Collet size and bit shaft diameter

[QCDvacuum (Jeff Cable)]

A heads up for a great machine tool service (UK based)

I bought several items from a UK based supplier of machine tools. I was struck by how helpful this professional service was. All of my pre-sales questions were answered fully. The prices were very keen for high quality Swiss goods. I decided to purchase REGO-FIX because they were the original developers of the ER collet system in 1972. I bought a complete set of ER20 ultra precision collets with a stated Total Indicated Runout of 5 micron (2 x 10,000"). I also bought a castellated collet clampi…