Patent ID: 9239307
Filing Date: 2016-01-19
CPC Classification: B23H,B23K,F16C,G01N

Claim Text:
1. A method of electrical discharge machining (“EDM”) a polycrystalline diamond element, the method comprising: providing the polycrystalline diamond element that includes a polycrystalline diamond (“PCD”) body, the PCD body including a PCD table, at least a portion of the polycrystalline diamond body exhibiting a coercivity of about 115 Oe or more and a metal-solvent catalyst content of less than about 7.5% by weight; measuring an electrical resistance between a plurality of locations of the PCD body with an electrical impedance tomography system; calculating a plurality of electrical conductivities of the PCD table at least partially based on the measured electrical resistances; and EDM the PCD body only if the plurality of electrical conductivities of the PCD table are above a threshold value.