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essential mechanism

Co-axial Gear 2:1

£2.50

Your rating: None (3 votes)

Co-axial gear with 2:1 reduction.

This Essential Mechanism is an evolved version of the original Co-Axial Gearbox from here. While I was designing the forthcoming rotating robot model I felt it would be better if the robot rotated a little slower so I have increased the size of the main gears on the original co-axial gearbox so that there is now a roughly 2:1 speed reduction. The mechanism will, I'm sure, be useful for other projects so I decided to release it as an Essential Mechanism. Turn the handle on the side of the box and the outer vertical shaft turns one way while the inner shaft rotates the other.


Members can download the model for free from the link, thank you for your support! Non-members can join in the fun for $3.75/£2.50

Download the file and print out the pages onto thin card (230 micron / 67lb) I used coloured card for a colourful model. You can use white, patterned or colour card as you see fit.

Score along 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 and glue them down. Once the glue is completely dry carefully cut them out.


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


Fold over and glue the tabs on the ends to make triangular tube.


Roll over and glue all three tubes. Line up the edges with the arrow points as accurately as possible.


Fit the small stub into the nine tooth pinion.


Fit the short 8mm axle into the pinion and glue it so that it protrudes roughly 5mm from the other side.


Fit the axle stub into the large gear with the small hole.


Fit the long 8mm axle into place so that the grey area is inside the stub. Make sure the gear is a straight and flat as possible.


Fit the axle stub into the remaining gear.


Glue in the 10mm tube again lining it up with the grey area and again keeping the gear as straight as possible.


Thread the two axles one inside the other. No glue! They must be free to rotate.


Assemble the handle in three steps.


Glue the the two ends to the base. Note carefully the relative orientations of the three parts.


Glue one end of the top into position but leave the other end unglued.


Thread the axle up through the box top then fit the other end into the box base.


Thread the pinion into place in the cross piece.


Thread the short axle out through the box end.


Close up the box and glue the remain top edge to close the box.


Fold in the sides and glue them into place.


Glue the end tabs of the cross piece to the outside of the box.


Fit the cover piece into place.


Complete the mechanism by adding the handle to the box.

Use the model as an exercise in pure mechanism or as the starting point for your own paper animation automata. Look out for the Rotating Robot coming soon!

Co-axial gear with 2:1 reduction.

This Essential Mechanism is an evolved version of the original Co-Axial Gearbox from here. While I was designing the forthcoming rotating robot model I felt it would be better if the robot rotated a little slower so I have increased the size of the main gears on the original co-axial gearbox so that there is now a roughly 2:1 speed reduction. The mechanism will, I'm sure, be useful for other projects so I decided to release it as an Essential Mechanism. Turn the handle on the side of the box and the outer vertical shaft turns one way while the inner shaft rotates the other.


Members can download the model for free from the link, thank you for your support! Non-members can join in the fun for $3.75/£2.50

Download the file and print out the pages onto thin card (230 micron / 67lb) I used coloured card for a colourful model. You can use white, patterned or colour card as you see fit.

Score along 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 and glue them down. Once the glue is completely dry carefully cut them out.


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


Fold over and glue the tabs on the ends to make triangular tube.


Roll over and glue all three tubes. Line up the edges with the arrow points as accurately as possible.


Fit the small stub into the nine tooth pinion.


Fit the short 8mm axle into the pinion and glue it so that it protrudes roughly 5mm from the other side.


Fit the axle stub into the large gear with the small hole.


Fit the long 8mm axle into place so that the grey area is inside the stub. Make sure the gear is a straight and flat as possible.


Fit the axle stub into the remaining gear.


Glue in the 10mm tube again lining it up with the grey area and again keeping the gear as straight as possible.


Thread the two axles one inside the other. No glue! They must be free to rotate.


Assemble the handle in three steps.


Glue the the two ends to the base. Note carefully the relative orientations of the three parts.


Glue one end of the top into position but leave the other end unglued.


Thread the axle up through the box top then fit the other end into the box base.


Thread the pinion into place in the cross piece.


Thread the short axle out through the box end.


Close up the box and glue the remain top edge to close the box.


Fold in the sides and glue them into place.


Glue the end tabs of the cross piece to the outside of the box.


Fit the cover piece into place.


Complete the mechanism by adding the handle to the box.

Use the model as an exercise in pure mechanism or as the starting point for your own paper animation automata. Look out for the Rotating Robot coming soon!

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< | >

Shaker

£2.50

Your rating: None (3 votes)

This Essential Mechanism is an alternative version of the square shaker mechanism here. In this version, the vertical shaft is positioned towards the front of the box. This makes it suitable for a character shaking its head such as the bear shown below. Turn the handle and the vertical shaft twists quickly back and forth by around 30°.

Members can download the model for free at the link. Non members can join in the fun for £2.50.


Print out the parts onto thin card. (230 micron / 67lb) I used coloured card for the moving parts to make a colourful model.

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


Roll round the two axle tubes and glue them down.


Make up the handle in three steps.


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


Cut out the cam part.


Glue the cams to the cam shaft.


Thread the axle into place in the cam shaft.


Fold round the glue the tabs on the box top and box base to make right-angled triangle tubes.


Fold round and glue down the tabs on the box front and back to make triangle section tubes.


Glue the box front to the base as shown.


Glue the box back to the base.


Glue the striker plate to the vertical axle tube then fold it round and glue it into place.


Thread the vertical axle tube into place.


Fit the vertical axle into the hole in the base. Thread the box top onto the vertical axle and glue it to the box front and back.


Fit the cam shaft into place. Glue the box sides into position.


Fold the four flaps in and glue them to the inside walls of the box.


Glue the handle into place to complete the model.

Use the shaker model as an exercise in pure mechanism or as the starting point for your own paper animation characters.

This Essential Mechanism is an alternative version of the square shaker mechanism here. In this version, the vertical shaft is positioned towards the front of the box. This makes it suitable for a character shaking its head such as the bear shown below. Turn the handle and the vertical shaft twists quickly back and forth by around 30°.

Members can download the model for free at the link. Non members can join in the fun for £2.50.


Print out the parts onto thin card. (230 micron / 67lb) I used coloured card for the moving parts to make a colourful model.

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


Roll round the two axle tubes and glue them down.


Make up the handle in three steps.


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


Cut out the cam part.


Glue the cams to the cam shaft.


Thread the axle into place in the cam shaft.


Fold round the glue the tabs on the box top and box base to make right-angled triangle tubes.


Fold round and glue down the tabs on the box front and back to make triangle section tubes.


Glue the box front to the base as shown.


Glue the box back to the base.


Glue the striker plate to the vertical axle tube then fold it round and glue it into place.


Thread the vertical axle tube into place.


Fit the vertical axle into the hole in the base. Thread the box top onto the vertical axle and glue it to the box front and back.


Fit the cam shaft into place. Glue the box sides into position.


Fold the four flaps in and glue them to the inside walls of the box.


Glue the handle into place to complete the model.

Use the shaker model as an exercise in pure mechanism or as the starting point for your own paper animation characters.

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< | >

Shaker Square

£2.50

Your rating: None (2 votes)

The Square Based Shaker, Turn the handle on this Essential Mechanism and the vertical shaft turns briskly back and forth. Use the shaker mechanism as an interesting demonstration of pure paper engineering or as a starting point for your own character based paper automata. Members and Patrons can download the parts for free from the link, thanks for your support! Non-members can join in the fun for £2.50. Become a member now and you can download this and all the other projects on the site for free! More details here.


Print out the parts onto thin card. (230 micron / 67lb) I used coloured card to make a colourful model.

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


Check out the Instagram animation here.


The cam fingers are made from double thickness card. Fold them over and glue them down making sure not to glue down the tabs.


Once the glue is dry carefully cut them out.


Make up the axle outer and glue the cams into place.


Roll round and glue the two inner axles as shown.


Thread the cam shaft axle into place and fix it with a dot of glue.


Assemble the handle in three steps.


Make up the striker plate as shown.


Thread the vertical axle into the striker plate assemble as shown and fix with a dot of glue.


Fold round and glue down the tabs on the top and base of the box making right angled triangle tubes.


Fold in the side tabs making equilateral triangle tubes.


Glue the base to one of the sides lining up the edge of the tab with the edge of the side as shown.


Glue on the other side then glue the top to one of the sides. Make sure that the holes on the sides are opposite each other.


Thread the long end of the striker plate assembly up through the hole in the top of the box.


Thread the cam shaft into position between the sides.


Fold down the top and glue it into place.


Glue down the side flaps making sure that the box is square.

Finish of the project by gluing the handle into place.


Now that you have a completed Shaker Mechanism, why not design and make a character to fit onto it and bring to life!

The Square Based Shaker, Turn the handle on this Essential Mechanism and the vertical shaft turns briskly back and forth. Use the shaker mechanism as an interesting demonstration of pure paper engineering or as a starting point for your own character based paper automata. Members and Patrons can download the parts for free from the link, thanks for your support! Non-members can join in the fun for £2.50. Become a member now and you can download this and all the other projects on the site for free! More details here.


Print out the parts onto thin card. (230 micron / 67lb) I used coloured card to make a colourful model.

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


Check out the Instagram animation here.


The cam fingers are made from double thickness card. Fold them over and glue them down making sure not to glue down the tabs.


Once the glue is dry carefully cut them out.


Make up the axle outer and glue the cams into place.


Roll round and glue the two inner axles as shown.


Thread the cam shaft axle into place and fix it with a dot of glue.


Assemble the handle in three steps.


Make up the striker plate as shown.


Thread the vertical axle into the striker plate assemble as shown and fix with a dot of glue.


Fold round and glue down the tabs on the top and base of the box making right angled triangle tubes.


Fold in the side tabs making equilateral triangle tubes.


Glue the base to one of the sides lining up the edge of the tab with the edge of the side as shown.


Glue on the other side then glue the top to one of the sides. Make sure that the holes on the sides are opposite each other.


Thread the long end of the striker plate assembly up through the hole in the top of the box.


Thread the cam shaft into position between the sides.


Fold down the top and glue it into place.


Glue down the side flaps making sure that the box is square.

Finish of the project by gluing the handle into place.


Now that you have a completed Shaker Mechanism, why not design and make a character to fit onto it and bring to life!

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< | >

Contra-Rotating Robot Prototype

Your rating: None (2 votes)

I've completed an early first draft of my proposed counter rotating robot model. Definitely needs a snappier name!


The model uses a modified version of the coaxial drive, turn the handle and the head rotates one way and the body the other, the final effect is, though I say so myself, rather cool!

I've extended the two drive axles from the original Essential Mechanisms so that they are longer than the originals. Note that the 8mm shaft extends further down through the box than the 10mm shaft which is why is doesn't extend far above the outer shaft.

I've made a pair of legs with a hollow centre for the drive shaft.

The legs fit to the box top with a pair of temporary feet at their ankles.

To finish off, the body fits to the outer shaft via a spider. The head fits to the inner shaft in the same way. For version two I'll need to extend the inner axle by another 20mm or so. Looking good so far and it works a treat!
Time to scan and transfer the robot parts to the computer.

 

I've completed an early first draft of my proposed counter rotating robot model. Definitely needs a snappier name!


The model uses a modified version of the coaxial drive, turn the handle and the head rotates one way and the body the other, the final effect is, though I say so myself, rather cool!

I've extended the two drive axles from the original Essential Mechanisms so that they are longer than the originals. Note that the 8mm shaft extends further down through the box than the 10mm shaft which is why is doesn't extend far above the outer shaft.

I've made a pair of legs with a hollow centre for the drive shaft.

The legs fit to the box top with a pair of temporary feet at their ankles.

To finish off, the body fits to the outer shaft via a spider. The head fits to the inner shaft in the same way. For version two I'll need to extend the inner axle by another 20mm or so. Looking good so far and it works a treat!
Time to scan and transfer the robot parts to the computer.

 

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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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< | >

Crank Cam

£2.50

Your rating: None (1 vote)

Crank/Cam Essential Mechanism. Turn the handle and the main push rod turns once per turn of the handle while the slip sleeve move three times per turn. This mechanism is at the heart of the Die Fledermaus model and the Flying Santa projects. Use this Essential Mechanism as the starting point for your own animated character designs or as an exercise in pure mechanism!

Members and Patrons can download the parts for free, make sure that you are logged in then simple click the download link. Thanks for your support! Non-members can join in the fun for £2.50/$3.75


Print out the parts onto thin card. (230gsm / 67lb) I used coloured card for a colourful model. You could use white, coloured or patterned card as you choose. Score along the dotted and dashed lines and cut out the holes before carefully cutting out the parts.


Some of the parts are made from double thickness card for extra strength. Fold them over and glue them down. Once the glue is dry carefully cut them out.

Cams

Cranks Ends

Spacers


Assemble the two crank sections.


Roll up and glue the four axle tubes lining up the edges with the points of the triangles as accurately as possible.


Thread the two crank ends onto the shortest axle tube and glue them to the marked area on the push rod. The axle tube should turn freely in the crank ends.


Glue the crank pieces to the axle tube as shown.


Assemble the slider tubes.


Glue the cam follower holder to one of the slider tubes.


Glue the longest axle so that it is centred in the cam follower tube.


Glue two of the spacers to the top of the follower assembly.


Glue the other two spacers to the other slider tube.


Slide one of the cams onto the crank. Make sure that it is oriented the same way as in the picture. Glue it to the side of the crank piece.


Glue the other cam into position as shown.


Slide the cam follower assembly down the push rod as show. It should move freely up and down the push rod.


Slip the other slider tubes into position.


Assemble the two long links. Use them to link together the spacers on the slider tubes as shown.


Find a small coin. (20mm diameter / 4 grams) A UK penny is ideal. Wrap it tightly in an off-cut of card.


Glue the coin to the front of the cam follower assembly in the position shown.


Fold up and glue the two sides.


Fold up and glue the box top and box base.


Glue together the four sections of the box as accurately as possible. Note that the circular holes are closest to the base piece.


Fold round and glue the box.


Thread the push rod up through the hole in the box top and glue the lower slider tube to the tab.


Fit the two remaining axles in through the box holes into the crank.


Assemble the handle in three steps.


Glue the handle into place to complete the model.


The completed model


What animated character will you design for yours?

Crank/Cam Essential Mechanism. Turn the handle and the main push rod turns once per turn of the handle while the slip sleeve move three times per turn. This mechanism is at the heart of the Die Fledermaus model and the Flying Santa projects. Use this Essential Mechanism as the starting point for your own animated character designs or as an exercise in pure mechanism!

Members and Patrons can download the parts for free, make sure that you are logged in then simple click the download link. Thanks for your support! Non-members can join in the fun for £2.50/$3.75


Print out the parts onto thin card. (230gsm / 67lb) I used coloured card for a colourful model. You could use white, coloured or patterned card as you choose. Score along the dotted and dashed lines and cut out the holes before carefully cutting out the parts.


Some of the parts are made from double thickness card for extra strength. Fold them over and glue them down. Once the glue is dry carefully cut them out.

Cams

Cranks Ends

Spacers


Assemble the two crank sections.


Roll up and glue the four axle tubes lining up the edges with the points of the triangles as accurately as possible.


Thread the two crank ends onto the shortest axle tube and glue them to the marked area on the push rod. The axle tube should turn freely in the crank ends.


Glue the crank pieces to the axle tube as shown.


Assemble the slider tubes.


Glue the cam follower holder to one of the slider tubes.


Glue the longest axle so that it is centred in the cam follower tube.


Glue two of the spacers to the top of the follower assembly.


Glue the other two spacers to the other slider tube.


Slide one of the cams onto the crank. Make sure that it is oriented the same way as in the picture. Glue it to the side of the crank piece.


Glue the other cam into position as shown.


Slide the cam follower assembly down the push rod as show. It should move freely up and down the push rod.


Slip the other slider tubes into position.


Assemble the two long links. Use them to link together the spacers on the slider tubes as shown.


Find a small coin. (20mm diameter / 4 grams) A UK penny is ideal. Wrap it tightly in an off-cut of card.


Glue the coin to the front of the cam follower assembly in the position shown.


Fold up and glue the two sides.


Fold up and glue the box top and box base.


Glue together the four sections of the box as accurately as possible. Note that the circular holes are closest to the base piece.


Fold round and glue the box.


Thread the push rod up through the hole in the box top and glue the lower slider tube to the tab.


Fit the two remaining axles in through the box holes into the crank.


Assemble the handle in three steps.


Glue the handle into place to complete the model.


The completed model


What animated character will you design for yours?

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< | >

Crank/Cam Prototype - Almost Complete

Your rating: None (4 votes)

I've completed the layout of parts for this Crank/Cam Essential Mechanism. The final tweaks to the cam profile have made the finished mechanism run beautifully smoothly. As the handle is turned the main orange push-rod traces out an almost circular path above the box top.


The pink cams move the yellow cam follower up and down on the push rod three times for each turn of the handle.


The mechanism will make a really interesting starting point for your own paper animation characters, especially as a flying model where the character's wings flap briskly and the character rocks back and forth. Next step, assembly photography then I'll release the completed kit.

I've completed the layout of parts for this Crank/Cam Essential Mechanism. The final tweaks to the cam profile have made the finished mechanism run beautifully smoothly. As the handle is turned the main orange push-rod traces out an almost circular path above the box top.


The pink cams move the yellow cam follower up and down on the push rod three times for each turn of the handle.


The mechanism will make a really interesting starting point for your own paper animation characters, especially as a flying model where the character's wings flap briskly and the character rocks back and forth. Next step, assembly photography then I'll release the completed kit.

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< | >

Rack and Pinion

£2.50

Your rating: None (1 vote)

Rack and Pinion, an Essential Mechanism to download and make. As the pinion turns the rack moves back and forth. Make this model as as exercise in pure mechanism or as the starting point for your own paper animation characters. The mechanism converts rotary motion of the crank wheel at the front of the box to straight line motion of the rack. You could use it to move a car across the box top, have a tortoise extend its neck out of its shell or perhaps make a frog with an extendible tongue! You can see an animation of the rack and pinion here

Members and patrons can download the model for free, thanks for signing up! Non members can join in the fun for £2.50 at the link above.


Print the three parts sheets onto thin card (230gsm / 67lb) I used coloured card for a colourful model.

Cut out the holes then score along the dotted and dashed lines before carefully cutting out the parts.


Fold over and glue down the rack to make double thickness card. Once the glue is dry carefully cut out the rack teeth.


Make the crank wheel from double thickness card.


Make the pinion from double thickness card ensuring that the centre tabs are lifted free from the glue.


The centre pieces are also made from double thickness card.


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


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


Assemble the rack slider and glue it to the rack.


Thread the rack tube to the slider tube ensuring that it is free to slide up and down the tube.


Glue the ends to the top, note the location of the holes in the box ends.


Glue the box base into position but don't glue the side tabs into position yet.


Thread the slider tube though one of the holes in the box ends. Note that the rack is parallel to and closest to the base.


Thread the other end of the slider tube into the other end of the box.


Splay out and glue down the tabs at both ends of the box.


Glue down the box side tabs.


Thread the pinion to the axle outer tube. Don't glue it into place as you will need to fine tune its position..


Roll round and glue the axle tube lining up the end as accurately as possible.


Thread the axle inner into place inside the axle outer. No need to glue, friction will hold it in position.


Fit the axle stub into the crank wheel.


Thread the side pieces to the pinion assembly and glue them to the marked areas on the box.


Move the pinion into position on the axle so that it meshes with the rack


Glue the crank wheel into position to complete the project.


Turn the crank wheel and the rack will move back and forth.

Rack and Pinion, an Essential Mechanism to download and make. As the pinion turns the rack moves back and forth. Make this model as as exercise in pure mechanism or as the starting point for your own paper animation characters. The mechanism converts rotary motion of the crank wheel at the front of the box to straight line motion of the rack. You could use it to move a car across the box top, have a tortoise extend its neck out of its shell or perhaps make a frog with an extendible tongue! You can see an animation of the rack and pinion here

Members and patrons can download the model for free, thanks for signing up! Non members can join in the fun for £2.50 at the link above.


Print the three parts sheets onto thin card (230gsm / 67lb) I used coloured card for a colourful model.

Cut out the holes then score along the dotted and dashed lines before carefully cutting out the parts.


Fold over and glue down the rack to make double thickness card. Once the glue is dry carefully cut out the rack teeth.


Make the crank wheel from double thickness card.


Make the pinion from double thickness card ensuring that the centre tabs are lifted free from the glue.


The centre pieces are also made from double thickness card.


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


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


Assemble the rack slider and glue it to the rack.


Thread the rack tube to the slider tube ensuring that it is free to slide up and down the tube.


Glue the ends to the top, note the location of the holes in the box ends.


Glue the box base into position but don't glue the side tabs into position yet.


Thread the slider tube though one of the holes in the box ends. Note that the rack is parallel to and closest to the base.


Thread the other end of the slider tube into the other end of the box.


Splay out and glue down the tabs at both ends of the box.


Glue down the box side tabs.


Thread the pinion to the axle outer tube. Don't glue it into place as you will need to fine tune its position..


Roll round and glue the axle tube lining up the end as accurately as possible.


Thread the axle inner into place inside the axle outer. No need to glue, friction will hold it in position.


Fit the axle stub into the crank wheel.


Thread the side pieces to the pinion assembly and glue them to the marked areas on the box.


Move the pinion into position on the axle so that it meshes with the rack


Glue the crank wheel into position to complete the project.


Turn the crank wheel and the rack will move back and forth.

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< | >