The MOBOT Project: Longwood
In modern engineering, a systematic approach is used in the design, operation, and construction of an object to reach a desired goal. The first step of the process employs what is commonly known as the scientific method. The next step involves forming an interdisciplinary team of specialists from not only the various engineering disciplines, but from other fields whose knowledge may be useful or even necessary to completing the project. This step doesn't apply to our project, due the confined nature of the class. Finally, considerations must be taken into account to ensure that the project is efficient as well as cost effective.
The goal of the MOBOT Project was to design and build a programmable robot. The robot had to complete a series of four movements in four given directions over a distance of at least 6 inches. Power and weight restrictions were applied to ensure the safety of the students and, more importantly, the teacher. As the goals of the project were made clearer, our group began discussing possible ideas for the design. There were some disagreements about whether we should take the electromechanical route or the purely electrical one.
And after some deep thought, we all agreed that the mechanical way would be the simplest to build and the most merciful on our pocketbooks. Even though we were coming up with some good ideas, each design seemed to contain some major problems. One of the reoccurring problems dealt with the synchronization of the driver motor and the steering system. Finally the team came up with a design that allowed the drive and steering controls to be independent of one another, but still allowing each one to be linked in time. This design has now become what is known as LONGWOOD.
The Longwood is divided into two main parts: 1)motion system and 2)logic board. As the engineer, I was responsible for motion design. Therefore, that will be the focus for the remainder of this section.
The main components of the motion system consist of a platform, three wheels, a wheel frame, two motors, and two contact switches. Two of the wheels were connected to a motor and attached at the front end of the platform. These wheels were only allowed to move simultaneously in either a forward or reverse direction. The third wheel was hooked up to the wheel frame and free to rotate approximately 45 degrees in either direction. Figure 1.1 shows an illustration of how the wheel frame works. The wheel frame and third wheel were then attached to the platform completing the basic assembly.
o The secondary clutch is mounted on the end of the jackshaft (which connects to the drive shaft via a chain and gears).
Remove the 18mm bell housing bolt. There will be 4 easily accessible from the top with 3.1, 5 with 3.8. Next install the holding fixture with two hooks to support the engine while the trans is removed. This is a large frame like device that has two hooks that support the engine from above while major components have been removed from below. Raise and support the vehicle.
Gears are one of the oldest equipment known to mankind. They can be traced back to The Chinese South-Pointing Chariot in the 27th century B.C created by Ma Jun a mechanical engineer. The earliest explanation of gears was that the “direction of rotation is reversed when one gear wheel drives another gear wheel”- Aristotle in the 4th century. As well as Greek engineers used gears in clocks and water wheels. (2010 Ronson Gears)Early gears were made from wood, they were used in wind to decrease and increase the rotational speed .Gear manufacturing and design rapidly developed through the nineteenth century.( 2014 eFunda, Inc.)
Specifically, on a standard five speed, the gears are as follows: Neutral is located in the middle of the panel. From neutral, gears must be changed accordingly. First gear is found to the far upper left, and is used to get the car moving from a stopped position. Down left is second gear, used for speeds up to twenty-five miles per hour. Third gear is located upper middle of the panel, used for speeds from about twenty-five to forty miles per hour. Fourth gear is found at the lower middle and would be good for between forty and fifty miles per hour. Fifth gear is found to the far upper right, and is used for higher driving speeds such as on the freeway. Last but not least is reverse, which is to the far bottom right, used for backing up. These gears must be maneuvered the exact same way each time the automobile is driven.
The high point of this research came with the completion of his own self-propelled vehicle, the Quadricycle. This bike had four wire wheels and was steered with a tiller, like a boat. It had two forward speeds, and no reverse. Although this was not the first self-propelled vehicle, it set Henry Ford as one of the major pioneers whom helped this nation become one of motorists (Head 22 - 24).
Tires are thrown from tires because the centrifugal force expels snow, rocks, and other foreign objects.
The roots of the machine go back to at least the fifth century B.C. in China. In its most primitive form, it consisted of a pivoted beam with a sling at one end and ropes at the other. A stone would be placed in the sling and a team of men would haul the ropes, swinging the beam up into the air”1.
pistol. He got it from watching the wheel and that the spokes came back in line with the wheel.
The Wheel symbolizes the balance of life as it is all in constant motion. This balance is expressed through
A direct current in a set of windings creates a polar magnetic field. A torque acts on the rotor due to its relation to the external magnetic field. Just as the magnetic field of the rotor becomes fully aligned with the external magnetic field, the direction of the current in the windings on the armature reverses, thereby reversing the polarity of the rotor's electromagnetic field. A torque is once again exerted on the rotor, and it continues spinning.
is connected to a shaft, which spins a disc. The disc has holes in it
The important thing to know about an object that is moving on wheels is that its kinetic energy is equal to half of its mass including the wheels(Mb) multiplied by the square of its velocity(V) plus the kinetic energy in the rotating wheels. In this case I am going to assume that all of the mass of the wheels is located on the outer edge (this isn't really the case, but most of the mass is there). Then the kinetic energy of a wheel due to rotation is half of its mass(Mw) multiplied by the square of its radius(r) multiplied by the square of its angular velocity(w) multiplied by two since there are two wheels.
system of interrelated parts that are interdependent of one another. If a change in one part takes
...m wooden peg legs and hooks to synthetic arms that can move on their own due to movement impulses from their brain.