Partridge in a Pear Tree Automata
Build an automata with a back and forth motion using two cams.
- Satay sticks
- Coloured paper
Cut the cardboard pieces to make the frame of the automata. Download measurements.pdf as a guide. Or, if you have your own laser cutter, download the .svg files.
Or, if you have your own laser cutter, download the .svg files and laser away!
Downloads: automata_frame.svg automata_measurements.pdf automata_shaft.svg
Assemble automata frame
(a) Pinch the top of the side pieces so that it becomes more manageable to bend
(b) Slot the flap into the top frame
(c) Do the same for the other side of the frame
(d) Slot in the bottom piece of the automata
- Cardboard pieces
(a) Cut a 4cm piece of the satay stick.
(b) Insert the 4cm-satay stick into the top hole of the cam.
(c) Insert the other end of the satay stick to the bottom hole of the second cam.
- Satay Stick
Assemble cam shaft of the automata
(a) Poke the satay stick through one of the side piece
(b) Insert the cams that we did in step 3.
(c) Poke the satay through the other end of the side piece
(d) Adjust cams to be centralised to automata
- Satay stick
Assemble cam follower
(a) Squeeze a small piece of straw through the top hole. This provides a smooth surface for the satay stick to glide along.
(b) Thread the satay stick through the top
(c) Attach a circular piece of cardboard on the bottom of the satay stick. This is the cam follower.
Test and Improve
(a) Glue the satay sticks to the cams and cam follower.
(b) Test your automata; if it works well, wrap the ends of the cam shaft with scotch tape to prevent it from sliding out.
- Scotch Tape
Decorate your automata with a partridge and a pear tree!
- Partridge and tree cutouts