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This project is a cam powered T.Rex automata. The head and lower jaw are driven by separate cams which can be interchanged to change the way the T.Rex...
The project parts come as a file which can be downloaded here. Print out the parts onto thin card. (230 micron 67lb). Score along the dotted lines a...
Make up the base and the top in the same way as shown in the picture. Make sure that all the edges are at right angles.
Glue together the four parts of the body.
Assemble the lower jaw.
Glue together the head. Fold round and glue together the triangular head inner. Glue the head inner into place so that it is lined up with the creas...
Glue the two lower jaw tabs to the top back of the body. Make sure that the lower jaw is free to move up and down.
Glue the head tab into place on top of the lower jaw tabs.
Fold the legs and arms into half and glue them together to make double thickness card. Once the glue is dry carefully cut out the pieces.
Glue the lower legs to the grey areas on the body. Note that the legs bend forwards at the joint, use this to get the right leg on the right side. Gl...
Thread the jaw push rod up through the body and glue the tab to the grey area on the underside of the jaw.
Thread the head push rod up through the body and glue it to the head support piece as shown.
Glue the feet to the legs then glue the feet to the box top so that they are on either side of the hole with the back of the foot just touching the ba...
Fold up and glue together the two cam followers. Notice that the triangular section at the end of the cam follower use valley folds.
Glue the cam followers to the grey areas on the front of the box top.
Glue the end of the push rods to the backs of the cam followers. Pushing the cam followers should now move the head and the jaw.
Assemble the two parts of the box.
Glue the box body to the base. Make sure that it is straight and square.
Glue the top to the box, again making sure that it is straight and square.
Glue together the drive shaft tube. Glue the washer to the end. Thread the drive shaft through the holes in the box and fix the second washer into pl...
Assemble the handle in three steps. Fold over the two main parts and glue to make square section tubes. Fold one section into the other and glue them...
Glue the handle to the drive shaft. Make sure that it turns freely.
Making the interchangeable cams. This project features easily interchangeable cams. Make a set for each story you want to tell. There are two cam set...
Lift the cam followers out of the way and thread the cam shaft into the drive shaft so that the stop butts up with the box.
This cam pack makes the T.Rex eat. Nom nom nom!
Don't forget to complete the model by gluing the eyes into place otherwise it won't be able to track down its prey!
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