller in the photo- it was fine with the thin wire but it could not heat the .8mm wire at all and began to make a loud hum! So I built my own. When cutting irregular shapes I print out the part from the drawings on heavy paper, cut it out and then pin it down on the foam and use the edge of this template to cut out the foam shape. It takes a bit of practice to cut the foam like this, trying to rotate the foam on the table, move it by the wire at a constant rate and keep to the edge of the paper template- practice makes perfect. 1 Quote Link to comment Share on other sites More sharing options...
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