Bird and Worm : Ratchet based model.

Thu, 12 May 2011

I have a few ideas for projects using ratchet mechanisms. First up, this as-yet unnamed bird and worm model. I'm planning to use a four or five toothed ratchet. Pull the tab on the front of the model and the bird will pull the worm further and further out of the ground before snapping back down again.  

 

After a frustrating afternoon struggling with a clogged printer, here is the first draft. A fair way to go yet, but the good news is that I've started. Often the longest part of any project is the part where I'm gazing vacantly into space trying to work out what I'm going to do and how I'll do it. That stage is done. Now for the easy bit 🙂

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Comments (12)

  • frankenpaper May 12, 2011 at 6:38 pm

    Absolutely Brilliant mode

    Absolutely Brilliant mode idea l!!!

    BY the way, I do that blank stare thing all the time. But somehow you get much more productivity out yours than I do out of mine. 

    I am just thinking out loud here, but what if your trimmed one of the teeth off of the ratchet. I don't mean have 3 teeth equally spaced, I mean to leave them in place but just trim one off. Then you would have 2 short strokes and one long, to add additional interest to the pattern of motion. It's just a thought. 

    Maybe the difference is that you do a vacant gaze and I do a blank stare. What ever it is, it's working for you. Keep it up!

  • Nobledesign May 12, 2011 at 6:56 pm

    Brilliant, Rob!! So exciting

    Brilliant, Rob!! So exciting to see you work up a model. For you, the easy part is the world's impossible part.

  • frankenpaper May 12, 2011 at 7:55 pm

    This is what I had in mind

    This is what I had in mind for the ratchet.

    • robives May 12, 2011 at 8:03 pm

      Nice idea with the ratchet –

      Nice idea with the ratchet – I'll give it a go.
      Also – thanks Shelley 🙂
       

      • daveyboy May 13, 2011 at 3:36 pm

        Is this a re-incarnation of

        Is this a re-incarnation of the "Early Bird" wooden model prototype from a number of years ago ?

        • robives May 13, 2011 at 8:20 pm

          >> Is this a re-incarnation

          >> Is this a re-incarnation of the "Early Bird"

          With a few variations and a different mechanism, yes. And I'll probably use the name. Wooden Early Bird, that was a while ago, well remembered!

          —-

          The original model was mode from plywood and was named the 'Late Bird'. In that model the worm came out of the ground then the bird pecked just as the worm popped back down to safety.  

          • Smelter May 19, 2011 at 2:05 pm

            Have you pulled apart a

            Have you pulled apart a retractable ball point pen recently?
            There is a ratchet on the end of a cylinder that pushes the nib in and out!

          • robives May 19, 2011 at 6:41 pm

            The pen I have here has a

            The pen I have here has a sort of crown ratchet, it has six teeth but on two states. I feel an animation coming on.

          • Shelley Noble May 19, 2011 at 7:03 pm

            Woo hoo! INSPIRATION!!! Can’t

            Woo hoo! INSPIRATION!!! Can't wait!

          • Smelter May 22, 2011 at 9:36 am

            Go for it Rob.
            Who knows

            Go for it Rob.

            Who knows where this mechanism could take us.

          • frankenpaper May 22, 2011 at 3:59 pm

            I would love to see how a

            I would love to see how a crown ratchet works!

          • Smelter May 25, 2011 at 6:13 pm

            Hi Frankenpaper
            Here are a

            Hi Frankenpaper

            Here are a few items of interest to tie you over while Rob is busy :-

             

            Capstan Ratchets…..

             

            http://www.flickr.com/photos/[email protected]/5395789696/

            http://www.stvincent.ac.uk/Heritage/Warrior/anchor.html

            http://www.ehow.com/list_7556583_circular-devices-ratchets-pawls.html


             

            http://youtu.be/dr2Iyc5Vk7o

            http://youtu.be/UERhFH0XVns

             

            Here is a really neat right angle socket wrench.

            http://youtu.be/fz1rmuaZZOM

            And here its turned into an "Elbow Engine".

            http://youtu.be/5ZRKNlY7enM

             

             

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