Rack and Pinion 101

A rack and pinion is a device which converts rotational motion into linear motion. A circular gear called "the pinion" engages teeth on a linear "gear" bar called "the rack". As the pinion rotates it causes the rack to move relative to it, thereby translating the rotational motion of the pinion into linear motion of the rack.

As woodworkers we will be most familiar with their use in machinery, however they are widely used in other industries as well, automotive steering, pneumatic actuators, and railways.

Rack railways are particularily interesting as they are used to help a train up a steep incline but just importantly as a brake on decent.

Uses

Arbor Press

Probably the best example to illustrate a rack and pinion is an arbor press.

 

Drill Press

A rack and pinion is utilized in the mechanisms that raise and lower the chuck and often the table as well.

drill head

In this case the rack is a cylinder with the teeth milled into it.

Drill Press rack and pinion

Here the rack is exposed.

Metal Lathe

metal Lathe

When the handle "d" is rotated a pinion moves the carriage by engaging in the rack "K".

 


Colt "Peacemaker" 1875


Frame for Illustration Only

This page sponsored by:

Patent Print Art

Introducing "Combined Prints"
We are using the first page of the written description as a base printed in lighter type to include assignor information on select patent drawings.

Large 25 X 33 cm prints fit in a 10" X 13" frame

Available from: PatentPrintArt.com

 

hit
counter