[Raynerd] wanted a new spindle for his CNC machine and thought that a brushless ... A collet is a device used to hold cutting tools by collapsing a segmented ring around the tool.

Here is an example of a CNC milling machine cutting a face out of metal: Video Credit: Glacern Milling Tools / CC BY 3.0 Early CNC machining processes took time to program and were best used only in ...