Before wire erosion, toolmakers would have to file out shapes and radii by hand.
There are various manufacturers of these machines. One of the best know in the industry is Agie/Charmilles and Sodick. Other manufacturers are Eurospark andOna.
The process involves an electrically charged brass wire that uses the electricity to cut through solid steel blocks. The wire doesn't actually touch the steel, the electricity itself does the work. The processThe reason press toolmakers use wire erosion machines is because they can cut solid steel to very tight tolerances whilst still maintaining an excellent surface finish.
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