Boomerang yog riam phom ntawm Australian aborigines, uas, tom qab muab pov yog qhov tseeb, rov qab mus rau tus tswv txhais tes, tau piav qhia ntau zaus hauv cov ntawv xov xwm thiab qhia hauv TV. Koj tuaj yeem ua qhov yooj yim no hauv tsev, tsuas yog muaj cov cuab yeej zoo thiab qee lub sijhawm pub dawb.
Nws yog qhov tsim nyog
- - ib daim ntawv tuab tuab;
- - ib daim plywood;
- - ntaub ntawv tiaj tus;
- - jigsaw;
- - kua nplaum.
Cov Lus Qhia
Kauj ruam 1
Kos kab ntawv cim ua ntej. Ntawm daim ntawv tuab ntawm cov ntawv tuab, kos cov duab plaub fab nrog ib sab ntawm 50 hli thiab hloov pauv ntawm qhov boomerang mus rau lawv. Sim ua kom nws ua kom xwm yeem - thaum ntxiv kev kos raws OA kab, lub xub pwg ntawm boomerang yuav tsum sib phim.
Kauj ruam 2
Tom qab ntawd nqa ib daim plywood thiab siv cov kua roj hmab kua nplaum los txuas cov ntawv txiav qauv kom cov khaubncaws sab nraud ntawm cov plywood sib tshooj rau OA kab. Tom qab ntawd siv ib kab hluav taws xob txiav txiav txiav boomerang raws tus qauv npaj.
Kauj ruam 3
Kev siv lub vernier caliper thiab cov ntaub ntawv tiaj tus, ua haujlwm ib sab ntawm lub workpiece kom plywood thickness maj txo los ntawm nruab nrab mus rau qhov xaus. Tsuas yog ib sab tau ua tiav, lwm qhov yuav tsum nyob twj ywm.
Kauj ruam 4
Tom ntej no los txog theem tseem ceeb tshaj plaws - profiling. Los ntawm tin los yog nyias cov plywood, raws li cov duab kos, txiav tawm cov qauv cuav rau txhua ntu. Tom qab ntawv nqa cov ntawv ntim ua semicircular lossis tiaj tus, tsim qhov saum npoo thiab xuab zeb nws. Sau cov npoo ntse. Them nyiaj tshwj xeeb rau kev tuav lub xub pwg nyom ntawm lub neej yav tom ntej boomerang, vim hais tias nws cov noog zoo yuav nyob ntawm nws.
Kauj ruam 5
Kuaj tshuaj npaum li cas ntxiv ntawm boomerang. Txhawm rau ua qhov no, dai nws los ntawm nruab nrab (raws OA axis) thiab pom tias yog ib qho ntawm nws lub xub pwg outweighs. Yog tias ib lub xub pwg hnyav dua lwm qhov, nws tsim nyog los txheeb xyuas qhov ua rau thiab kho qhov tsis haum.
Kauj Ruam 6
Ntawm qhov kawg ntawm kev ua haujlwm, thaum txhua sab tau sib npaug, koj tuaj yeem sim lub boomerang. Txhawm rau kom cov khoom ci, npog nrog xim thiab siv tus qauv zoo nkauj.
