Robot Building for Beginners, Third Edition

CHAPTER 17 ■ DC MOTORS Odd Gear Ratios Gear ratios rarely reduce exactly to the lowest term. This isn’t bad luck; it’s by design ...

APPENDIX B ■ APPENDIX B Or, take a cylinder and subtract two rectangular boxes (cuboids) and you have a slot for the Lego cross ...

CHAPTER 17 ■ DC MOTORS The gear attached to the motor shaft has 12 teeth and it meshes with a larger gear that has 28 teeth. Tha ...

APPENDIX B ■ APPENDIX B All combined, start with a cylinder and subtract boxes, cylinders, and cones to create the coupler. See ...

CHAPTER 17 ■ DC MOTORS Stacking layers of planetary gears builds a full gearbox (see Figure 17-29). Just like a spur gearbox, th ...

APPENDIX B ■ APPENDIX B Preparing to Print The editable model files are in a proprietary format for each modeling tool. To print ...

CHAPTER 17 ■ DC MOTORS Moving Forward Hopefully you’ve now been exposed to enough information about DC brush and gearhead motors ...

APPENDIX B ■ APPENDIX B Finishing the Coupler The cross axle slot on the printed coupler is the right shape and a tight enough f ...

CHAPTER 18 Adding Gearhead Motors In this chapter, we will select and install motors in the line-following robot circuit. You’ll ...

APPENDIX B ■ APPENDIX B The finished coupler, with the set screw and cross axle, is shown in Figure B-12. Printing a 3D Wheel Wh ...

CHAPTER 18 ■ ADDING GEARHEAD MOTORS Since speed decreases linearly with voltage, the 9 V RPM can be estimated as: (RPM nominal / ...

APPENDIX B ■ APPENDIX B The set screw is tapped, installed, and tightened through a hole in the rim (see Figure B-15). Alternati ...

CHAPTER 18 ■ ADDING GEARHEAD MOTORS The Solarbotics motors aren’t the same shape and size as the Hsiang Neng motors. Therefore, ...

APPENDIX B ■ APPENDIX B Unfortunately, the silicon rubber doesn’t grip nearly as well as standard rubber tires. So, I tried Plas ...

CHAPTER 18 ■ ADDING GEARHEAD MOTORS Determining the Least Current (Best Case) The no-load current of the selected motor (after a ...

APPENDIX B ■ APPENDIX B The outer dimensions of the original Lego hub were measured using a digital caliper. Figure B-19 shows h ...

CHAPTER 18 ■ ADDING GEARHEAD MOTORS Determining the Actual Current (Average Case) The average current of the motor is going to b ...

APPENDIX B ■ APPENDIX B As a 3D model becomes more complicated, you need to be decisive of the order in which shapes are added o ...

CHAPTER 18 ■ ADDING GEARHEAD MOTORS Most diodes physically resemble resistors, but without the multiple color bands (see Figure  ...

APPENDIX B ■ APPENDIX B Compared to a leftover sandwich container, the 3D printed cover has several disadvantages. First, the 3D ...