How to make a nickel-chromium fret-saw cutter

Hello my dear friends! Today I’m going to show you in this video how you can make a nickel-chromium cutter with your own hands.


First, we need to manufacture two wooden handles, in my case there are two pieces of a branch, then we need two long nails or two pieces of a firm wire, about a meter or one meter and half of a copper wire and also a nickel-chromium wire with the section of 0,4 – 0,8 mm, you may buy it in the market or in heaters or boilers shop. Otherwise you may take to pieces a wire resistor or a water boiler, as it has a nickel-chromium fiber. The main thing is a power supply unit, we are going to use a computer power supply unit, as that is the most effective and cheap variant. It costs from 8 dollars and higher in the shops. In the markets you may find the power supply units from old unnecessary PC with Pentium-2 and Pentium-3 for 2 or 3 dollars.


Let’s start assembling of our device. First, we need to prepare wooden handles. We beat the nail through or thread a firm wire inside. If a wood is soft, it won’t be hard, but if it is firm, you better drill a hole through beforehand. Then we take round-nose pliers and bend four rings to prevent wires from slipping off while twisting.


Let’s move to the power supply unit, chose any yellow and black wire, cut off with the nippers, connect to the main wire and isolate it properly with the friction tape or thermosetting.

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. We get 12 volt and about 8-10 ampere. To be more sure you may look at the table on the power supply unit or measure it with the tester. Also, pay attention to the fact that power supply unit won’t work after plugging into a socket. You may install a switch on old models, connecting the green wire with the yellow or black one. For a new power supply unit you may make a switch much easier, you need to shorten these two wires with a clip for a split second.


Well, the most important moment has arrived, we need to choose a correct length of the nickel-chromium wire. There’s a formula for estimation of the correct length and section of the wire, or it may be done by a rule of a thumb. We connect plus to one end of a nickel-chromium wire and approach with the minus from another end, till the wire starts becoming red. Otherwise you take a risk to overload a power supply unit which may result in its break or the nickel-chromium wire will overheat and tear all the time.


Then we bite the wire with the nippers from this place and bind to the rings of the wooden handles. Note, that polarity doesn’t matter in this case.


That’s all, a nickel-chromium cutter is ready, as you can see, the box is small and doesn’t occupy much space, it may even be portable. If you want, you may remove all the unnecessary wires, not to confuse you and set a small switch. With the help of such a cutter you will be able to cut out very beautiful frames, cut foam plastic evenly and make many nice and interesting things with this cutter. I’d like to suggest you not to use too thick nickel-chromium wire, because it overloads the power supply unit too much. That’s all for now. Thank you so much for your attention! I,m going to make a test on a wooden brick. Bye-bye everyone!

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