Medieval Chalenge Catapult

Catapult

In the context of a project at the MakerSpace of UniLaSalle Amiens, we designed, prototyped, and built a mini siege machine intended to take part in a game where the goal is to score as many points as possible by aiming at specific game elements.

For more information about the Medieval Challenge: https://makerspace-amiens.fr/medieval-challenge

Required Equipment

To build this catapult, you will need:

• A 3D printer

• A laser cutter

Bill of Materials (BOM)

Filaments

• Rosa3D PLA – Black

• Rosa3D PLA – White

3D Printed Parts

• 1× Body

• 1× Barrel support

• 1× vertical support columns

• 1× Shaft

• 1× Rail cover

• 1× M5 key

• 1× Foot 1

• 1× Foot 2

• 1× Foot 3

• 1x M6 support

• M6 Key

Laser-Cut Parts

• 1× Base plate (laser-cut plywood or MDF)

• 1x circular base plate

• 4× Feet plates

(Material recommended: 5 mm (je sais pas comment ca s’appelle)

Non-Printed / Standard Parts

• 2× M5 × 30 mm screw

• 1x M6 x 30mm screw

• M6 nut

• 2× M3 × 10 mm flat head screws

• 1× Ø3 × 50 mm pin

• 5x M3 threaded insert

• 5x M3x10mm flat head screws

• 2x M4 x 30mm screw

• 1x M4 x 50 threaded rod

• ~30 cm rope

• ~100 mm of 2mm elastic band

• 1x M4 x 20mm screw

• Nerf Rival foam ball

Assembly Instructions

1.    Insert the M3 threaded inserts into foots 1, 2, and 3

2.   Insert the M3 threaded insert into M6 support

3.   Insert the m4 threaded insert into foot support

4.   Screw the M5×30 screw into the shaft.

5.   Laser cut the circular base plate and the four feet plates.  Fix the laser-cut feet in the circular base plate.

6.   Screw the M6 support onto the square base using the two M3 × 10 mm flat head screws.

7.   Assemble it with the circular base using the M6×30 mm screw and the M6 nut held in place by the M6 support.

8.    Insert the vertical support columns into the foot supports.

9.    Install the foot 1, 2 and 3 with M3 screw and foot support on her to stiffen the structure.

10.   Screw the foot support on barrel support using M4x 20mm screw

11.   Mount the body onto the barrel support using the threaded rod and two nuts.

12.   Add the rail cover on the rail.

13.   Tighten and adjust the elastic band.

14.   Check alignment and perform test launches.