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gear

Tooth, Slot & Crank

£2.50

Your rating: None (4 votes)

This project expands on the Tooth & Slot gear to make a usable Essential Mechanism. The pinion slot gear connected to the handle has nine slots, the gear has 27 teeth. The overall reduction is speed is 3:1.

Make the model as an exercise in pure engineering or as the starting point for your own paper animations.

 


Members and Patrons can download the parts for free at the link, non-members can join in the fun for £2.50 / $3.75USD

Print out the parts onto thin card. (230 micron / 67lb) I used different coloured sheets of card for a colourful model. Score along the dotted and dashed lines and cut out the holes before carefully cutting out the pieces.


Fold over the push rod end pieces and glue them down to make double thickness card. Cut them out once the glue is dry.


Repeat the process with the large gear. There are optional spoke holes on the back that you can cut out if you would like too.


Fold back one set of tabs and glue them down as shown in the second image.


Roll round and glue the pinion outer as shown.


Glue the flanges to the axle as shown.


Slip the pinion disk into place and glue it to the four tabs.


Add a thin layer of glue the nine tabs in the pinion outer and fit the pinion disk into place. Make sure the pinion is straight by turning the shaft.


Roll round and glue the axle tubes lining up the edges as accurately as possible.

Glue the axles into place lining them up with the grey lines.


Make up the remaining axle tubes. With the crank link tube threaded through the push rod ends, glue the push rod ends to the crank shaft as shown. Make sure the parts are as straight as possible.


Assemble the two crank parts.


Thread the longer of the two cranks through the hole in the gear and glue it into place.

Glue the two flanges into place.


Complete the crank shaft as shown. The parts should be glued together but the push rod should be free to turn.


Fold round and glue down the flaps in the side pieces as shown.


Look carefully at the sides and ends. Assemble the four pieces in the correct order and orientation shown.


Assemble the handle in three steps.


Thread the push rod up through the hole in the box top.


Fit the gear and the pinion into the appropriate holes.


Fold round the parts to close the box.


Fold in and glue down the flaps.


Finish the model by gluing the handle into place.


Ta daa!

This project expands on the Tooth & Slot gear to make a usable Essential Mechanism. The pinion slot gear connected to the handle has nine slots, the gear has 27 teeth. The overall reduction is speed is 3:1.

Make the model as an exercise in pure engineering or as the starting point for your own paper animations.

 


Members and Patrons can download the parts for free at the link, non-members can join in the fun for £2.50 / $3.75USD

Print out the parts onto thin card. (230 micron / 67lb) I used different coloured sheets of card for a colourful model. Score along the dotted and dashed lines and cut out the holes before carefully cutting out the pieces.


Fold over the push rod end pieces and glue them down to make double thickness card. Cut them out once the glue is dry.


Repeat the process with the large gear. There are optional spoke holes on the back that you can cut out if you would like too.


Fold back one set of tabs and glue them down as shown in the second image.


Roll round and glue the pinion outer as shown.


Glue the flanges to the axle as shown.


Slip the pinion disk into place and glue it to the four tabs.


Add a thin layer of glue the nine tabs in the pinion outer and fit the pinion disk into place. Make sure the pinion is straight by turning the shaft.


Roll round and glue the axle tubes lining up the edges as accurately as possible.

Glue the axles into place lining them up with the grey lines.


Make up the remaining axle tubes. With the crank link tube threaded through the push rod ends, glue the push rod ends to the crank shaft as shown. Make sure the parts are as straight as possible.


Assemble the two crank parts.


Thread the longer of the two cranks through the hole in the gear and glue it into place.

Glue the two flanges into place.


Complete the crank shaft as shown. The parts should be glued together but the push rod should be free to turn.


Fold round and glue down the flaps in the side pieces as shown.


Look carefully at the sides and ends. Assemble the four pieces in the correct order and orientation shown.


Assemble the handle in three steps.


Thread the push rod up through the hole in the box top.


Fit the gear and the pinion into the appropriate holes.


Fold round the parts to close the box.


Fold in and glue down the flaps.


Finish the model by gluing the handle into place.


Ta daa!

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< | >

Tooth and Slot Crank Design

Your rating: None (3 votes)

The tooth and slot gear from the previous project works really nicely. The motion is smooth and positive and in contract to the mesh gears the tooth and slot gears are lined up on the same plane. Time to make a project with a practical application.

I've decided to make a geared down crank slider which could be used as the starting point for a character based paper automata. Here's the first draft. Things are looking pretty good. The movement is smooth and the crank part works nicely. There is a 3:1 speed reduction which I am sure will be useful for future designs. Perhaps a model featuring a tortoise or a sloth.

As you would expect with a first draft there are a few modifications which I will need to make.


Firstly, I had flat bases to the teeth and really these serve no purpose. Making completely 'V' shaped teeth makes cutting the part out loads easier.


When I put the parts together the teethed wheel is over to one side in the slot. I'll change some dimensions to centre it out.


Oops! I'll make the box slightly taller or move the gear up a little so that the teeth don't catch on the box front.


Over all though, I like the way it has turned out. Next step, final prototype...

The tooth and slot gear from the previous project works really nicely. The motion is smooth and positive and in contract to the mesh gears the tooth and slot gears are lined up on the same plane. Time to make a project with a practical application.

I've decided to make a geared down crank slider which could be used as the starting point for a character based paper automata. Here's the first draft. Things are looking pretty good. The movement is smooth and the crank part works nicely. There is a 3:1 speed reduction which I am sure will be useful for future designs. Perhaps a model featuring a tortoise or a sloth.

As you would expect with a first draft there are a few modifications which I will need to make.


Firstly, I had flat bases to the teeth and really these serve no purpose. Making completely 'V' shaped teeth makes cutting the part out loads easier.


When I put the parts together the teethed wheel is over to one side in the slot. I'll change some dimensions to centre it out.


Oops! I'll make the box slightly taller or move the gear up a little so that the teeth don't catch on the box front.


Over all though, I like the way it has turned out. Next step, final prototype...

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< | >

Tooth & Slot

£2.50

Your rating: None (1 vote)

A Tooth and Slot Gear to download and make. Make this paper project as an exercise in pure paper mechanism! The slotted wheel has seventeen slots, the gear has twenty three teeth. I have tried various ways of making gears form paper. Along with the mesh gear design, this is one of my favourites!

Members and Patrons can download the parts for free, non-members can download the parts for £2.50 / $3.75

Print the parts onto thin card (230 micron / 67lb) I used multi coloured for a colourful model. Score the dotted and dashed lines and cut out the holes before carefully cutting out the various pieces.


Fold back one set of the tabs in the slotted strip and glue them down.


Roll round and glue the slotted ring.


Glue the slot brackets to the axle lining them up with the end of the axle. Thread down the slot base and glue it to the tabs.


Roll up and glue down the two axle tube as accurately as possible.


Thread one of the axle inners into place and secure it with a dot of glue.


Apply a small amount of glue to each of the tabs.


Rest the slot base onto glued tabs then press them into place for a secure joint.


Make up the gear from double thickness card and cut it out.


Glue the teeth brackets to the axle tube lining up the ends.

Fit the second axle inner into place.


Fit the gear into place.


Assemble the handle in three steps.


Make up the sides as shown.


Make up the ends as shown.


Glue the sides to the end with the cut-outs being sure to align it accurately.


Glue in the other end.


Glue down the sides on one side only.


Fit the two wheels into place.


Fold in and glue the sides.


Glue the handle into place to complete the model.

I really like how this gear has turned out and will be using a modified version in future models for sure! I hope you enjoyed making it too :-)

A Tooth and Slot Gear to download and make. Make this paper project as an exercise in pure paper mechanism! The slotted wheel has seventeen slots, the gear has twenty three teeth. I have tried various ways of making gears form paper. Along with the mesh gear design, this is one of my favourites!

Members and Patrons can download the parts for free, non-members can download the parts for £2.50 / $3.75

Print the parts onto thin card (230 micron / 67lb) I used multi coloured for a colourful model. Score the dotted and dashed lines and cut out the holes before carefully cutting out the various pieces.


Fold back one set of the tabs in the slotted strip and glue them down.


Roll round and glue the slotted ring.


Glue the slot brackets to the axle lining them up with the end of the axle. Thread down the slot base and glue it to the tabs.


Roll up and glue down the two axle tube as accurately as possible.


Thread one of the axle inners into place and secure it with a dot of glue.


Apply a small amount of glue to each of the tabs.


Rest the slot base onto glued tabs then press them into place for a secure joint.


Make up the gear from double thickness card and cut it out.


Glue the teeth brackets to the axle tube lining up the ends.

Fit the second axle inner into place.


Fit the gear into place.


Assemble the handle in three steps.


Make up the sides as shown.


Make up the ends as shown.


Glue the sides to the end with the cut-outs being sure to align it accurately.


Glue in the other end.


Glue down the sides on one side only.


Fit the two wheels into place.


Fold in and glue the sides.


Glue the handle into place to complete the model.

I really like how this gear has turned out and will be using a modified version in future models for sure! I hope you enjoyed making it too :-)

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< | >

Love Machine

£2.50

Your rating: None (4 votes)

The Love Machine - a Mechanical Metaphor.


Download the parts and make you very own Love Machine. Members and Patrons can download the parts for free, thanks for your support! Non-member can join in the fun for £2.50/$3.75

Print out the parts onto thin card. 230gsm / 67lb is about right.

Score all the dotted and dashed lines, cut out the holes then carefully cut out the parts.


Roll up and glue down the various tubes that make the axles. Line up the ends as accurately as possible.


Several of the parts are made from double thickness card. Fold them over and glue them down and let the glue dry completely before cutting them out.


Cut out the various gears.


Fold over and glue the hearts then cut them out.


The crown gear is made from two parts joined together. Fold over the teeth ends and glue them down to make double thickness card.


Join the two parts for the crown gear together.


Gently curve it round and glue it into a circle.


Glue the crown gear as accurately as possible within the thick dashed line on the box top.


Fold in and glue the tabs on the box top to make right angle triangle tubes.


Fold in and glue the tabs to make right angle triangle tubes on the base as well.


Fold the tabs on the sides over to make triangle tubes.


Fold the tabs on the front piece to make triangle tubes.


Fit the the axle into the large gear.


Fit the second axle to the medium gear lining up the end of the centre tabs with the end of the tube.


Thread the axle tube into place as shown.


Join together the sides and the box top.


Glue in the base then fold the box round and glue it closed as shown.


Thread the centre block into position and glue the tabs to the outer wall.


Position the large gear over the hole in the top of the centre block. Thread the axle tube down through the hole in the box top right down and into the centre block.


Fit the medium gear into position as shown.


Fit the front piece over the axle and glue it to the box front.


Assemble the handle in three steps as shown.


Fit the handle to the axle.


Glue the axle stub into the pinion gear and glue the wide tube into position so that it is flush with the bottom of the gear.


Cut two small nicks in the axle tube and glue in the heart.


Make up the three cups and glue them to the rotor side. Note that the centre cup is the other way up from the other two.


Glue on the other rotor side.


Secure the rotor to the vertical shaft. It should just touch the box top but should rotate freely when the box handle is turned.


Glue the two 8mm diameter axles to the end cup of the rotor.


Finish off the model by dropping the heart pinion gears into position over the vertical axle tubes and into the crown gear.


Turn the handle and marvel as the two hearts waltz around each other in perfect love and harmony!

The Love Machine - a Mechanical Metaphor.


Download the parts and make you very own Love Machine. Members and Patrons can download the parts for free, thanks for your support! Non-member can join in the fun for £2.50/$3.75

Print out the parts onto thin card. 230gsm / 67lb is about right.

Score all the dotted and dashed lines, cut out the holes then carefully cut out the parts.


Roll up and glue down the various tubes that make the axles. Line up the ends as accurately as possible.


Several of the parts are made from double thickness card. Fold them over and glue them down and let the glue dry completely before cutting them out.


Cut out the various gears.


Fold over and glue the hearts then cut them out.


The crown gear is made from two parts joined together. Fold over the teeth ends and glue them down to make double thickness card.


Join the two parts for the crown gear together.


Gently curve it round and glue it into a circle.


Glue the crown gear as accurately as possible within the thick dashed line on the box top.


Fold in and glue the tabs on the box top to make right angle triangle tubes.


Fold in and glue the tabs to make right angle triangle tubes on the base as well.


Fold the tabs on the sides over to make triangle tubes.


Fold the tabs on the front piece to make triangle tubes.


Fit the the axle into the large gear.


Fit the second axle to the medium gear lining up the end of the centre tabs with the end of the tube.


Thread the axle tube into place as shown.


Join together the sides and the box top.


Glue in the base then fold the box round and glue it closed as shown.


Thread the centre block into position and glue the tabs to the outer wall.


Position the large gear over the hole in the top of the centre block. Thread the axle tube down through the hole in the box top right down and into the centre block.


Fit the medium gear into position as shown.


Fit the front piece over the axle and glue it to the box front.


Assemble the handle in three steps as shown.


Fit the handle to the axle.


Glue the axle stub into the pinion gear and glue the wide tube into position so that it is flush with the bottom of the gear.


Cut two small nicks in the axle tube and glue in the heart.


Make up the three cups and glue them to the rotor side. Note that the centre cup is the other way up from the other two.


Glue on the other rotor side.


Secure the rotor to the vertical shaft. It should just touch the box top but should rotate freely when the box handle is turned.


Glue the two 8mm diameter axles to the end cup of the rotor.


Finish off the model by dropping the heart pinion gears into position over the vertical axle tubes and into the crown gear.


Turn the handle and marvel as the two hearts waltz around each other in perfect love and harmony!

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< | >

Mouse Machine

£2.50

Your rating: None (5 votes)

Mouse Machine, a paper animation kit to download and make. Turn the handle and mouse cranks his handle; or is it the other way round? Either way, members and patrons can download the model for free at the link. Non-members can join in the fun for $3.75/£2.50


Print out the parts onto thin card (230 micron / 67lb) Score along the dotted and dashed lines, cut out the holes then carefully cut out the pieces.


Several of the pieces are made from double thickness card. Fold them over and glue them down before carefully cutting them out.

Start by making the gears from double thickness card.


The arms need the hands inserting before they are glued down.


Once the glue is dry, cut them out.


Roll up the various tubes and glue them down lining up the edges carefully.


Glue one of the pinion axle tubes into the square pinion axle.


Assemble the handle in three steps.


Fit the pinion to the handle lining the edges of the tabs with the end of the handle.


Glue the other pinion axle tube into place


Fit the axle stub into the gear. Fit the gear axle inner into the axle stub so that it protrudes roughly 5mm from the other side of the gear.


Make up the crank.


Make the base using right angled triangle tubes as shown.


Make up the gear cover as shown.


Glue the two box halves together as shown.


Thread the axle into position through the hole in the box side.


Thread the pinion assembly through the other side hole and into the axle tube. A small dot of glue will secure it into position.


Found the box round and glue it down. Leave the top open for now.


Glue the base onto the tab numbered 1.


Fold the base up and glue it to the number 2 tab.

Glue the box lid down.


Glue the gear cover tab to the marked area on the base.


Thread the gear into position.


Lift up the gear cover and fit it into place.


Glue on the crank and the mouse handle.


Thread the mouse handle outer into position. No glue! It must be free to rotate. That completes the machine part.


Making the Mouse

Curve round the glue the body. Glue the two shoulder tubes into position.


Glue the feet to the legs. Make sure the two slots in the top of the legs (arrowed) are facing each other as shown.


Make up the leg hinge by folding over the flaps and gluing them down.


Fit the hinge into position.


Fit the body to the two tabs on the legs hinge. The body should be free to flex back and forth at the hips.


Glue the arms to the shoulders. The hands should be close together as shown.


Roll round the head to make a cone as shown.


Glue the ears into the inside of the head.


Glue the neck to the neck end then glue the neck to the inside back of the head.


Fit the head into the body. Glue the hands to the mouse handle outer.


Thread the mouse handle outer back into place on the mouse handle then glue the feet to the base.


Finish off the model by gluing on the tail.


Turn the handle to crank the mouse, or for the mouse to turn you...

Mouse Machine, a paper animation kit to download and make. Turn the handle and mouse cranks his handle; or is it the other way round? Either way, members and patrons can download the model for free at the link. Non-members can join in the fun for $3.75/£2.50


Print out the parts onto thin card (230 micron / 67lb) Score along the dotted and dashed lines, cut out the holes then carefully cut out the pieces.


Several of the pieces are made from double thickness card. Fold them over and glue them down before carefully cutting them out.

Start by making the gears from double thickness card.


The arms need the hands inserting before they are glued down.


Once the glue is dry, cut them out.


Roll up the various tubes and glue them down lining up the edges carefully.


Glue one of the pinion axle tubes into the square pinion axle.


Assemble the handle in three steps.


Fit the pinion to the handle lining the edges of the tabs with the end of the handle.


Glue the other pinion axle tube into place


Fit the axle stub into the gear. Fit the gear axle inner into the axle stub so that it protrudes roughly 5mm from the other side of the gear.


Make up the crank.


Make the base using right angled triangle tubes as shown.


Make up the gear cover as shown.


Glue the two box halves together as shown.


Thread the axle into position through the hole in the box side.


Thread the pinion assembly through the other side hole and into the axle tube. A small dot of glue will secure it into position.


Found the box round and glue it down. Leave the top open for now.


Glue the base onto the tab numbered 1.


Fold the base up and glue it to the number 2 tab.

Glue the box lid down.


Glue the gear cover tab to the marked area on the base.


Thread the gear into position.


Lift up the gear cover and fit it into place.


Glue on the crank and the mouse handle.


Thread the mouse handle outer into position. No glue! It must be free to rotate. That completes the machine part.


Making the Mouse

Curve round the glue the body. Glue the two shoulder tubes into position.


Glue the feet to the legs. Make sure the two slots in the top of the legs (arrowed) are facing each other as shown.


Make up the leg hinge by folding over the flaps and gluing them down.


Fit the hinge into position.


Fit the body to the two tabs on the legs hinge. The body should be free to flex back and forth at the hips.


Glue the arms to the shoulders. The hands should be close together as shown.


Roll round the head to make a cone as shown.


Glue the ears into the inside of the head.


Glue the neck to the neck end then glue the neck to the inside back of the head.


Fit the head into the body. Glue the hands to the mouse handle outer.


Thread the mouse handle outer back into place on the mouse handle then glue the feet to the base.


Finish off the model by gluing on the tail.


Turn the handle to crank the mouse, or for the mouse to turn you...

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< | >

Mouse Machine Progress Report

Your rating: None (2 votes)

Having completed the mechanism for the mouse machine it was time to attach the mouse!

I mocked up a mouse adding a hinge to his waist so that he can flex back and forth. I fixed his feet to the box top and his hands to a rotating sleeve fitted over the mouse's crank.


The model works well, you can see a video on Instagram here. I made some final adjustments to make the movement more pronounced. I've extended the mouse's crank and raised it up slightly then moved the mouse back a little.


The new movement has a more exaggerated feel, like the mouse is really putting his back into the cranking!

Now that I happy with the design I'll lay out the parts and add colour.

Having completed the mechanism for the mouse machine it was time to attach the mouse!

I mocked up a mouse adding a hinge to his waist so that he can flex back and forth. I fixed his feet to the box top and his hands to a rotating sleeve fitted over the mouse's crank.


The model works well, you can see a video on Instagram here. I made some final adjustments to make the movement more pronounced. I've extended the mouse's crank and raised it up slightly then moved the mouse back a little.


The new movement has a more exaggerated feel, like the mouse is really putting his back into the cranking!

Now that I happy with the design I'll lay out the parts and add colour.

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< | >

Mouse Machine Mechanism Prototype

No votes yet

First draft of the Mouse Machine mechanism. I've put together a model as a test of the layout I sketched out earlier. The mouse will fit on the base plate and will appear to be operating the crank as the handle is turned.


There were a couple of problems with the first draft.

First, the main gear was intended to be flush with the box front but was being pushed away by the pinion gear.

Secondly I had initially made the crank and pinion as two separate parts but on completion it looked like they would be better as a single unit.


Rather than completely remake the model I employed a trick I often use when prototyping. The axle holes in the box side needed to be moved back by 3mm so I remade just the sides with the holes in the correct place, I expanded the hole in the original box, then glued the new sides into place creating a repositioned pair of axle holes.


I also make up a new handle with a longer shaft and glued the pinion to it.


With the drive axle in place I fitted a lock piece to the end opposite the pinion to stop the axle coming out then fitted the yellow horizontal handle to complete the mechanism.


With everything in place it is time to move to the next stage, making a mouse with shoulder and hip joints.

First draft of the Mouse Machine mechanism. I've put together a model as a test of the layout I sketched out earlier. The mouse will fit on the base plate and will appear to be operating the crank as the handle is turned.


There were a couple of problems with the first draft.

First, the main gear was intended to be flush with the box front but was being pushed away by the pinion gear.

Secondly I had initially made the crank and pinion as two separate parts but on completion it looked like they would be better as a single unit.


Rather than completely remake the model I employed a trick I often use when prototyping. The axle holes in the box side needed to be moved back by 3mm so I remade just the sides with the holes in the correct place, I expanded the hole in the original box, then glued the new sides into place creating a repositioned pair of axle holes.


I also make up a new handle with a longer shaft and glued the pinion to it.


With the drive axle in place I fitted a lock piece to the end opposite the pinion to stop the axle coming out then fitted the yellow horizontal handle to complete the mechanism.


With everything in place it is time to move to the next stage, making a mouse with shoulder and hip joints.

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< | >

Rotobot

£2.50

Your rating: None (5 votes)

Rotobot - the Counter-Rotating Robot!

A paper animation kit to download, print out and make.

Turn the handle on the Rotobot and the head rotates one way whilst the body rotates the other.

This model is based around the co-axial drive model featured here. Members can download the model for free, thank you for signing up! Non-members can join in the fun for $3.75/£2.50



Download and print out the five pages onto thin card (230 micron / 67lb) Score along the dotted and dashed lines and cut out the holes before carefully cutting out the parts.


The gears are made from double thickness card for extra strength. Fold them in half and glue them down then when the glue is completely dry carefully cut them out.


Fit the matching axle stub into each of the gears.


Fold up and glue the top and base making right angle triangle tubes.


Fold over and glue the flaps on the box ends and the cross piece making equilateral triangle tubes.


Roll up and glue the three axle tubes as accurately as possible.


Glue the box end to the base as shown.


Glue the 8mm axle to the gear with the smaller hole as shown. Make sure it is the right way up.


Glue the 10mm axle to the gear with the larger hole as shown. Make sure it is the right way up.


Glue the short axle to the pinion gear.


Thread the wider axle over the narrower one. They should be free to rotate.


Assemble the handle in three steps.


Glue the other end of the box into place.


Glue the box top into position leaving one end opened as shown.


Thread the gears up through the box top and fit them into place.


Fit the pinion gear into the cross piece.


Thread the pinion axle out through the box end.


Glue down the box top. Fold in and glue the side flaps then glue the cross piece into position.


Thread the box top down over the axle.


Glue the box top to the box and glue on the handle to complete the base.


Making the Robot

The arms are made from double thickness card. Fold them over and glue them down making sure not to glue the tabs together. Once the glue is dry carefully cut them out.


Glue the nose to the head.


Roll the head round and glue it to the head top.


Glue the jaw into position.


Roll up the neck tube and glue it to the inside top of the head.


Glue the body to the body top as shown.


Roll the body tube so that the colour is on the inside. Fit it into the body top and glue it down.


Join together matching pairs for body spiders as shown.


Glue the spiders to the spider inner making this support structure.


Fit the spider into the body and glue it down.


Make the legs inner then glue on the legs outers.


Roll round the legs outer and glue them down.


Make up the neck spider in the same way as the body spider. Glue it to the grey areas on the head spider inner. Glue the head spider into place.


This completes the robot. The three parts should loosely fit together as shown.


Final Assembly

Glue the legs to the box top so that the axle is centred in the square tube.


Apply a small amount of glue to the outer axle tube and fit the body into place.


Apply a small amount of glue to the inside of the neck spider and glue it into place to complete the model.


Turn the handle to rotate your counter-rotating Rotobot!

Rotobot - the Counter-Rotating Robot!

A paper animation kit to download, print out and make.

Turn the handle on the Rotobot and the head rotates one way whilst the body rotates the other.

This model is based around the co-axial drive model featured here. Members can download the model for free, thank you for signing up! Non-members can join in the fun for $3.75/£2.50



Download and print out the five pages onto thin card (230 micron / 67lb) Score along the dotted and dashed lines and cut out the holes before carefully cutting out the parts.


The gears are made from double thickness card for extra strength. Fold them in half and glue them down then when the glue is completely dry carefully cut them out.


Fit the matching axle stub into each of the gears.


Fold up and glue the top and base making right angle triangle tubes.


Fold over and glue the flaps on the box ends and the cross piece making equilateral triangle tubes.


Roll up and glue the three axle tubes as accurately as possible.


Glue the box end to the base as shown.


Glue the 8mm axle to the gear with the smaller hole as shown. Make sure it is the right way up.


Glue the 10mm axle to the gear with the larger hole as shown. Make sure it is the right way up.


Glue the short axle to the pinion gear.


Thread the wider axle over the narrower one. They should be free to rotate.


Assemble the handle in three steps.


Glue the other end of the box into place.


Glue the box top into position leaving one end opened as shown.


Thread the gears up through the box top and fit them into place.


Fit the pinion gear into the cross piece.


Thread the pinion axle out through the box end.


Glue down the box top. Fold in and glue the side flaps then glue the cross piece into position.


Thread the box top down over the axle.


Glue the box top to the box and glue on the handle to complete the base.


Making the Robot

The arms are made from double thickness card. Fold them over and glue them down making sure not to glue the tabs together. Once the glue is dry carefully cut them out.


Glue the nose to the head.


Roll the head round and glue it to the head top.


Glue the jaw into position.


Roll up the neck tube and glue it to the inside top of the head.


Glue the body to the body top as shown.


Roll the body tube so that the colour is on the inside. Fit it into the body top and glue it down.


Join together matching pairs for body spiders as shown.


Glue the spiders to the spider inner making this support structure.


Fit the spider into the body and glue it down.


Make the legs inner then glue on the legs outers.


Roll round the legs outer and glue them down.


Make up the neck spider in the same way as the body spider. Glue it to the grey areas on the head spider inner. Glue the head spider into place.


This completes the robot. The three parts should loosely fit together as shown.


Final Assembly

Glue the legs to the box top so that the axle is centred in the square tube.


Apply a small amount of glue to the outer axle tube and fit the body into place.


Apply a small amount of glue to the inside of the neck spider and glue it into place to complete the model.


Turn the handle to rotate your counter-rotating Rotobot!

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Co-axial Drive

£2.50

Your rating: None (5 votes)

Presenting the Co-axial drive, or to give it its full title, the Counter-Rotating Co-axial drive. Ta daa!

Turn the handle on this Essential Mechanism and the inner axle rotates ones way whilst the outer axle rotates the other. Use this as a starting point for your own character based models or as an exercise in pure mechanism. Members and patrons can download the parts for free from the link. Thanks for signing up! Non members can join in the fun for £2.50


Print out the parts onto thin card (230 gsm/67lb). I used coloured card for the moving parts to make then stand out from the box. Score all the dotted and dashed lines and cut out the holes before carefully cutting out the parts.


The gears are made from double thickness card. Fold them over, glue them down then carefully cut them out.


Fit the matching axle stub to each axle.


Roll round and glue down the three axle tubes being careful to line up the edges with the points or the arrows.


Thread the gear with the large axle to the widest tube and glue it into place as shown.


Glue the second axle into place.


Fit the small gear to the final axle as shown


Assemble the handle in three steps.


Fold round and glue the box top and base making right angled triangle tubes.


Fold round and glue down the tabs on the box ends making equilateral triangle tubes.


Assemble the cross piece as shown.


Glue the box ends to the base. Note the flaps on the box base fold downwards. (second picture)


Glue one end of the top into place


Thread the small gear into the cross piece.


Fit the axle roughly into position through the hole in the box end.


Fit together the two other axles, one inside the other as shown. Thread them up through the hole in the box top.


Fold the top and gears down so that they mesh with the pinion gear and the box parts line up.


Close the box and glue the sides into position. Glue the cross piece into place.


Complete the model by fitting the handle.

Once the glue is dry, turn the handle and be amazed as the two shafts turn in opposite directions!

Presenting the Co-axial drive, or to give it its full title, the Counter-Rotating Co-axial drive. Ta daa!

Turn the handle on this Essential Mechanism and the inner axle rotates ones way whilst the outer axle rotates the other. Use this as a starting point for your own character based models or as an exercise in pure mechanism. Members and patrons can download the parts for free from the link. Thanks for signing up! Non members can join in the fun for £2.50


Print out the parts onto thin card (230 gsm/67lb). I used coloured card for the moving parts to make then stand out from the box. Score all the dotted and dashed lines and cut out the holes before carefully cutting out the parts.


The gears are made from double thickness card. Fold them over, glue them down then carefully cut them out.


Fit the matching axle stub to each axle.


Roll round and glue down the three axle tubes being careful to line up the edges with the points or the arrows.


Thread the gear with the large axle to the widest tube and glue it into place as shown.


Glue the second axle into place.


Fit the small gear to the final axle as shown


Assemble the handle in three steps.


Fold round and glue the box top and base making right angled triangle tubes.


Fold round and glue down the tabs on the box ends making equilateral triangle tubes.


Assemble the cross piece as shown.


Glue the box ends to the base. Note the flaps on the box base fold downwards. (second picture)


Glue one end of the top into place


Thread the small gear into the cross piece.


Fit the axle roughly into position through the hole in the box end.


Fit together the two other axles, one inside the other as shown. Thread them up through the hole in the box top.


Fold the top and gears down so that they mesh with the pinion gear and the box parts line up.


Close the box and glue the sides into position. Glue the cross piece into place.


Complete the model by fitting the handle.

Once the glue is dry, turn the handle and be amazed as the two shafts turn in opposite directions!

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Contra-Rotating Gear Prototype

Your rating: None (2 votes)

For a project I'm working on I need two disks, one on top of another, rotating in opposite directions. The mechanism is interesting and could be useful for other paper automata so I'll be putting it on the site as an Essential Mechanism.

Here is the first proof-of-concept stage. There will be two vertical axles, one inside the other. The plan is that the lower gear rotates the inner axle and the top gear rotates the outer axle. Both gears are rotated in opposite directions by the blue pinion gear. In this prototype the top and bottom gears have thirteen teeth and the pinion gear has nine teeth.


The next stage is to design the box. It will need to hold everything accurately in position whilst at the same time letting the gears rotate freely. Should be fun!

For a project I'm working on I need two disks, one on top of another, rotating in opposite directions. The mechanism is interesting and could be useful for other paper automata so I'll be putting it on the site as an Essential Mechanism.

Here is the first proof-of-concept stage. There will be two vertical axles, one inside the other. The plan is that the lower gear rotates the inner axle and the top gear rotates the outer axle. Both gears are rotated in opposite directions by the blue pinion gear. In this prototype the top and bottom gears have thirteen teeth and the pinion gear has nine teeth.


The next stage is to design the box. It will need to hold everything accurately in position whilst at the same time letting the gears rotate freely. Should be fun!

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