Parts:

sliders, casters of different kind, ball-bearings, Thrust bearings, Spur gears, pulleys, cables, valve-tube(spring system),Hinges, Rivet machine for joining the parts, Lock nut.

 

Motors:

DC Motors:
we use so called Johnson’s motors with driving current rating ranging from 800mA to 1.5A, for the purpose of mechanical assembly driving, which is usually mounted on the main driving base for the bot.

For the driving of the bots we have used 20,000 coil RPM Japanese Motors, with Gear reduction of ranging from 200 to 800 RPM. The Gear reduction for the motors requires separate gear box attachments for the motors shaft. The level of gear reduction we use depends on the amount of torque we need for that specific task. The level of precision and speed requirements is also considered. 

Servo motors:
For applications where the load is to be rapidly accelerated or decelerated frequently, the electrical and mechanical time constants of the motor plays an important role. Servo motors are designed for a great level of precision in position control, velocity control and torque control. These motors are special in the following ways:

1. Lower mechanical time constant.
2. Lower electrical time constant.
3. Permanent magnet of high flux density to generate the field.
4. Fail-safe electro-mechanical brakes.

 

Mechanisms:

In almost all of the autonomous machines, it is very important for the machine to have knowledge of the surroundings to maintain a dynamic stability in its tasks. This is done by taking a continuous feedback of the surroundings in the manner, what is called as a servomechanism. A servomechanism is an automatic device which uses error-sensing feedback to correct the performance of a mechanism. The device takes feedback or error-correction signals which help in controlling mechanical position or other parameters.

 

Software for designing, modeling and simulating mechanisms:

This time we used Solid Works to simulate some of our mechanisms .And we also used other CAD softwares at different stages of progress like 3ds Max.

 

Robocon 2008 bot's description:

Manual bot: We used normal permanent magnet D.C. motors for driving the bot. Bot also has the shifting mechanism (using spur gear, chain, bearings, shaft) which could shift the bot perpendicular to the direction of motion at the same time which implies Bot can move in X and Y axis at the same time i.e. it can move in straight line, parabola and other curves depending upon the feed given by the driver. For lifting the pot we had used 4 bar linkage parallelogram mechanism.