Rack and Pinion

Thu, 30 Sep 2010

The rack and pinion is used to convert between rotary and linear motion. The rack is the flat, toothed part, the pinion is the gear. Rack and pinion can convert from rotary to linear of from linear to rotary.

The diameter of the gear determines the speed that the rack moves as the pinion turns. Rack and pinions are commonly used in the steering system of cars to convert the rotary motion of the steering wheel to the side to side motion in the wheels.
Rack and pinion gears give a positive motion especially compared to the friction drive of a wheel in tarmac. In the rack and pinion railway a central rack between the two rails engages with a pinion on the engine allowing the train to be pulled up very steep slopes.
Download and make your own Rack and Pinion model in the shop
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Comments (11)

  • Anonymous June 19, 2011 at 2:37 pm

    Just wanted to say that this

    Just wanted to say that this site is fantastic!

    • Anonymous June 23, 2011 at 2:23 am

      Linear motion transfered to

      Linear motion transfered to rotary motion does turn me on.

  • Anonymous November 5, 2011 at 7:07 pm

    i love this website, great

    i love this website, great work 

  • Anonymous November 25, 2011 at 4:39 pm

    what is the use of it can you

    what is the use of it can you tell.

    • robives November 27, 2011 at 10:05 am

      Rack and pinion drives are

      Rack and pinion drives are used in car steering. The turning action of the steering wheel is converted into a side to side action on the wheels being steered

  • Anonymous January 17, 2012 at 2:41 pm

    nice website

    nice website

  • michael42er January 25, 2012 at 3:07 pm

    For the model “Rack & Pinion”

    For the model "Rack & Pinion" there is little scope for applying a different model. The slider model from the "Mechanical Gentleman" is suitable.
    There are some small adjustments necessary:
    The pinion to reduce the diameter from 10 to 8 teeth.
    The underside of the slider is turned up, so that the cam is slightly lower.
    The rack of the slider extended.
    The lower body is usually glued directly to the base. In the video for demonstration only placed separately.
    About sense or nonsense is debatable known. It gave me just a joy to vary with the models.

    A short video clip on Youtube: http://www.youtube.com/watch?v=9ctCOp8Z5vY


  • m.hengsbach January 25, 2012 at 3:34 pm

    Here are some photos of the

    Here are some photos of the model. After a tip from "Chuck" I've given him back his left arm.



  • Anonymous March 28, 2012 at 6:21 pm

    Awesome helped me so much

    Awesome helped me so much with gcse systems project at BASSALEG!!!!

    • Anonymous April 30, 2015 at 10:12 am



  • Ben Lister May 21, 2018 at 11:43 am

    Awesome site

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