TAILIEUCHUNG - Building Robots Part 6

76 Full Height Units One-Third Units CHAPTER 4. LEGO DESIGN Horizontal Units 1 3 5 6 8 2 1 0 2 1 2 4 6 8 10 Bracing LEGO structures using the perfect vertical spacings is a key method of creating a structurally sturdy machine. LEGO Gearing Making a good LEGO geartrain is indeed a ne art. However, this art can be learned, and having some simple information can make a big di erence. One of the rst things to notice about LEGO gears is their diameter, which indicates at what spacings they can be meshed together. The natural units for the sizes of LEGO gears is the horizontal. | 76 CHAPTER 4. LEGO DESIGN Full Height Units V One-Third Units Horizontal Units 1 2 2 3 1 4 5 0 6 6 2 8 8 1 10 Bracing LEGO structures using the perfect vertical spacings is a key method of creating a structurally sturdy machine. LEGO Gearing Making a good LEGO geartrain is indeed a fine art. However this art can be learned and having some simple information can make a big difference. One of the Erst things to notice about LEGO gears is their diameter which indicates at what spacings they can be meshed together. The natural units for the sizes of LEGO gears is the horizontal LEGO spacing unit. The following table shows the radii of the various LEGO gears Gear Teeth number Gear Radius horizontal units 8 16 1 24 40 Notice that three of the gears namely the 8-tooth 24-tooth and 40-tooth have radii that when used together in pairs an integral spacing is formed. So for example the 8-tooth gear may be used with the 24-tooth or the 40-tooth but not the 16-tooth. Figure shows how an 8-tooth gear would mesh with a 24-tooth gear along a LEGO beam. The 16-tooth gears only mesh with each other according to this logic. Gears may be meshed together at odd diagonals. However this requires great care as it is difficult to achieve a spacing that is close enough to the optimal spacing which can be computed by adding the gears radii . If the gears are too close they will bind or operate with high frictional loss if they are too far they will slip. . LEGO GEARING 77 Figure Meshing of an 8-Tooth Gear and a 24-Tooth Gear Figure Diagonal Meshing of an 8-Tooth Gear and a 16-Tooth Gear Figure Diagonal Meshing of a 16-Tooth Gear and a 24-Tooth Gear 78 CHAPTER 4. LEGO DESIGN Figures and show examples of diagonal gearing that have been tested to work well. Other combinations that have good performance may be discovered. A very high performance geartrain will be necessary in order to drive a robot. For this type of geartrain the following rules are .

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