What Is an Arbor Drill Bit Used For?

An arbor is a part of a drill that a drill chuck is fastened to. A drill chuck is used to hold the drill bit in place. It can be screwed onto a threaded arbor, or it can be driven onto a tapered arbor.

About Arbors

Drill arbors are used to hold a drill bit in place.

A drill arbor is a small spindle-shaped shank found on a drill.  It can be a separate small part that is removable from the drill itself or it can be manufactured so that it is already on the end of a drill spindle.

An arbor is removed by placing a chuck into a vise and can be unscrewed.  In some drills the drill chuck is kept mounted directly onto the arbor during use.

Tapered Arbor

A tapered arbor is shaped so that it comes to a taper, or a thin slanted end.  Tapered arbors do not require a key to tighten the chuck to keep them in place.

They are removed with specialized forked wedges used to pry it out.  A Morse taper is located on one end of an arbor, mounted into the socket of a drill press.

The other end of the tapered arbor is short and plain and is called a Jacobs taper. 

Jacobs Taper

The Jacobs Taper end of an arbor is driven into a socket located at the end of a drill chuck.  These are the most common type of taper that is found on a tapered arbor.

About the Author

Alexis Rohlin is a professional writer for various websites. She has produced works for Red Anvil Publishing and was one of the top 10 finalists in the 2007 Midnight Hour Short Story Contest for OnceWritten.com. Rohlin holds a Bachelor of Fine Arts in English from Madonna University.

Photo Credits

  • Electric drill with a drill on a white background image by terex from Fotolia.com