We made a ball launcher ~ and this is the tutorial~ If you want to know more： http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/

1. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
technology workshop craft home food play outside costumes
How To Make a Ball Launcher
by slulu226 on August 16, 2015
Table of Contents
How To Make a Ball Launcher .................................................................................................... 1
Intro: How To Make a Ball Launcher ............................................................................................ 3
Step 1: Introduction ......................................................................................................... 3
Step 2: .................................................................................................................. 3
Step 3: .................................................................................................................. 4
Step 4: .................................................................................................................. 4
Step 5: .................................................................................................................. 5
Step 6: .................................................................................................................. 6
Step 7: .................................................................................................................. 7
Step 8: .................................................................................................................. 7
Step 9: .................................................................................................................. 8
Step 10: ................................................................................................................. 8
Step 11: ................................................................................................................. 8
Step 12: ................................................................................................................. 9
Step 13: ................................................................................................................. 10
Step 14: ................................................................................................................. 11
Step 15: ................................................................................................................. 11
Step 16: ................................................................................................................. 12
Step 17: ................................................................................................................. 12
Step 18: ................................................................................................................. 13
Step 19: ................................................................................................................. 13
Step 20: ................................................................................................................. 14
Step 21: ................................................................................................................. 14
Step 22: ................................................................................................................. 15
Step 23: ................................................................................................................. 15
Step 24: ................................................................................................................. 16
Step 25: ................................................................................................................. 16
Step 26: ................................................................................................................. 17
Step 27: ................................................................................................................. 17
Step 28: ................................................................................................................. 18
Step 29: ................................................................................................................. 18
Step 30: ................................................................................................................. 18
Step 31: ................................................................................................................. 19

2. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 32: ................................................................................................................. 19
Step 33: ................................................................................................................. 20
Step 34: ................................................................................................................. 20
Related Instructables ........................................................................................................ 21
Advertisements ............................................................................................................... 21
Comments ................................................................................................................ 21

3. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Intro: How To Make a Ball Launcher
This is a DIY launcher built with Makeblock suits. We used two CNC motors to drive friction wheels, of which the speed can reach 120km/h theoretically. The machine is
strong enough because of its metal framework. The maximum no-load speed of the friction wheels could be close to 10000RPM, so that please be careful in your
progress of testing.
Step 1: Introduction
Now, I will show you the details of building.
This picture shows all components you need.
Step 2:
1. Build the frame after you prepared all the part.
The picture does not include the necessary nuts and screws.

4. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 3:
The main frame is an L-shaped configuration. There is something wrong with the side beams (shown in red arrows), we didn’t notice it until we took the corresponding
picture. And it will be fixed later.
Step 4:
Two piece of right-angle connectors are installed on the rear end of the base to fix the hypotenuse of the triangle structure, which is helpful to the rest assembling.

5. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 5:
The figure of main frame

6. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 6:
Leave the screws of four corners alone when assembling the main flame, for it should be used to set foot pads. All nuts of the frame should be lock nuts, because that
this machine has a relatively severe vibration when it works.

7. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 7:
Fix the rubber foot pads on four corners of the seat after put on the screw.
Step 8:
The frame finished.

8. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 9:
Put the frame aside and begin install the friction wheel module.
Step 10:
Screw all the parts with the shaft and tighten the screw.
Step 11:
Processed the plastic rivets according to the picture.

9. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 12:
Stick to rivet and timing belt with glue. And do not tighten the headless screw before the whole machine assembled.

10. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 13:
Install another friction wheel module in the same way.

11. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 14:
Next, after you prepare the part used in friction wheel bracket.
Step 15:
Install the friction wheel module on the frame.(Restore the side beams at this time)

12. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 16:
Then, install the second friction wheel module. Please pay attention to their position.
Step 17:
Please remember to set the timing belt on the shaft when you install the friction wheel module. We forgot do that when shooting the picture above, and the figure below
shows the fixed result. The long one is installed on the topside, and the short one is downside.

13. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 18:
Then prepare all parts of motor module, and begin working.
Step 19:
Install the synchronous belt wheels firstly.

14. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 20:
Then put the timing belt wheel through the shaft, and make it together with the motor. This motor is used to install CNC drill bit, so we could assemble the shaft with the
motor easily without any coupling.
Step 21:
Install the other motor module in the same method.

15. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 22:
Next, install the motor on the main flame, and it needs two motor brackets.
Step 23:
The timing belt should be covered on the synchronous belt wheel while installing the motors. What’s more, the belt shall be as tight as possible.

16. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 24:
As we know, the motor output shaft is cantilever structure and then it would be easy shaken even damaged. To avoid this kind of tragedy, we also fix the other end of the
shaft on the frame. In this parts some bearings and some certain related components is necessary.
Step 25:
Adjust the position of the bearing carefully to make sure the tension of timing belt is appropriate. And then fix it on the thread slot.

17. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 26:
Two pairs of beams shall be added in order to increase the strength of the whole structure.
Step 27:
While installing this two double beams, you may need a helper to hold the frame.

18. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 28:
Till now, the instruction of mechanical structure is completed.
Step 29:
Next, start the installation circuit system. Weld wires on the motor first. Because the working current of the motor is bigger (about 5A), more than 1.5mm2 section of wire
is recommended. Place heat shrinkable tube on the welds, to avoid short circuit.
Step 30:
After welding wire on the good motors, please prepare two pieces of motor-speed-control boards. We could modulate the output voltage to control the motors’ speed by
the knobs on these two boards. This kind of board supports the 12V-30V input voltage, constant current can be up to 5A, and peak current can be up to 10A. In addition,
a piece of wood or acrylic board could be prepared to fix the circuit board.

19. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 31:
Install the circuit board and acrylic sheet to the frame. (Acrylic board is just to be set in the thread groove of double beams.)
Step 32:
Then make a power cord according to the power used. In this testing, we use two pieces of 3S aircraft model lithium battery, so that T joint is chosen.

20. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Step 33:
Finally, connect the power connector and the motor driver board, done!
Step 34:

21. http://www.instructables.com/id/How-To-Make-a-Ball-Launcher/
Related Instructables
How to DIY
Claw crane
Arduino-
compatible
Robot ? by
Makerworks
How to Make a
Wheel Speed
Detector by
Using a Light
Sensor. by
Makerworks
How to make a
Makeblock
Remote Control
2WD Robot by
Makerworks
How to make a
Makeblock
Small Tank with
Ultrasonic
Sensor by
Makerworks
How to make a
robot that can
play Tower of
Hanoi by
Makerworks
Robotics
Outreach for
Elementary
School
Students by
ftc4486
Advertisements
Comments
1 comments Add Comment
DIY Hacks and How Tos says: Aug 17, 2015. 6:05 AM REPLY
Cool project.