This is my first instructable so its not the greatest thing.Leave a comment so I can improve.
The Robot in this instructable was a participant in the Ontario Technological Skills Competition Robotics Team of Four built by a bunch of grade 12 high school students with no previous experience in robotics. As the title suggest the robot is based on the design of a forklift. The purpose was to create an engineering project to encourage individuals with different skill sets to form cooperative teams to design, fabricate and operate a robot. It was expected of us to use some newly purchased and recycled parts or components (motors, gears, etc.) to fabricate a robot consisting of mechanisms which would allow it to complete the simple task of picking up wooden cubes with dimensions 3.5 by 3.5 by 3.5 inches and dropping the cubes in a bin with diameter of 36 inches and height of 18 inches.Apart from the motors and the electrical system everything else was designed and built from scratch.
Step 1: Task
Our assigned task was to pick up wooden cubes with dimensions 3.5 by 3.5 by 3.5 inches and to drop them in a bin with diameter of 36 inches and height of 18 inches.
Step 2: Parts Needed
One of : 2.4 GHZ Spektrum AR6000 DSM DuaLink 6-Channel Park Flyer Receiver
One of : Spektrum DX6 DSM 6CH Park Flyer System
One of : Sabertooth Dual 25A Motor Driver
Two of : HM-50 Waterproof Marine ESC Electric Speed Controller for R/C Model Boats (50A)
Two of : Scooter Motor 12Volts120W, DC Motor.
One of : 12V Brushless Motor
One of : 12volts 50watts Windshield Wiper Motor to be used as a winch
Two of : 15 amp 32 volts fuse
Aircraft wire rope
Scrap pieces of wood
Two of : Small Tires.
Two of : Trolley wheels(shopping cart wheels)
Step 3: Design and Measurements : Sides
Cut out two pieces of wood with the following measurements for the sides.
Step 4: Design and Measurements : Top
The measurements for the top piece of wood.
Step 5: Mounting the Wheels
Gears were welded on to the Wheels.
Step 6: Mounting the Body
For the Body of the robot we decided to use the concept of a 3 dimensional jigsaw puzzle where we created slots and perfectly fitting parts cut out of wood.
Step 7: The Rails and Lift System
For a demonstration of the lift system while in the building process :
Drawer slides were used as rails for the lift.
As for the DIY Winch, a 12volts 50watts Windshield Wiper Motor was used with 2 metal disks welded on the shaft of the motor so that the aircraft wire rope could warp around.
Step 8: The Arm
Step 9: The Gripper Unit
The threaded rod was drilled and the Motor shaft was inserted in the hole which was secured by cold weld.
The threaded rod passes through a nut which is secured inside the piece of wood.
When the motor is turned on, the threaded rod spins making the piece of wood move.
Step 10: Wiring Schematic
All the Positive Wires were connected to the Battery in Parallel.
All the Negative Wires were connected to the Battery in Parallel.
Here is a link to help with the wiring of the Sabertooth dual 25A motor driver :
We soldered a 1N4004 Diode to a push switch which connected to the gripper motor. Whenever the piece of wood would move back to drop the cube, it would make contact with the switch shutting the motor off.This was only done to facilitate our completion of the task.
Step 11: Wiring
Wiring for the Sabertooth :
- Wire with the Blue tip connects to the Positive Terminal of the 12V Battery.
- The Wire on the Right side of the Blue tip connects to the Negative Terminal of the 12V Battery.
- Here is a link to better understand the wiring :