Bell Crank

Tue, 28 Sep 2010

The bell crank is used to convert the direction of reciprocating movement. By varying the angle of the crank piece it can be used to change the angle of movement from 1 degree to 180 degrees. The bell crank was originally used in large house to operate the servant’s bell, hence the name.

“Jeeves, where’s my tea?!”

Download and make your own bell crank mechanism here.


There’s an updated animation here:

  To receive new blog posts by email

Comments (10)

  • Anonymous December 8, 2011 at 6:47 pm

    Jeeves, wheres my tea?!

    Jeeves, wheres my tea?!

    • Jeeves April 17, 2012 at 7:11 pm

      on its way sir

      on its way sir

  • Anon June 14, 2012 at 5:07 pm

    Good, Make sure it is EXACTLY

    Good, Make sure it is EXACTLY 87 degrees!!

    • Anonymous July 25, 2012 at 1:54 pm

      Yes, sir, 87 degrees EXACTLY

      Yes, sir, 87 degrees EXACTLY right on the spot, of course sir.

      • Anonymous January 10, 2014 at 6:25 pm

        And make sure to put in only
        And make sure to put in only 1.243 teaspoons of sugar!

  • Anonymous January 13, 2014 at 1:07 pm

    And make sure each grain of

    And make sure each grain of the sugar has been individually sculpted into a microscopic model of Donald Duck sun-bathing on a deck chair. 

    This is getting silly. – RI

    • mohini October 31, 2016 at 12:37 pm

      funny comments can’t stop

      funny comments can’t stop laughing

      • hugh jazz March 22, 2017 at 1:59 pm

        omg neither such class banter

        omg neither such class banter

  • Anonymous January 24, 2014 at 11:11 am

    sir, I assure you it is on
    sir, I assure you it is on its way. Do not panic, I have got you Earl Grey tea for this morning sir with a little biscuit on the side. :{)

    Like I said… – RI

    • Anonymous March 19, 2015 at 9:16 pm

      *Deposits tea with bell

      *Deposits tea with bell crank* Here you are, sir.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.