3The base rests on the table There must be a baseThe base rests on the table
4One arm is the CANTILEVERED ARM This arm holds the 200 gram mass There are two armsOne arm is the CANTILEVERED ARMThis arm holds the 200 gram mass
5The other arm holds the 500 gram counterweight There are two armsThe other arm holds the 500 gram counterweight
6There seems to be two basic styles of cantilevered towers The Tall Crane and the Vee Crane
7Glue, sewing thread and any type of wooden toothpick may be used Remember, thread is your friend!
8Toothpicks come in many shapes 10.0 grams uses about 150 flat toothpicks. These are weak and vary a lot in qualityLarger and thicker toothpicks weigh more, but are harder to break.It is okay to mix the types of toothpicks
9Glue is IMPORTANT Do NOT use hot glue Hot glue is too flexible and heavyJoints will flexThe tower and arms will bendThe tower will weigh more than 10.0 gramsYou will be VERY UNHAPPY
10White or Wood Glue Easy to use Soaks into the wood Holds very well Easy to clean upDoes not need ventilation during useDoes not dry quickly
11Superglues Dries quickly - much faster on flesh than on wood Does NOT soak into woodAccelerator - catalyst to INSTANTLY harden the superglueSticks to wax paper and plans
12Epoxies Avoid using epoxies Heavy after drying Must mix in the proper ratioDoes not dry fastDoes not soak into wood
13ARM HEIGHT - is measured with a ruler on a right triangle.
14ARM HEIGHT - is measured to the lowest part of the arm above the center of the 200 gram mass
15ARM LENGTH - is measured from the front of the base to the point under the center of the 200 gram mass
46Place toothpicks over the plans Put glue on a toothpick and add it to 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.
52If the tower breaks before it is tested, it MUST be repaired or rebuilt for a grade to be earned.
53The diagrams, answers to the questions and the sign off sheet should be turned in before leaving school the day the tower is dueMake the diagrams BEFORE testing the tower(Just in case the tower breaks)
54Towers may be tested early to help ensure a good grade. The Tower Project is worth 150 points, but more points than this may be earnedTowers may be tested early to help ensure agood grade.Don’t wait to start working!
55Cantilever Tower Project 10.0 grams or lessMinimum arm height: 10.0 cmMinimum arm length 10.0 cm