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The Geneva Stop is a mechanism used to create intermittent motion. The classic example of the Geneva Stop in action is the film projector. In the projector, the film needs to be advanced one frame at a time then held still as the projector light is shone through it. The Geneva Stop fulfills this need perfectly

Inspired by the work of Michael Hengsbach from Berlin I present here is a working paper model of the Geneva Stop. Members can download the parts for free, non-members can download for a small fee.

Print the parts out onto thin card (230 micron / 230 gsm) Score along the dotted lines and cut out any holes. Circular holes are marked with a red cross at the centre so that you can use a circle cutter. 

Carefully cut out all the pieces.

The completed project.


Fold up the tabs on the bottom and top to make two triangular section tubes. These will make make the box sides more rigid.


Glue the stiffeners to the drive wheel sides and fold round the tabs to make triangular section tubes.


Roll up the pin piece as tight as you can then glue is down.


Glue together the two axle to make square section tubes.


Thread the drive wheel sides onto the longer of the two axles lining them up with the two grey lines.


Starting from one end, glue the drive wheel edge into place a few tabs at a time.


Expand the cross holes at the end of the drive wheel with the point of a pencil then slide the pin into place. Fix it into place with a dot of glue.


Fold the two halves of the cross back to back and glue them together to make double thickness card. When the glue is completely dry cut round the parts with scissors, ignoring the slots for now.


Cut out the slots with a sharp knife.


Thread the cross onto the shorter of the two axles lining it up with the grey line.


Make up the handle in three steps. Fold the two square sections round and glue them. Fold the two halves, one into the other and glue. Roll round the long tab and glue it down to complete the handle.


Glue together the two halves of the box but don't close it yet.


Fit the drive wheel and cross into place. The drive wheel fits into the hole closest to the centre.


Fold the box round and glue it shut. Glue the flaps into place, top and bottom making sure that the box remains square. Glue the washers into place on the grey areas marked.


Complete the model by gluing the handle to the drive wheel axle. 


Turn the handle and the drive wheel engages with the cross   turning it quarter of a turn at a time. Use this project to explore how the Geneva Stop mechanism works or as the starting point for your own design. 


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Comments

Monday 22nd Aug 2011 11:03

umehta

I still have to download and make it but it looks perfect.

Not sure if it will engage the ratchet teeth of the early bird without any more modification to the height or opening of the side of the box...

...but can't say until I build one myself.

Monday 22nd Aug 2011 11:52

m.hengsbach

m.hengsbach's picture

Rob,

I’m amazed at how you have a short time the idea on paper and have published to rebuild. Very good solution is to attach the pins on the two drive wheels. This gives more stability. I hope that many interested.

Michael

Monday 22nd Aug 2011 12:23

robives

robives's picture

Thanks for the inspiration Michael!

Sunday 11th Sep 2011 10:08

michael42er

michael42er's picture

For those interrested paper model builder, have the desire to try. I present two versions for the connection from the “Geneva Stop” with a model. If the model is already completed, you only need a pedestal to the heights of the axles to match. Are the side panels are not cut out and not  glued to the hole for the axis of the star wheel is moved. In both variants is still a connecting piece, approximately 7x7mm, 40mm long needed. A short video clip on Youtube to this.:

http://www.youtube.com/watch?v=R9IwJ4cHU20             http://www.youtube.com/watch?v=R9IwJ4cHU20

Another note, in all my models, I glue a second layer paper on the axle box.

Michael alias  michael42er



Sunday 11th Sep 2011 10:54

robives

robives's picture

Thanks Michael, that's amazing! I've written a quick blog post about your mod here.

Monday 23rd Jan 2012 14:53

Blakymcblack

That is amazing! Using your mechanisms, would it be possible to create a vitascope?