this link is great for illustrating the preoccess for making darts:

http://www.geocities.com/blowgunhunter/

instead of using dowels, one may try
-bamboo skewers, a little on the light side, but still pretty effective
-bike spokes, if you can find them, you can sharpen the tips on a file, or pound them out into spear tips
-for "stun darts" you can stick a toothpic into a cotton ball, and glue them in or tie them on with some thread
-i have read an account where some people used clay or play dough plugs for a nighttime hunt of eachother

you don't need to soak the cones in super glue, either, you can just tape them on with scotch tape or clear packing tape.  this is what i do, as i act as though i will only be using my basic darts once or twice, and then possibly losing them during a hunt.  for my hunting darts, i do the super glue soaky thingie, and tie a bit of red yarn around the shaft to make them easier to locate, and so i can easily identify wich kind of dart i am taking from my quiver(a papertowel tube with a bit of a cereal box taped to the bottom).  exacto blades can get pricy, so what i do sometimes is get little picture hanging nails that are laying around and pound them out, then sharpen them with a file.

ah ha!  what a good idea!  as  i understand it, you mean the blades that come in "utility knives", that snap off to reveal a fresh, sharper section of blade.  that is genius!  i never though of using those far less expensive, but just as good blades for this purpose.

well either way, i previously only used blades that were too dull for real use anymore, but those could still easily tear through flesh.  from now on, i will use this method.

Also, wouldn't those blades be in the shape of a parallelogram (shown below):

     _______________
    /                                                                                                                      /
   /                                                                                                                                /
  /                                                                                                                           /
/______________ /

So wouldn't you have to somehow cut them or saw them or break them diagonally to get two triangular dart tips?

Altay, I'm fairly sure that you could just snap them with pliers... no saws necesary.

Bookmark!!!!!

Hello.
I use PVC pipes ( 16mm and 20mm. 16mm is put inside
the 20mm) as a blowgun.
For darts I use mostly bamboo skewer with a paper cone. For making the paper cone stiffer I normaly put
white glue all around the cone.
For making hunting broadheads I normaly use old
screws that I warm read hot (or yellow) and hammer flat. Shape it with a file and attach to the bamboo skewer.
You can also use a coat hanger and just hammer the tip of the hanger flat and then grind (file) it.

Pizza boxes with newspaper folded up in them make great blowgun targets, just so you know.