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Hot wire foam cutter
Thank you for this article about your experience with a hot wire foam cutter. I like how you mentioned all of the needed equipment. This would help project enthusiasts save lots of time. Something else to think about would be to wear safety equipment to avoid any accidents. http://www.sagecheshire.com/cncfabrication.html - JadeB27
I made one, with kanthal heating wire I had for vaping and a 10v DC power pack, but I'm having an issue. The foam melts/shrinks too far making it impossible to cut to accurate dimensions. I increased the length of the wire so that it is no longer glowing red, but I have the same issue. - AaronH118
Here's my experience:The idea of a dimmer and transformer didn't make sense to me and didn't work for a lot of people, so I went with a car battery charger with a 2A current limit setting. This worked, but the guitar string broke after about 30 seconds. I tried 3 different strings of different gauge and composition with the same result. I finally got some 22 gauge nichrome wire. At 15 inches it is 1.1 ohms cold. At 2A this would be around 4.4 watts (W=I^2*R), which doesn't seem like enough, but actually it gets plenty hot and works fine. I vaguely remember that light bulb resistance goes up by around a factor of 10 when it heats up. Maybe that's what's going on - a 44 watt light bulb would be plenty hot. Probably a much lighter gauge would work fine as well, but may not be as strong. The wire does get loose with heat. Instead of the ingenious tensioning method described, I used a guitar tuner, which I can tighten when the wire heats up and loosen after using. This thing cuts through styrofoam like butter.I'm thinking about making a contraption that will run between the chuck and the base hole of my drill press (properly insulated!) so that I can get more accurate right angle cuts by guiding the styrofoam through it.
Hi! I just saw this video tutorial about how to make a simple and handy foam cutter, and they only use 2x AA 1,5V batteries. It seems a lot cheaper and easier, why? What is the difference if we are using a transformer or not? Is it due to the type of string they use (nichrome wire)? Thanks!
The End of the Chip Clip
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