For the straight edges, I put it on a flat surface and ran the hot knife right along the edge of a metal ruler. I was looking for it but somehow missed it. Some people set up their cutters in sort of a bandsaw configuration, so that small pieces can be manipulated against a table for precise cutting. 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. Amazon's Choice for foam cutting hot knife. Cut the craft foam into your desired shape. Heavy Duty Hot Knife. offers 934 hot knife to cut styrofoam products. Good question. Draw the knife's blade over a plain candle to wax it thoroughly and then cut Styrofoam with long, sawlike motions. Now we need to install the mechanism that keeps the the legs square to the wire. Use one washer on the screw head side and two on the nut side, as shown in the second picture below. so that I can get more accurate right angle cuts by guiding the styrofoam through it. Reply 7. GOCHANGE Foam Cutter, Cutting Machine Pen Electric Hot Knife Foam Cutter With Button and Power Light, 100-240V/15W Hot Knife 10CM Styrofoam Cutting Pen with Electronic Voltage Transformer Adaptor 3.9 out of 5 stars 403 I've read that cutting slower and cooler makes a smoother cut. I finally got some 22 gauge nichrome wire. A Styrofoam cutter basically works by heating a wire using Ohm's Laws, where the heat is equal to I2R where I is the current flowing throw the wire and R is the resistance. Very nice build. I use a hot knife to cut the Styrofoam cement forms in basements for installing the electrical circuits. If you use a hot knife or a hot wire, be sure to check the type of foam that you are using to verify that it is safe kind to be cut by these. 9. I tried 3 different strings of different gauge and composition with the same result. With the wire I used that's about 1/4 or 1/3 of the full rotation. And yet, this chemical is highly pervasive and apparently finds other ways to enter the body besides the lungs. Multitester (you don't NEED one but it's a good safety check) 10. The 3-Inch Hot Knife will cut better because it gets hotter.. Here are some freehand and template-cut shapes to give you an idea of what the tool does. They are very expensive, but worth the price, because you can control voltage from very, very, low to very, very, high. Cut firmly but not so deep as to tear the Styrofoam. It might help to use pliers to keep good tension, but be careful not to pull too hard and break the wire. The wire was stretched to keep the tension on the wire so that it won't get deformed while cutting. Adjust the dimmer switch for the most efficient cutting speed. This thing cuts through styrofoam like butter. When the piece is loose, remove it. An electric guitar string, about .10 - .16 size. See this page for an example: enclosure for the transformer and dimmer needs to be more rugged, and it should incorporate a fuse, maybe a power indicator, and maybe a modular connector to facilitate attachment of larger or smaller cutters.Instructables user Moofie suggested rigidifying the connection to one of the legs, perhaps simply by using a second bolt where the yardsticks overlap, to eliminate the need for the criss-cross strings. It should slice smoothly into the foam. If the wire is not super tight at this point, don't worry. offers 282 styrofoam hot knife cutter products. 8 years ago Even if it would work you’d struggle to get sufficient power to melt such a dense material so quickly. The black two conductor wire on the left goes to the wall plug, and the brown one on the right goes to the hot wire. At the same time, it should be sharp enough to be able to cut through the foam without much effort. Measure and cut the pegboard to make a tabletop. You shouldn't have to push very hard. Source(s): Basically just the tip each pass and make multiple passes. The old-fashioned heavy type of transformer is the kind you can use with a dimmer to control the output. The hot knife comes with a depth adjusting sled to make … If you turn up the dimmer too fast, your wire may burn out before you realize that it's even hot. This 130 watt, heavy-duty hot knife cuts foam, EIFS, ICF, nylon rope, webbing, synthetic fabric, and plastics. Your guitar string should have a sort of a bead (for lack of the proper name) on one end. Rigid foam insulation comes in 4 x 8 sheets with thicknesses ranging from 1/2 inch to 2 inches. As the wire is passed through the material (workpiece) to be cut, the heat from the wire vaporizes the material just in advance of contact. I want to cut a lead block by using the hot wire process. There are several hot knife foam cutters in the market but the heavy-duty cutter is limited. on Introduction. Having no money, I cut through five-inch-thick foam sections by making repeated swipes with a cheapie utility knife like the one above. Thanks. Place a Styrofoam ball on a newspaper-covered work surface. We first start by cutting a PVC pipe, I had a 2 feet foot long one so I needed to cut into the following length. Install a lath on a stud, then install a panel. I used my cutting board to make sure my lines were straight and square. This makes it quick to disconnect the wire and run it through a closed hole in the workpiece to make interior cuts. Cut polystyrene foam with an electric kitchen knife. Check em out. Lead conducts electricity so will short out the wire as soon as it touches. Didn't need to make precise cuts. Foam cutting works because the foam shrinks where the wire cuts it (the bubbles in the foam collapse), so even though the melted foam re-hardens, a gap is left where the wire passed through. 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. Craft knives or utility knives are surgically sharp and this makes them a good choice for cutting memory foam. CDN$ 69.69 CDN$ 69. You can always add more if it seems too floppy when you try to make your cuts. The PVC Table Screwand End Cap was actually 3D printed as I was not getting in the local market so I designed my own in Fusion 360. An inside cut involves the removal of some of the styrofoam, but still having a solid outer piece. KD-5H Hot Knife heats up in seconds and up to 400°C. Then measure and cut 2 pieces of 2×4 to make leg rails. I think around $1? Styrofoam is a very versatile material, used in many hobby applications ranging from remote-control airplanes to home remodeling. If it sounds like "fwubababa" it needs more tension. This is the leg that is on the other side of the H from the handle. Perfect Mini Electric Hot Foam Cutter 3 in 1 Kit - Guritta Hot Wire Styrofoam Cutting Knife, Heated Foam Carving Sculpting Tool, 100-240V Stainless Steel Wire Bowl Cutting Pen Engraver Tips. Insert a ruler or dowel in the tesioning loop and twist it until it seems to be getting a little tight. I actually did wear fairly high quality respirators when working with this type of chemical foam. Have fun DIYing! The hot knife comes in its own case and includes the 8 inch knife, power supply, and how-to DVD for all types of cutting. Use a waxed serrated knife, saw, floral knife or other craft knife to cut Styrofoam sheets and shapes. Use an electric kitchen knife, such as a carving knife or a fish fillet knife, to create clean cuts in Styrofoam. Nice construction, the spring is a great idea. Utility knife. Share it with us! You could use something like a notebook power supply or probably the best bet is a variable voltage bench power supply. Slowly advance the dimmer switch until the wire becomes hot enough to melt the foam. Jan 6, 2018 - Nothing cuts foam like a hotwire cutter! FREE Shipping by Amazon. Use a waxed serrated knife, saw, floral knife or other craft knife to cut Styrofoam sheets and shapes. These are for the box that holds the transformer and dimmer switch, but you would be much better off with something like a "project box" from Radio Shack. Small wood saw 3. Now I like this idea. There's no such thing as an eye hook. Some Projects you can make that use a Hot Wire foam Cutter. 2 years ago Now it was time to fix the table mount connector to the melamine board. Now it was time to prepare the end cap, the end cap will be holding the spring which will stretch the nichrome wire. It was time-consuming, messy, far from accurate, and doing the curves was a real pain. Foam coat and foam glue. Made one, but burned out my transformer? I cut about 60 "Coors Light" cursive letter signs for a contract with this rig and never burned a wire. It can also be use to cut plastic or sy… You can of course bevel edges, etc, with a second pass. The depth of the cut of hot wire foam cutter is limited only by the wire … The 5-1/2 in. HI trickyThe power supply unit I have been using is basically a 12v halogen lighting transformer , these use high frequency (hf) switching to drive a high frequency transformer . 95. The device consists of a thin metal wire, often made of stainless steel or nichrome, or a thicker wire preformed into a desired shape, which is heated via electrical resistance. We'll use two machine screws as terminal posts. blade on this hot knife quickly heats to 975° F to make fast, clean cuts in foam and plastic materials. Also, measure your resistance of the cutting wire. This box was made from 4 cd cases and some packaging tape. The 5-1/2 in. Have I mentioned that you should use a different design for your enclosure? So, the length of the loop when taut should be about the same as the distance between the bolts. Make sure ventillation is very high. The styrofoam hot knife cutter HWS250! To the neophyte, cutting such a soft material would seem to be a simple matter. The other end of 4 " Pipe will be connected to end cap. Hot Wire Foam Cutter, Electric Cutter Styro Foam Polystyrene Cutting Machine Hot Wire Knife Styrofoam Cutting Pen with Electronic Voltage Transformer Adaptor(US Plug 100-240V) 4.3 out of 5 stars 6. on Introduction, Can you please elaborate on what the "hf lighting psu " is I am very interested in building a cutter and any helpfully hints are much appreciated. 11. DIY Doc. Make sure to use a knife that’s convenient for you to hold and maneuver. $57.95 $ 57. FREE Shipping by Amazon. 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