There must be a base The base rests on the table
There are two arms One arm is the CANTILEVERED ARM This arm holds the 200 gram mass
There are two arms The other arm holds the 500 gram counterweight
There seems to be two basic styles of cantilevered towers The Tall Crane and the Vee Crane
Glue, sewing thread and any type of wooden toothpick may be used Remember, thread is your friend!
Toothpicks come in many shapes 10.0 grams uses about 150 flat toothpicks. These are weak and vary a lot in quality Larger and thicker toothpicks weigh more, but are harder to break. It is okay to mix the types of toothpicks
Glue is IMPORTANT Do NOT use hot glue –Hot glue is too flexible and heavy –Joints will flex –The tower and arms will bend –The tower will weigh more than 10.0 grams –You will be VERY UNHAPPY
White or Wood Glue Easy to use Soaks into the wood Holds very well Easy to clean up Does not need ventilation during use Does not dry quickly
Superglues Dries quickly - much faster on flesh than on wood Does NOT soak into wood Accelerator - catalyst to INSTANTLY harden the superglue Sticks to wax paper and plans
Epoxies Avoid using epoxies Heavy after drying Must mix in the proper ratio Does not dry fast Does not soak into wood
ARM HEIGHT - is measured with a ruler on a right triangle.
ARM HEIGHT - is measured to the lowest part of the arm above the center of the 200 gram mass
ARM LENGTH - is measured from the front of the base to the point under the center of the 200 gram mass
Place toothpicks over the plans Use pins to hold the toothpicks in place until the glue dries. When the side is finished, take out all the pins and remove the side from the wax paper. Put glue on a toothpick and add it to the plans.
If the tower breaks before it is tested, it MUST be repaired or rebuilt for a grade to be earned.
The diagrams, answers to the questions and the sign off sheet should be turned in before leaving school the day the tower is due Make the diagrams BEFORE testing the tower (Just in case the tower breaks)
The Tower Project is worth 150 points, but more points than this may be earned Towers may be tested early to help ensure a good grade. Don’t wait to start working!
Cantilever Tower Project 10.0 grams or less Minimum arm height: 10.0 cm Minimum arm length 10.0 cm