Today we make a trigger/lock mechanism for a rather powerful crossbow, would also work for BB guns though.
Both of my BB guns use this design. And here we go:
Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.
Step 1: Templates, Material and Tools
- Dremel rotary tool + cutting wheel
- Jig saw or small metal saw
- Pair of pliers
- 5mm Alu plate (scrap metal or wood), for a stronger bow, alu or brass
- 2-3mm Alu (for the base plate and cover)
- Tension-spring (appr. 20mm, 0.5 to 0.8mm wire-thickness
- 4x 5-8mm screws (2 holding the spring and 2 as stoppers) M3 will do
- 5x 12mm screw (for mounting the 2 trigger parts plus cover-plate)
- 6mm plastic spacers (or metaltubing, scrap-wood or whatever)
- M3 nuts
Step 2: Instructional-video and Fabrication-steps
1. Print 2 baseplates and the other 2 parts on paper, then use a scissor to cut them out
2. Transfer the outlines to the metal, then mark+drill holes (3mm for M3) and saw out the 4 parts as shown
3. Attach the tension-spring as shown
4. Screw in the stopper-screws
5. All other screws into the flipped coverplate, spacers on, make sure the 2 lock parts are where they belong
6. Screw on the M3 nuts, check if there is enough room for smooth operation, and its done.