Bell Crank

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:


Thursday 8th Dec 2011 18:47

Jeeves, wheres my tea?!

Tuesday 17th Apr 2012 19:11


on its way sir

Thursday 14th Jun 2012 17:07


Good, Make sure it is EXACTLY 87 degrees!!

Wednesday 25th Jul 2012 13:54

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

Friday 10th Jan 2014 18:25

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

Monday 13th Jan 2014 13:07

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

Friday 24th Jan 2014 11:11

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

Thursday 19th Mar 2015 21:16

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