- May 11, 2021
Good morning everyone! I have some smallish, cylindrical parts...1" long x 0.9" diameter. They have a series of blind holes, 2.5mm and 3.0mm diameter (not overly critical) x 0.850" deep. The base material is a diamond reinforced ceramic composite....ridiculously hard and tough stuff. In some parts, there is residual silicon metal in the holes; I am looking for a fast economical way to remove the silicon. My thoughts thus far: hole pop EDM...due to the lack of conductivity of the base material, not the best option. Second; use a drill press and a PCD tool....because the silicon isn't flat or even, it wants to grab and break the tool. Third, I thought of a small diamond grinding nib...it works, but it is slow. Lastly, I thought of something like an air gun with a needle tip, and somehow introduce an abrasive media...just like a waterjet machine, but hand held...or something like a coolant inducer for the old style core drills....does anyone have any ideas?