Have you ever been frustrated by the lack of precision in mini or benchtop mill or lathe? Back in 2007, we ran into the same issue. It started with the Sherline lathe. The stock we needed to cut was too large for the WW collet system and the jaw chuck was useless for our needs. Plus, the spindle bearings were a lower grade than what we needed. Our parts went into superchargers and needed very tight tolerances. The rotating parts could spin up to 200,000 RPM. Some rotating parts operated very close to fixed parts (compressor wheel to be specific). The closer we could operate the rotating parts to the fixed parts without collision, the higher the efficiency of the supercharger. So anyway, we decided to have our own spindle arbors ground to use ER32 collets. The results ended up being amazing! We could turn parts in the .000050″ range. Currently, the best combination for that kind of precision using our adjustable ER nut, ultra-precision collets, ABEC-9 bearings with a secondary grinding operation to the collet mating surface. When others discovered the level of precision we were getting, they wanted us to make the headstocks for them too. And so began GlockCNC.com…