When you develop a catapult v three straightforward machines as part of the design (lever, pulley, screw), you add multiple level of intricacy to an currently elegantly conceived machine. Change trajectory, control cause mechanism and also launch ping pong balls with much more thoughtful plans than just point and release.
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We are accustomed come teaching with a model in former of a child, however these instructions have to make that so that anyone can build one there is no our presence. We advice that parents and also teachers be there to overview – yet to enable the son to try to allow the materials (and a photo of the last product) guide them. A not correct direction is constantly un-doable till you"ve glued something.
The Parts. Us use timber Glue yet White adhesive is good too.
Step 1. Making sure you have determined the top and bottom side of the base. Apply glue into the notches because that the uprights and also tap them into them so the they stand flat on the table when inserted into the notches. It need to look favor the second picture here.
Step 2. Hammer the nails right into the little holes in the bottoms of the uprights so that they are secure.
Step 3. ar two 1/4" dowels into one the the uprights as shown and the 3rd dowel with the topmost feet in the "arm" of the catapult.
Step 4. attach the "arm" come the uprights by advertise the dowel through the bottom feet on the arm. Make certain the "arm" is walk in the ideal direction once you affix it. Look in ~ the picture. Push the peak dowel through the hole on the optimal of the other upright.
Step 5. attach one of the tan rubberbands to the dowel ~ above the topf that the uprights and bring it around the arm and also onto the various other side. (See the picture).
Step 6. lug the string up and around the sheave in the arm. (See the picture).
Step 7. climate down, around and also up around the wheel in the base. (See the picture).
Step 8. put the quick dowel through the feet on the cause piece and also slide it right into the bottom of the base so the it deserve to be pushed down right into the slot to secure it. (See the pictures).
Step 9. ~ above the top side, take the little rubberband and attach it come the trigger and also thumbtack it to the side of the base. (See the pictures).
Step 10. press in and also twist the screw eyes to the small holes top top the front bottom that the catapult. (See the pictures). These aid you set the trajectory of your ping pong ball once it"s launched.
Step 11. connect the cable to the trigger. (See the pictures).
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perfect Simple device Catapult prepared to beginning a ping pong ball. (See the picture.)
You have to wear eye security whenever utilizing a catapult. Be sure to shoot away from yourself, and don"t put your face above the catapult when shooting it.