{"id":251,"date":"2014-04-02T08:49:14","date_gmt":"2014-04-02T07:49:14","guid":{"rendered":"http:\/\/arwann.com\/?page_id=251"},"modified":"2015-05-08T10:32:52","modified_gmt":"2015-05-08T09:32:52","slug":"la-mortaise","status":"publish","type":"page","link":"http:\/\/arwann.com\/?page_id=251","title":{"rendered":"La mortaise"},"content":{"rendered":"

\"bouton<\/a>Par Lama. Le coin des scouts<\/a> -> Forestage et installations<\/a><\/p>\n

Percer une mortaise avec une tari\u00e8re n\u2019est pas tr\u00e8s difficile mais il faut faire attention \u00e0 quelques r\u00e8gles. (Aller voir la page des outils<\/a>) R\u00e9p\u00e9tons que la tari\u00e8re doit \u00eatre aiguis\u00e9e<\/span>, avoir une vrille en bon<\/span> \u00e9tat et poss\u00e9der un manche ad\u00e9quat<\/span>.<\/p>\n

1)<\/strong> En g\u00e9n\u00e9ral il faut percer un trou d\u2019un diam\u00e8tre compris \"coin<\/a><\/strong>entre 30% et 40% de celui du rondin. \u00a0On peut percer un peu plus grand dans certains cas. On pourrait percer plus petit mais c\u2019est le tenon qui deviendrait trop fr\u00eale.<\/p>\n

\n\n\n\n\t\n\n\t\n\t
\u01feRondin ->
\n\u01feTari\u00e8re\t<\/th>		60<\/th>70<\/th>80<\/th>90<\/th>100<\/th>\n<\/tr>\n<\/thead>\n
30% mini<\/td>18<\/td>20<\/td>24<\/td>28<\/td>30<\/td>\n<\/tr>\n
40% maxi<\/td>24<\/td>28<\/td>32<\/td>36<\/td>40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/p>\n

2)<\/strong> En g\u00e9n\u00e9ral on perce au centre du diam\u00e8tre et perpendiculairement aux fibres du bois. On peut percer en biais ou m\u00eame au bout du rondin dans le m\u00eame sens que les fibres mais c\u2019est bien plus difficile et le r\u00e9sultat est al\u00e9atoire.<\/p>\n

3)<\/strong> Il faut bien choisir l\u2019endroit o\u00f9 percer la mortaise surtout lorsqu\u2019elle se trouve en bout de rondin. Le risque d\u2019\u00e9clater les fibres au moment d\u2019enfoncer le tenon est important. \"coin<\/a>Certains bois r\u00e9sistent bien au fendage mais d\u2019autres \u00e9clatent tr\u00e8s facilement. Pour un bois qui se fend facilement on \u00e9loignera les mortaises de l\u2019extr\u00e9mit\u00e9. Une distance de 2 fois le diam\u00e8tre du rondin semble suffisante. Si le bois r\u00e9siste bien au fendage ou s\u2019il se trouve un n\u0153ud entre la mortaise et l\u2019extr\u00e9mit\u00e9, on peut descendre \u00e0 1,5 fois le diam\u00e8tre.<\/p>\n

4)<\/strong> Il faut s\u2019appliquer \u00e0 percer bien dans l\u2019axe. Si on perce de guingois, le r\u00e9sultat final en \"mortaise<\/a>p\u00e2tira et le r\u00e9sultat risque de d\u00e9cevoir. Si toutes les mortaises sont perc\u00e9es de travers il sera assez difficile de r\u00e9aliser une construction droite. Il faut se faire aider par des \u00ab\u00a0viseurs\u00a0\u00bb au d\u00e9marrage du per\u00e7age. Une fois la vrille bien engag\u00e9e et les premiers copeaux \u00e9ject\u00e9s on peut continuer sans aide.<\/p>\n

5)<\/strong> Il faut sur\u00e9lever le rondin que l\u2019on perce avant de faire d\u00e9boucher la vrille, sinon celle-ci va mordre la terre ou les cailloux. Pas terrible\u00a0!<\/p>\n

6)<\/strong> Enfin on fera attention de ne pas \u00e9clater les derni\u00e8res fibres au d\u00e9bouch\u00e9 de la vrille. \u00c0 \"mortaise\"<\/a>la fin du per\u00e7age, la vrille qui est sortie, ne tire plus la tari\u00e8re. Et ces derni\u00e8res fibres ne peuvent plus \u00eatre coup\u00e9es. Si on continue d\u2019appuyer, on va simplement les plier ou les d\u00e9laminer. Il est pr\u00e9f\u00e9rable d\u2019arr\u00eater le per\u00e7age et de retourner le rondin pour percer dans l\u2019autre sens\u00a0; la vrille ne tire plus mais les couteaux peuvent couper les fibres restantes sans risquer de les d\u00e9laminer. On peut aussi finir au couteau en respectant le sens des fibres.<\/p>\n

page pr\u00e9c\u00e9dente : le tenon<\/a><\/em>
\npage suivante : mettre un coin dans un tenon<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Par Lama. Le coin des scouts -> Forestage et installations Percer une mortaise avec une tari\u00e8re n\u2019est pas tr\u00e8s difficile mais il faut faire attention \u00e0 quelques r\u00e8gles. (Aller voir la page des outils) R\u00e9p\u00e9tons que la tari\u00e8re doit \u00eatre aiguis\u00e9e, avoir une vrille en bon \u00e9tat et poss\u00e9der un manche ad\u00e9quat. 1) En g\u00e9n\u00e9ral … Continuer la lecture de La mortaise<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":121,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-251","page","type-page","status-publish","hentry"],"yoast_head":"\nLa mortaise -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/arwann.com\/?page_id=251\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La mortaise -\" \/>\n<meta property=\"og:description\" content=\"Par Lama. 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