GF Machining Solutions After the sky falls, EDM helps find the beauty at the core

Editor: Eric Culp

Electro-discharge machining can be used for cutting a wide range of materials, but one UK shop was in for quite a surprise when it was asked to machine something that had only recently arrived on this world.

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A look at the interior of the fallen 'star'.
A look at the interior of the fallen 'star'.
(Source: GF Machining Solutions)

Precision subcontractor North Devon Precision Products (NDPP) has been conducting business since 1973, so the shop has seen plenty. But the Barnstaple, UK, company was confronted with an out-of-this-world manufacturing proposition: machining high-precision parts from a meteorite

Shop MD Nick Squire said his company was approached by an agent for Richard Dinan, entrepreneur and co-owner of Armour Surveillance Security Equipment and Technology. The company was looking for local precision manufacturing to make high-quality, high-accuracy components for a limited range of stylish and sophisticated micro-keyless entry system bracelets.

A true blast from the past

“What was particularly exciting about the project,” Squire noted, “was that the raw material used to machine the components was to be a four-billion-year-old meteorite!”

The meteorite (known as a Gibeon meteorite) is composed of an iron-nickel alloy with significant amounts of cobalt and phosphorus. The crystal structure provides a classic example of fine octahedrite and the Widmanstätten pattern exhibited after machining, chemical etching and polishing the material is renowned for its beauty, the reason for its use in high-value jewellery.

Owing to the non-contact and stress-free characteristics of EDM, the shop determined it was the best process. However, NDPP was aware that this method could create a potential problem down the line. Because the composition of the meteorite was unknown, EDM could have failed.

“We were machining blind and didn’t know if we would hit a pocket of non-conductive material, which would render the EDM process redundant,” Squire noted. The shop created sophisticated jigs and fixtures to hold the meteorite with the hope operators could index the meteorite around if they hit a non-conductive area.

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