£2.50
Download Worm Gear / Cam
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Turn the handle on the Worm Gear / Cam box and the gear inside advances one turn for each turn of the handle, a speed reduction of 12:1. Inside the box is a snail cam and cam follower which slowly lift as the gear turns and then suddenly drop at the end of the twelve turn cycle.

Use the Worm Gear / Cam as an interesting exercise in pure mechanism or as the starting point for your own character based paper automata.


Members can download this model for free at the link. Thanks for signing up! Non-members can download the project file for £2.50.

Print out the parts onto three sheets of thin card. 230gsm / 67lb is ideal. I have printed the parts onto coloured card to make a colourful model.

Score along all the dotted and dashes line and cut out the cross-hatched holes before carefully cutting out the model.

 


Fold over the gear to make double thickness card then card carefully cut it out.


Fold over the cam to make double thickness card as well. Once the glue is dry carefully cut it out.


Roll up the three tubes and glue them down lining up the ends with the points of the arrows.


Thread the gear and the snail cam onto the square shaft lining them up with the grey lines. Make sure the cam is the correct way round.


Assemble the cam follower.


Glue on the tab...


...then the short section of tube.


Roll the tab round and glue it into position between the two triangular tubes.


Take a penny piece (20mm diameter 4gram weight) Wrap an off-cut of card tightly round the coin and glue it down. Glue the coin to the cam follower just behind the tube.


Fit the wider tube into the worm axle Line it up with the grey lines.


Start at one end of the spiral grey line, glue a section of worm to the shaft. Try and keep it as perpendicular to the shaft as possible.


Glue the next one in place overlapping the first by one face width of the hexagon tube.


Work your way down the tube in the same way gluing each piece down with a full face overlap.

Once complete glue the five pieces of worm gear together.


Assemble the handle in three steps.


Fold up and glue the triangle tubes on the box ends.


Fold up and glue the right angle triangles on the box top and base.


Glue the sides to the top as shown.


Thread the gear into position and glue in the base. The gear should turn freely in the box holes. If it does not, remove the shaft and expand the holes very gently with a pencil.


Glue in the two box side stiffeners next to the cam shaft but not so close that they stop it turning.


Fit the worm gear into position.


Close the box front locating the worm shaft into position. Glue the handle to the shaft.


Glue the end of the push rod to the cam follower.


From the back of the box, thread the push rod up through the hole in the box top then glue the cam follower to the back of the box. Once the glue is dry turn the handle and the cam will inch round incredibly slowly.


Perfect for making a tortoise that peeps out of her shell? Or a snail creep along or perhaps a sloth in a tree?

Whatever you create with this useful mechanism be sure to share photographs with the rest of the website visitors by emailing them in!


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£2.50
Download Running Dog
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Running Dog. Turn the handle and see the dog run powered via the mesh gears and crank mechanism

Watch the running dog in action in this YouTube video!

The running dog is based on the Mesh Gear / Crank mkii Essential Mechanism. All the parts, including the Mesh Gear Crank are included in the Running Dog file. Members can download the parts file for free at the link, non members can join in the fun for £2.50

Download and print out the parts onto thin card. (230 gsm / 67lb is about right) Score along the dotted lines and cut out the holes before carefully cutting out the parts.

You will need to construct the Mesh Gear / Crank first, instructions are here.


Once you have completed the box it is time to construct the dog.

Start by assembling the neck and body then gluing them together as shown.


Glue the leg supports into the body with the front piece to the front and the back piece to the back. Make sure that the glued section is upright.


Assemble the stand and glue it into the body.


Fold up and glue down the two linkage pieces as shown so that the short section is made from double thickness card.


Glue the linkages to the leg supports so that they just clear the stand piece.


Make up the four legs by folding them over to make double thickness card then cutting them out. Make the paws in the same way and glue them to the tabs on the ends of the legs.


Assemble the head and ears.


Make up the tail from double thickness card and glue it to the back of the body


Glue the legs to the small tabs on the leg support (arrowed)

Line up the leg so that the centre top of the leg is over the hinge in the leg support. (dotted cross)


Repeat the same process with the front legs.

When you pull the linkages the legs should move up and down freely.


Glue the head to the neck.


Glue on the eyes and nose.


Fit the dog to the top of the main drive shaft gluing it into position .

Glue the two linkages to the top of the box to complete the model.


Turn the handle to see Spot run!


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£1.99
Download Shark Attack
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Shark Attack!

A pop up shark card for you to download and make! Members can download the parts from the link for free, thanks for signing up!

Follow the instructions below and soon you'll have your very own pop up Shark Attack card!

Print out the two parts sheets onto thin card. (230 gsm /67lb) Notice that the second sheet is printed on the front and back. Print out the front, flip the card and return it to the printer then print out the back. Once the ink is completely dry score along all the dotted and dashed lines then carefully cut out the parts.


Fold up and glue the head upper piece.


Glue the teeth to the inside of the mouth.


Glue the teeth to the inside of the lower jaw.


Glue the tongue to the grey area on the back board.


Glue the head and lower jaw into place. Close the card before the glue is fully dry to make sure that all the parts are lined up.


Glue the two fins to grey areas next to the head. Give them a slight curl to lift them from the backboard.


Finish the card by gluing the two eyes into position.


Open the card to reveal the terrifying shark within!


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£2.50
Download Poseable Dog
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A Poseable Dog to download, print-out ad make. This delightful canine has movable legs, head and tail, the perfect desktop companion who never needs you to take him for a walk!

The parts file is available for members to download for free at the link. Non-members can join in the fun for £2.50.

Print out the parts sheet onto thin card (230gsm / 67lb). Score along the dotted and dashed lines and cut out the holes before carefully cutting out the pieces.

 

 


The tail, legs and paws are all made from double thickness card. Fold over the pieces and glue them down. Make sure that the small tabs on the legs are lifted up and not glued.

 


Once the glue is dry carefully cut out the pieces.

 


Thread the tabbed tail piece through the hole in the tail and fold the tabs flat on the other side.

Glue the cover to the tabs on the other side of the tail. Make sure you don't get any glue on the tail itself, these circular pieces must be free to turn inside the tail hole.

 


Glue the second tail cover into place on the back of the tail then glue the two creased pieces to the two covers so that they are lined up with each other.

 


Assemble the body as shown.

 


Thread the tail out of the body from the inside then glue the two semi-circular tabs to the inside of the body so that the top of the circle lines up with the crease line in the body.

 


Glue the wide paws to the front legs...

 


...and the narrow paws to the rear legs.

 


Glue the neck into place in the body, use the grey areas for alignment.

 


Thread the leg tabs into place through the holes in the body and fix them into place with a couple of small dots of glue on the tabs glued to the 'L' cover circles. The legs should be free to move.

 


Fit the rest of the legs in the same way.

 


Fit the head covers into place as shown.

 


Glue the body front into position.

 


Assemble the head.

 


Glue the head to the head cover circles. The head should be free to nod up and down once the glue is dry.

 


Glue on the eyes.

 


Laminate the two layers of the ears together curving them into shape before the glue dries.

Once the glue is dry cut out the ears.

 


Glue the two ears to the head as shown.

 


Once the glue is dry your new best friend is complete! Woof!


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£2.50
Download Rise of the Mammals
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Rise of the Mammals.

Turn the handle and the slightly scared mouse holds her ground in the face of the blue dinosaur! The mechanism is powered by a combination of two stage gear box for the dinosaur and cam to drive the mouse.


You can see the completed smodel in animated action of this YouTube video.

Members can download the parts for free at the link. Thanks for signing up! Non-members can join in the fun for £2.50.

Print out the parts onto thin card (230gsm /67lb)

Score along the dotted and dashed lines and cut out the various holes before carefully cutting out the parts.

 


The gears are made up from double thickness card. Fold them over and glue them down. Once the glue is dry carefully cut them out.


Roll up the various tubes carefully lining up their ends with the arrow points and gluing them into place.


Make up the two crank pieces.


Fit one of the crank pieces into the large gear with the off-centre square hole. The short end of the crank goes through the hole.


Make up the push rod ends from double thickness card. Once the glue is dry carefully cut them out.


Thread the longer of the three crank tubes through the two push rod ends. Glue the push rod ends to the push rod.


Assemble the crank unit as shown.

Fit the two shorter crank tubes into the ends of the crank pieces. (Not shown on this picture)


Fit the small gear to the grey line on the long square tube and thread the long axle into place as shown. Use a dab of glue to stop the tube rotating.


Glue the two cam pieces to the axle.


Assemble the box top and bottom as shown - the side pieces are right angled triangles.


Fit the centre piece into the hole in the box base.


Glue the tabbed small gear to the end of the link tube.


Thread the axle through the centre piece and glue the large gear to the link tube.


Take the two box end pieces. Fold the tabs round and glue them down to make triangular tubes.

Fit the box end to the base. Fit the axle into place as shown.


Fold up and glue the box end into place as shown.


Repeat the process at the other end with the other box end and the crank assembly.


Fit the box top into place threading the push rod up through the hole.


Assemble the handle in three steps.


Fit the handle to the box. Once the glue is dry you can test the mechanism to make sure it it s working properly.


Make up the rear legs and feet as shown.


Glue the feet to the grey areas on the box top.


Assemble the body inner as shown.


Glue the body inner to the body top between the two small arrows on the body top.


Glue the side pieces to the top.

Line the tabs up next to each other.


Finish gluing the tabs together along the length of the body.


Glue the body inner to the inside of the body lining it up with the top of the cut outs in the body sides.


Glue the neck push rod to the link piece.

Glue the link piece to the moving part of the body inner as shown.


Glue the other end of the push rod to the head tab.


Glue the two leg pads into place.


Glue the body front onto place.


Glue the head to the head tab.

Glue the arms into place.


Assemble the mouse as shown.


Fold over the body stand and glue it down.

Glue the tabs to the inside of the mouse body.


Thread the mouse stand down through the hole in the box then roll round and glue down the piece to make the cam follower end.


Glue the dinosaur front to the push rod end.


Glue the leg pads to the inside of the legs.


Turn the handle to bring the past to life!


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£2.50
Download Intermittent Gear
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Here's a quick experimental mechanism for you to download and make. Both gears in the model have ten teeth. The larger gear started as a seventeen tooth gear then had seven consecutive teeth removed. Turn the handle and the smaller gear is turned a full rotation then pauses as the blank part of the large gear moves past. This motion is repeated as the gear is turned.

The model makes an interesting mechanism in its own right but could also be used in a character based model.


As always, members can download the models for free from the link. Non-members can download the parts for £2.50.

Print out the parts onto two sheets of thin card - 230gsm / 67lb is about right. Use coloured card for a colourful model!


The gears are made from double thickness card. Fold them over and glue them down.


Once the glue is dry carefully cut out the parts.


Fit the long square axle into the small gear lining it up with the grey line.

Roll up the two axle tubes and glue them down lining up the ends with the edge of the grey area.

Fit the shorter round axle into place in the square tube.


Fit the short square axle into the large gear lining up the gear with the grey line.


Assemble the handle in three steps as shown.


Glue the long round tube into the handle.


Fold round and glue down the tabs on the box ends.


Assemble the box base as shown and glue the box ends into place on the tabs as shown.


Thread the handle and axle through the box base. Glue the large gear to the axle. The handle should be free to turn.


Fit the small gear into the hole in the top of the box base as shown.


Fit the box top into place over the end of the round axle.


Fold up the box sides and glue them into place.


Fold in the box end sides and glue them down to complete the model.


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£2.50
Download Two Stage Gear
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Essential Mechanisms

A two stage gear with crank output. Turn the handle on the side of the box and the crank turns slowly. The gear box works in two stages at each stage a nine tooth gear drives a seventeen tooth gear. The output stage is driven at 1/3.57th the speed of the drive handle.


Members can download the parts for free at the link. Thanks for signing up!

Print out the parts onto four sheets of thin card. (230 gsm / 67lb) I've used pre-coloured card to make a colourful model.

Score along all the dotted and dashed lines and cut out the holes before carefully cutting out the parts.


The gears are all made from double thickness card. Fold them in half and glue them down. Once the glue is dry carefully cut them out.


Roll up and glue down the five tube sections. Line up the end of the tube with point of the arrow heads on the tube sides.


Assemble the two crank pieces as shown.


Find the large gear with the offset square hole. Fit the crank piece into place gluing it to the grey area. The short end of the crank goes through the hole.


Make up the two push rod ends from double thickness card. Once the glue is dry carefully them out.

Thread the longer of the three crank tubes through the push rod ends. Assemble the push rod tube then glue the push ends into place on the grey areas.


Fit the crank pieces to the push rod tube then glue the other two axle tubes into the open ends of the crank pieces as shwon in the picture.


Assemble the three parts of the drive gear as shown.


Glue together the box base and box top - the edges are right-angle triangles.


Glue the centre piece into place in the box base. (The one with only one hole)

Glue two tabs onto one side of the base and the other two onto the other side.


Fit the second small gear to the link tube as shown lining up the edge of the tab with the end of the tube.


Thread the link tube through the hole in the centre piece with the small gear closest to the centre of the box base. Glue the second large gear to the link tube. Make sure that the gears are free to turn.


Fold in the various tabs on both of the box-end pieces to make triangular tubes.

Glue the box end without the side cut-outs to the tab on the base nearest the large gear.


Thread the drive gear into place in the box-end then fold up the box end and glue it to the base.


Repeat the same process with the other box-end, don't glue the sides down yet.


Fit the box top into place. Make sure the centre piece is glued into place in the hole in the box top.

Glue the ends to the top then glue the sides into place to complete the box.


Assemble the handle in three stages as shown.

 


Complete the model by gluing the handle to the drive shaft.


Once the glue is dry, turn the handle and marvel as the gears mesh together driving the crank!

Use this model as an exercise in pure mechanism or as the starting point for your own character based models


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£2.50
Download Flying Santa
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Just in time for Christmas! Turn the handle on the Flying Santa and his arms flap as he bobs and swoops through the frosty winter air. Three flaps for each bob. Ho ho ho!

Members can download the parts for this model for free at the link. Thanks for signing up! Non-members can join in the fun for £2.50.


Print the parts out onto thin card. 230 gsm / 67lb. The coloured version of the kit is printed on both sides of the sheet. Print one side, flip the card over then print the other side on the back.

Once the ink is completely dry, score along all the dotted and dashed lines and cut out the holes before carefully cutting out the pieces.


Notice that the nose and moustache are cut round the edges and lifted out a little to give a 3D effect.

Roll the head round and glue it down.


Curve the hat into a cone and thread it up through the head. Glue the bobble into place.


Glue the small tab to the back of the head.


Fold over and glue down the arms and legs to make double thickness card.


Fold over and glue together the push rod ends and cams to make double thickness card.


Cut them out once the glue is dry


Glue the arm push rod to the arm as shown.


Fold up the body inner.


Glue together the three parts of the body.

Fit the body inner into the body.


Thread the arm push rods and arms through the holes in the side of the body and glue them to the tab. Make sure that the arms are free to flap up and down.


Glue the tab on the back of the head to the grey area on the back of the body.


Assemble the leg support parts and glue the legs into position.


Glue the legs into the body.


Roll up and make the various tubes lining up their edges with the arrow points.


Assemble the push rod. Glue the push rod end into place with the shortest tube threaded into position.


Assemble the two crank pieces.


Thread the two cams onto the crank pieces and glue them down.


Glue the crank pieces to the centre axle. Make sure that they are lined up.


Fit the two axle tubes into place.


Glue together the two parts of the cam follower. Thread the cam follower tube into place and glue it down.


Make up the four spaces by folding in half and gluing down the small rectangles making four double thickness squares.


Thread the cam follower down onto the push rod. Don't glue it! It must be free to move up and down. Glue two spacers into place on the end of the slider tube as shown.


Slide the other two slider tubes into place. Glue the two remaining spacer pieces onto the second slider tube as shown.


Assemble the link pieces and use them to join together the two spacer pieces on each side. Make sure no glue gets onto the centre slider tube.


Assemble the box top and box base by make triangle section tubes.


Assemble the two box sides by making right angle triangle tubes.


Join the four box pieces together. Use the picture to ensure they are in the correct order.


Thread the push rod assembly up through the box top and glue the centre slider tube to the box top tab.

Fit the axles through the holes in the box sides.


Fold up and complete the box keeping everything as square as possible.


Assemble the handle in three steps as shown.


Glue the handle into place. Notice that the cam follower assembly is at the front and the handle is on the right.


Tightly fold up a couple pennies (4 grams each 20mm diameter) into an off-cut of card.


Glue the coin bundle to the front of the cam follower.


Thread Santa down onto the top of the push rod. He should be facing towards the front where the cam follower and coins are.

Glue the ends of the arm push rods to the top slider tube.


That should do it! Turn the handle and Santa will flap his arms three times for each time he swoops. Ho ho ho!

 


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Another of my designs from the Brother International website. Pull up the body on the easy to make paper girl and the arms raise upwards. Way hay!


Everyone can download and make the paper girl for free from the Brother website here.


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£2.50
Download Shark Attack
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Shark Attack!

Turn the handle and the sharks circle menacing around the boat. Duuh duh! Duuh duh!

This model uses a variant of the mesh gear essential mechanism which I will shortly be releasing as a stand alone project.

Paid subscribers to robives.com can download the model for free at the link, thanks for your support! Non-members can download the parts file for £2.50


The model comes in both coloured and non-coloured versions. Print out the one you choose onto thin card. (230gsm/67lb is ideal) Score along the dotted and dashed lines and cut out the holes before carefully cutting out the pieces.


Fold over the gears to make double thickness card and glue them down.


Once the glue is dry carefully cut them out.


Roll up the three axle tubes carefully lining up the edges with the arrows as shown.


Fit the pinion gear into the pinion tube lining it up with the grey line and gluing it into place with the tabs.

Fit the 8mm tube into the square tube lining it up between the two grey lines.


Fit the gear shaft into the large gear and thread in the 9mm axle tube so that it lines up at the bottom face of the gear.


Fold round and glue the base piece leaving the ends unglued. Fit the base spacer into position. The end of a chop stick can be handy for reaching inside the base when gluing the tabs on the spacer down.


Glue closed to complete the base.


Fold up and glue the box front and box back. Note that the long triangle tube is a right angled triangle.


Crease the score lines on the box sides in preparation for assembly.

Note the four grey alignment arrows, arrowed in the picture.


Glue the two sides to the base between the alignment arrows.


With the two sides glued into place, glue and push home the 7mm tube.


Fit the large gear over the 7mm tube. It should be free to turn smoothly.


Glue the box front to one of the box sides. Make sure you glue it to one of the edges closest to the rectangular holes in the side pieces.


Join the box front to the other box side.


Fit the axle support between the two box sides making sure that the circular hole is facing towards the front of the box.


Thread the pinion gear into place between the box front and the axle support.


Glue the box back into place.


Thread the box top down over the vertical axle tubes and glue the top into place.


Assemble the handle in three steps as shown.


Glue the handle to the pinion shaft.

Once the glue is dry turning the handle should turn the outer of the two vertical shafts. The centre vertical shaft should remain stationary.


Glue together the rotating disk and tube.


Make up the shark fins from double thickness card. Once the glue has dried carefully cut them out.


Glue the fins to the disk. The wake pattern on the disk should be behind the fin.


Fit the rotating disk to the outer vertical tube. Turn the handle and test that the disk turns properly.


Assemble the boat stand and boat stand inner.


Fit the boat stand to the inner vertical tube.


Assemble the two parts of the boat.


Fit the boat onto the boat stand, you won't need to glue it down.


Assemble the boater man from double thickness card.


Glue him into the back of the boat to complete the model.

Turn the handle to see the sharks circle menacingly round the boat!


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