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Made from Nickel Chromium wire and with normal use will last many years. For heavy strokes and filing large areas 23SWG (0.61mm).
Heavy coils give a wide burn and fill large areas quickly.
Coils are made from strong stiff nichrome wire and are available in a variety of widths from 3 to 8mm. They will burn a wide line or can be used to shade large areas. With light pressure and a rotary movement over the wood they can be used to give a large uniform shaded area. they are even powerful enough to burn without contact to give a soft shading effect.
See the following description and the additional photos to see an example of how this coil is used to create some large numbers for a house sign.
First produce a mirror image of the number on your PC and print it out to a suitable size. Use a laser printer or a photocopier of the old fashioned sort which uses a powder toner.
The printout is taped face down on the wood taking care to position it correctly.
Re-melt the toner onto the wood
Use a hot iron and rub thoroughly all over the surface of the back of the image. The black toner will transfer a faint impression of the original. You might have to rub quite hard. The toner may stick the paper to the wood but it is easy to pick it off.
Try to printout the image as dark as you can to get the best transfer of toner.
Notice here I have bent the point sideways to make it easier to get an even line.
The coil produces a striped texture. If you want to avoid this the coils can be ground down a little to a more even surface. It is OK to file or grind or modify the coil so long as you do not weaken it unduly.