Introduction: "The Teazer" Knex Semi-Automatic Rubber Band Gun (RBG)
The Teazer will hold 4-7 rubber bands and will shoot them one at a time. I spent 2 weeks trying to perfect the trigger mechanism that would fire only 1 shot each time you pull the trigger. I finally got it. The handle may be too big for small hands, and you may need to shorten or extend the barrel to fit your ammo better, but I'm very happy with the trigger assembly. I was quite detailed with my instructions, as I've often been frustrated by vague instructables, and ones that skip steps.
EXOTIC PIECES: The only pieces that might be a little rare are the little black dudes in step 4.
This is my first instructable.
Rev. Tie Dye
PS: I recommend you check out the trigger mechanism in MrRadicalEd's RBG repeater. I like it better than mine. It's simpler and works better. What more could you ask?
I designed a rugged pistol that fires little 2-inch RB's. Much better than the Teazer: Gunzo The Great
Step 1: Trigger Assembly
Pic 1 - Build 2 of these
Pic 2 - Add these pieces...
Pic 3 - ...as shown here
Pic 4 - Add the third layer (you may need to temporarily remove the piece indicated by the pen)
cut a piece of duct tape 1/4" wide (8mm) it must be less than 5/8" (10mm)
length is not crucial, about 2-1/2" (65mm) should do.
Pic 5 - Stick the tape as close to the grey connectors as possible
Pic 6 - Wrap it up like this
Step 2: The Spinner
Pic 1 - Use these pieces...
Pic 2 - to make this (the other brown piece is underneath).
Step 3: The Handle
This handle is kind of funky, and may be too big for small hands. Sorry.
Pic 1 - Make these pieces, then put them together the obvious way with the lone green piece last.
Pic 2 - Like this
Pic 3 - Make 4 sets like this
Pic 4 - On layers 2-5, attach the red corners to the blue rods, then connect all the greens. Layer 6 is like layer 1.
Pic 5 - Finished handle.
Step 4: The Nose
Pic 1 - Six yellows here
Pic 2 - If you don't have these black pieces, you might be able to use 2 straight orange connectors (but I haven't tried it).
Step 5: The Sides
Make 2 of these
Step 6: Through-Rods
Use the 4 pieces on the left to make the one on the right
(Actually, you need to make two of these through-rods)
Step 7: Putting It Together
Pic 1 - Attach 3 blue rods and slide the THROUGH-RODS (previous step) through as shown.
Pic 2 - Add wheel as shown, and 2 blue spacers on forward yellow rod
Pic 3 - Add Trigger assembly and 1 blue spacer.
Pic 4 - Add blue and silver spacers on front blue rods (number 2 and 3 from the sesame street counting).
Pic 5 - Add the opposite side piece.
1st - slide over yellow through-rods
2nd - slide over blue axle
3rd Snap in the 3 blue rods, starting at the back
Pic 6 - Add 2 brown connectors to the ends of the yellow through-rods
Step 8: Finishing Touches
Pic 1 - Add Nose assembly as shown
Pic 2 - Add 2 more blue cross pieces to the bottom of the barrel (note the rubber band around the rear one.
Pic 3 - Attach handle as shown
Pic 4 - Add 2 more blue cross pieces for strength with optional spacers.
Pic 5 - Loop rubber band around trigger.
Step 9: Loading the Ammo
I'm using rubber bands that are about 7 inches long. I also added one extra segment to the barrel, of my gun to make it fit these rubber bands better.
Pic 1 - Loop ammo band around black tips
Pic 2 - Stretch Rubber Band around front upright pin of white spinner wheel.
Pic 3 - [to COCK the Gun] Pull back on the wheel while pulling the trigger.
It might take a few times before you get used to doing this.
If you're feeling frustrated, pull just a little bit harder.
Pic 4 - Now the Rubber Band is on the back pin, and you can load another rubber band on the front pin, and cock again. Repeat as many times as you can, until the tension is getting too much.
Depending on where exactly you place the RB on the white pin, the gun may fire when you pull the trigger, or when you release it, after pulling.