Marking of block gauges

Abstract

According to this invention, a novel marking method for block gauges employing an improved electron discharge marking approach is provided. The method for marking on the surface of a block gauge, comprising: preparing a block gauge with electric conductivity or partial conductivity; immersing said block gauge in an insulating oil with cooling circulation sufficient to maintain the oil at a temperature; and applying to said block gauge a discharge current and a modulated pulse width to produce recessed markings. In some embodiments of this invention, the temperature is an ambient temperature, the discharge current is between 0.1 to 10 amperes, the modulated pulse width is between 1 to 100 microseconds and preferably between 1 to 20 microseconds, and the surface roughness of the recessed markings is within 10 .mu.m and preferably within 1 .mu.m.

Dependencies are inferred from the claim text.