Friction fire - "cane tubular fire saw" (bow drill, tubular drill)

[luth47]

Pas mal. J'ai testé sans succès un système proche en rotation manuelle directe mais sans encoche sur la planchette juste de petites ouvertures sur le côté de la drille pour espérer amener de l'air et obtenir la braise à l'intérieur. (ensuite il faut voir l'utilité du truc...pluie peut être :) encore faut il que cela fonctionne...

Je vais reprendre le truc avec archet et en retenant votre idée de la petite pierre au sommet, c’est malin ça.

[freejutube]

@luth47

J'avais commencé aussi sans encoche, hésitant à percer le tube pour l'apport d'oxygène, imaginant que chaleur et braise se concentreraient à l'intérieur du tube. En fait le frottement a eu lieu sur le pourtour extérieur du tube et la poussière sortait vers l'extérieur : pas de frottement sur la surface intérieure du tube et pratiquement pas de poussière à l'intérieur (?! cas particulier ?).

[luth47]

@freejutube

je ne sais pas...c’est peut être moi qui ai eu de la chance car de mémoire il y avait de la sciure à l'intérieur.

[crunksknunk]

Great proof of concept. You can also fill the cane with sand and drill through stone with it. The combination of silica (naturally present in cane/bamboo) and the sand acts as an abrasive.

[freejutube]

@crunksknunk

Thanks ! Drilling through stone with bamboo will be on my list of experiments. I think I've read somewhere that neolithic chinese may have drilled through jade with big diameter bamboo to make beautiful cylindrical vases that we can see in some exhibition. Seems incredible. One of the trick was to know where to find garnet sand or sand with sufficient hardness.

[kitsurubami]

nice! i read that for hollow tip spindles, the apex of the notch should be at the outer ring of burning, not the center of circle. Don't know where you put your notch, couldn't tell. Hollow tips are interesting because on one hand you're getting significantly more pressure without losing speed, but you may also gain a large amount of drag from the plug your cookie cutter spindle makes.

[freejutube]

@kitsurubami

I find (again) a paper saying that on survivalschool : Articles / Fire_Making / notch_construction. Actually, my notch was just only breaking the wall of the burn, exactly as is shown in the figures at the end of the article. But I didn't bother to prolong the indentation under the board (maybe it was not useful, as the board was a round branch and the outer wall of the burn was 1mm close the bark surface).

[kitsurubami]

@freejutube ahh yeah, same article. haha. you were probably the one who pointed me to it originally. sorry for that.

[freejutube]

@kitsurubami

yes... but I've just found another article that seems really excellent "FIRE MAKING APPARATUS IN THE UNITED STATES NATIONAL MUSEUM" (1928). I've read only a few pages till now, but looks like super promising !! (htttttp : // si-pddr.si.edu / jspui / bitstream / 10088 / 15753 / 1 / USNMP-73_2735_1928.pdf)

[kitsurubami]

@freejutube oh! this is a good read. i'm only 11 pages in, but it's very captivating. Thank you for the link.