This is a spring loaded dart made of common items found in my local hardware store. My son and I saw something similar to this on a National Geographic special about the Chinese weapons. I don't remember what they actually called it, but from what I remember it was considered to be an assassin weapon. A low powered spring loaded dart that was typically dipped in poison. The weapon was easily concealed, and powerful enough to break the skin which in turn administered the poison. My version will shoot about 35 feet. I imagine that if I put a tip on the dart it would travel further due to aerodynamics.
Step 1: Material and Tools
1 - Shut off valve with chrome sleeve
1 - Short length of 1/2" copper tubing (2-3/4" long)
1 - 1/2" copper cap
1 - Strike plate
1 - Washer #10 I think
2 - Set screws 6-32 thread 1/8" long
1 - Length of aluminum solid tube 1/4" diameter
2 - Springs (#11 at my hardware store)
2 - Bronze bushing (5/8"O.D. 1/2" I.D.)
2 - Bronze bushing (1/2"O.D. 3/8" I.D.) Not pictured sorry
2 - Bronze bushing (3/8"O.D. 1/4" I.D.)
1 - tube of Locktite
Step 2: Construction Begins
Then I took the bronze bearings and slid them inside each other to make 1 long bearing with 5/8" O.D. and 1/4" I.D. I slid this bearing inside the chrome tube and soldered in place at the end of the tube.
Step 3: Working on the Copper Tubing
Solder on 1/2" copper cap to one end of the tubing.
slide copper tubing into the Chrome sleeve and tape it in place.
Drill a small hole 1/4" from the edge of the chrome sleeve going through both side of the chrome sleeve and the copper tubing.
Remove the copper tube from the chrome sleeve, and set the chrome sleeve to the side.
Using a dremel I cut an L shaped groove on both sides of the copper tubing.
The groove is 1-7/8" long with a 1/4" leg (Which creates the L shape) cut towards the where the cap is located. Then I filed the grooves smooth.
Step 4: More Work on the Chrom Tube
2- On the opposite end of th chrome tube where the bronze bearings are drill a 1/16" hole through the chrome sleve 1/2" from the edge. Then I used a dremel to wide the wide the hole. The overall dimensions of the hole are 1/8" X 3/8". This hole will be used for the triger assembly.
Step 5: Trigger Assembly
Step 6: The Springs
I kept 1 spring full length and I cut one down to make the total of 3".
On the full length spring I soldered on a Flat washer and a little piece of metal to fill the hole in the washer. I placed the springs into the copper tube, and then inserted it into the chrome sleeve. Once the copper tube was inserted into the sleeve I locked into place with the set set screws. I used locktite to prevent them the set screws form backing out.
Step 7: The Bolt
I used the dremel to cut a 1/16" groove into the bolt. the groove was cut 1/2" back from the front of the bolt. I chose not to put a point onto the bolt for safety reasons, but it could easily be done.
Step 8: How to Load and Fire
2 - Put the bolt into the chrome sleve.
3 - Once the bolt is in the chrome sleeve lock it into place with the trigger assembly.
4 - Push the copper tube back into the chrome sleeve and turn it to lock it into place against the set screws.
5 - Point it away from people and animals.
6 - Push down on the trigger and watch the bolt fly.
No... Seriously watch it fly. My son and I spent 30 minutes looking for a bolt because we didn't see where it landed.
This is potentially dangerous; please use caution if you decide to build one of these. I am not liable for any injuries or accidents that may as a result of building one.