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Hi Moto,
You asked about Fanuc machines, but a small back-story first. “Core-Stitch” is patented and trademarked by Seibu of Japan, but is presently licensed for use by Fanuc EDM and is available on these machines also. Here is an excerpt about Seibu's "Core-Stitch" feature from my article on "Slug Management". It's not much, but it's what I was given.
View attachment 223698
Every WEDM’er knows that when certain system conditions allow it (when the DI water conditions and carbide contacts are bad), you will encounter what is called “brassing”. This is when a small amount of brass from the EDM wire plates onto the freshly cut surface. In Seibu’s “Core-Stitch”, these conditions have been manipulated to exaggerate the "brassing" condition to completely bridge the upper region of the wire gap with brass (see phantom side view).
I am aware of at least two other Japanese OEMs who also have this “stitching” capability (including trademarks), but they are not advertised or sold because of existing patent issues. I would suspect the European builders also have something like this.
Check both Seibu's and Fanuc's literature and web-sites for more info.
Bud Guitrau
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