Introduction: 4 Jumbo Wheel Robot

Picture of 4 Jumbo Wheel Robot

A fun four jumbo wheel robot that is able to carry a sufficient amount of weight while moving in a hypersonic speed.

Step 1: Base

Picture of Base

Create the base using 4 Chassis rails,15-hole angle bar, and a Chassis bumper. Use 8 screws and 8 keps nuts to tighten the rails.

Step 2: Motors

Picture of Motors

Place 2 Bearing Blocks on the 7th square hole fron the back of the robot of each side of the 2nd and 3rd Chassis rail, then add 2 motor modules.

Step 3: Gear

Picture of Gear

After builting the block bearing, insert 4 square bars into the middle hole of each block bearing. Then enter a 64 tooth gear into the square bar attached to the motor on each side and enter a 36 tooth gear to the other square bar.

Step 4: Wheels

Picture of Wheels

After putting in the square bars, you then add the wheels to the long square roots( the one's not attached to the motor). You'd also add 2 jumbo wheels next to the jumbo wheel .( Neither of them are attached to the motor.

Step 5: VEX Controller

Picture of VEX Controller

After adding the wheels, you then add the VEX Controller. Attach a 10 hole bar to the 2nd and 3rd Chassis rail using 2 screws and 2 keps nuts. After attaching the bar, you then attach the VEX Controller to the bar using another pair of 2 screws and keps nuts.

Step 6: Adding Power

Picture of Adding Power

This step is very simple. All you do is attach the end of the battery to the positive\negative input of the the VEX Controller. (We dont have a battery holder so we just left it on one of the rails.)

Step 7: Attaching Motors

Picture of Attaching Motors

This step is also very simple . All you do is attach the red and black wires from the motor to the VEX Controller motor input.( one of the wires gets attached to 1 while the other goes to 10)

Step 8: Sled Holder

Picture of Sled Holder

Attach a 5 hole angular bar to the slanted end of base using 2 screws and keps nuts. Than attach the 9 hole bar to the 1st hole of the angular bar.(Use a screw and a keps nut).

Step 9: Building a Sled

Picture of Building a Sled

To build a sled, you 1st you need a flat plate, you then get 4 flat bearing and attach them to the 4 corners of the flat plate using 2 spacers, 2 long screws, and 2 keps nuts for each side. You also need to attach 2 of the 5 inch axle in two open holes around the middle of the flat plate.( they are the places where you'd put your weight on).

Step 10: Attaching the Sled

Picture of Attaching the Sled

This is the most basic step. All you do is screw the side of the sled to the 9 hole bar using 4 screws and keps nuts. Than screw a gusset to the 15 hole angular bar and screw the 9 hole bar to the end of the gusset.

Step 11: Final Product

Picture of Final Product

Step 12: Materials

4 Chassis rails
1 15 hole angular bar
1 10 hole angular bar
1 Chassis bumper
2 64 tooth gear
2 36 tooth gear
10 block bearings.
4 Jumbo wheels
2 motors
1 Vex Controller
1 battery
1 gusset
1 9 hole bar
1 flat plate
2 5inch axles
4 flat bearings
Around 44 Screws and keps nuts.
16 spacers
6 square bars
6 collars

Step 13: Tools

Picture of Tools

small hex wrench
big hex wrench

Step 14: Gear Ratio

our gear ratio is 36:60
we chose this because we felt that it best suited our robot.
the input RPM is 110 while the output is 183.7
input torque is 1.67 N*M
output torque is 1 N*M

Step 15: Wheel Size

actual speed is 3.3
theoritical speed is 2.8

Step 16: Design Iteration

Picture of Design Iteration

check our notebook.


tomatoskins (author)2015-06-10

I'm liking all these robots that I've seen posted!

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