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Unformatted text preview: 1 Build a Lattice Tower For one lattice cube you need: 16 sheets of A4 paper 8 bolts (5 mm x 20 mm), washers and nuts (5 mm) a wooden stick for rolling the paper bars (35-40 cm long, 5-6 mm diameter) For the whole lattice tower (3 cubes) you need: 40 sheets of A4 paper 16 bolts (5 mm x 20 mm), washers and nuts (5 mm) a wooden stick for rolling the paper bars (35-40 cm long, 5-6 mm diameter) Furthermore, you need: paper punch (hole puncher) glue stick screwdriver wrench (spanner) Note on measures: A4-paper has the dimensions 297 mm x 210 mm. The important feature used is that the height-to-width ratio of the paper is equal to the square root of 2 (1.4142). Sheets of US-legal paper can be cut down to 12 inches to have the A4 format. Metric units are used, e.g.: 1000 mm is equal to 1 m 10 mm is equal to 1 cm 1 inch is equal to 2.54 cm The M5 x 20 mm bolts are roughly equivalent to bolts 3/4-inch in length and 3/16-inch in diameter. 1. Fold a sheet of paper in portrait format so that the back edge still protrudes about 3 cm. Now use the wooden stick to roll the paper to a tube. Start rolling the paper at the edge with the fold. 2. Put some glue along the top edge of the paper and nish rolling the bar. It is best to use a glue stick for this task. Press tight for a few seconds. Now you should have a slim and strong bar. 3. Flatten both ends of the bar and punch them with a strong paper punch. Make sure that there is at least half a centimeter of paper be- tween the bars end and the hole. 4. This is how your bar should look. To make a lattice cube you need 16 of these bars: 12 short bars and 4 long bars. You will get short bars if you roll the paper in portrait format. For long bars you simply turn the paper and roll it in landscape format. 5. Put the bars together to form a lattice, as shown in the centre im- age: the 12 short bars are used for the edges, the 4 long ones for the diagonals. A node is made by placing bars no. 1-4 on top of each other. Insert the bolt through the holes of each of the bars. (Note: The order of bars is different for top and bottom nodes!) Finally, put a washer and a nut on the bolt and tighten it with a screwdriver. 7. Now you can nish your cube. Use the remaining two bolts to at- tach the last vertical bar to the cube. The bolts heads must again point outwards. 8. This is your lattice cube. Try to test it by putting a rigid board on top of it. (Note that the board must be bigger than the cube, so that only the nodes will carry the load.) Then put a heavy weight on the board. If you have built the cube properly, you should be able to support 20 kg or more! 9. If you make more cubes you can use them to assemble a tower. Here we have used 3 cubes to form a lattice tower. Make sure you get the order right when you attach the bars of two cubes (you will have to remove 4 hor- izontal bars per cube). The correct order is shown in the right image....
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This note was uploaded on 11/23/2009 for the course CHM 151 taught by Professor Eugene during the Spring '09 term at Wake Tech.
- Spring '09