The new Form 20 and Form 30 solid-sink EDM machines from Coventry-based GF Machining Solutions (www.gfms.com) feature integrated, modular, rotary tool changers (RTCs) — with eight to 26 positions — that increase flexibility and allow ‘lights out’ operation.

Managing director Martin Spencer says: “Machining precision components and mould tools that require multi-electrodes presents productivity challenges and can lead to stop/start production. To physically replace electrodes requires manual intervention. This is a cost; it also interrupts machining operations.”

The Form 20 and 30 machines with their in-built automation address these problems, as pre-set electrodes are loaded into the machines’ electrode magazines ready for machining. The Form 20’s magazine has a capacity for eight electrodes with diameters up to 150mm, or 16 electrodes with diameters up to 70mm.

The larger Form 30 can accommodate 13 electrodes up to 150mm in diameter, or 26 electrodes up to 70mm in diameter.

In addition to their RTCs, the machines incorporate iQ technology that is designed to reduce electrode wear at faster machining speeds. This builds a protective layer on the electrodes, maintaining their edges and detail capabilities throughout the entire ‘burn’.

This is especially advantageous for electrodes that produce the same cavity shape a number of times, as it helps manufacturers to reduce the time spent making replacement electrodes.