Neistagröftur is a technology invented between the first and second world wars. This technique is based on an electrode that has the shape of each other. Initially, technology was primitive and almost exclusively used because other tools did not work. Over the years, a spark grave has developed very, and today it is possible to control the process very accurately, but the accuracy is 1m. Surface finish (rhythm) is from 0.4 Ra to 20 Ra mine. A spell graph can create a form that is not possible with any other technology. The examples below show a fraction of the possibilities.
