1. How to use an ER Collet

   ER Collets are often a go-to for machinists because collets are readily available at varying price points and allow a tool holder to hold varying size tools. ER collets also have a greater collapsing range than SK collets. However, there are a few things that aren’t readily apparent to the beginning machinist:

What Is Spindle Runout?

Spindle runout, or tool runout, as it can also be called, is the inaccuracies that cause a tool (in a mill) or workpiece (in a lathe) to spin off the ideal axis. It’s very bad for tool life, so it’s good to know more about it.