The Easy Clock Mechanism




About: Hello. I'm JonnyBGood! I'm a college student who now has a degree in Mechanical Engineer Technology. (MET) (excessively worded to mean a person who builds stuff).I enjoy building K'nex guns and many other th...
I designed this for demonstrating how a pendulum works in a clock. It's speed can be adjusted by how much weight is on the pendulum. I actually built this to be a timing device but I doesen't last long enough for what I need it for. Anyway I would definitly use it to show off to a science or engineering class the basics of a clocks internal working through mechanical motion. The video above shows how to use it.

Step 1: Body Step 1

Step 2: Body Step 2

Step 3: Body Step 3

Step 4: Body Part 4

Prettry straight forward just build what you see in the pictures. After this step you are done building the body!

Step 5: The Gear

Very important part and also an easy assembly. Make sure that the gray connectors are as shown in the picture with the holes faceing up.

Step 6: The Pendulum Top

Again very important piece.Make sure to put the blue rods on as shown. Broken blue connectors are not required.

Step 7: Bottom Pendulum

Step 8: Motor Assembly

Now the wind up motor is important make sure to pay attention to the orientation of the arrow on the top of the engine.

Step 9: Assembling the Pieces Step 1

Just follow the photos adding the pieces as you go.

Step 10: Assembling the Pieces Step 2

The top pendulum piece must be put on top of the gear and than the axle can go through it.

Step 11: Finished

Congradulations! You are done! If you end up using it drop me a comment so I can thank you.



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    22 Discussions


    3 years ago

    how many/what type of wheels make it a 1 second timer


    3 years ago

    Very nice! Where do you get all the parts to build it? does it come in a kit or part of a kit? Thanks!

    1 reply

    Reply 3 years ago

    No parts kit. This is a custom design I put together to demonstrate a pendulum clock.
    As long as you have a spring motor you should be able to make it.


    Reply 5 years ago on Introduction

    Thank! Please do build this. It is really fun to play with and mod. I use it as a timer and a larger weight powered version for a metronome.


    6 years ago on Introduction

    thank you sooooo much i just happen to be doing a project for my pricibles of technology class and it something that moves made of knex
    i am totally using it

    1 reply

    Yep. Youtube has a lot of precise knex clocks, but they are really complex. This just came about trying to simplify it.


    Another cool thing about this thing is I am using it as a timing device on my next instructable. It just has a three foot tall weight drop tower attached to it and a gear ratio. Well at least the prototype does so far.. it only runs for 18 minutes and I need an hour.


    Reply 6 years ago on Introduction

    Never mind. I did make it. It was a automatic cat feeding device.... but when I tried it out, my cat decided he didn't want to eat for the next few days!!!!! We took him to the vet and they didn't know what was wrong. He's fine now but I destroyed the device. If you want to make it I'll tell you how it worked.

    Is there a way that can work without a wind up motor, i still want to make it a wind up though, but i dont have one of those wind up motors and i want to build this. btw good job!

    4 replies

    Of course! Just use a weight power!
    1.Extend the axle with the gear attached.
    2. Then wrap some string around the axle.
    3. Attach a weight to the end of the string hanging off the axle.( I use a one or two large knex tires for the weight.)
    4. As the weight drops the clock mechanism should work, if not, try winding the string the other way.

    That should equal the same result as the wind up motor except this can run longer depending on the height the weight has to drop .

    If you still are having problems just ask. =)