{"id":135,"date":"2018-04-10T10:52:00","date_gmt":"2018-04-10T08:52:00","guid":{"rendered":"https:\/\/lefablabdudon.wordpress.com\/?p=135"},"modified":"2021-08-15T18:16:06","modified_gmt":"2021-08-15T16:16:06","slug":"projet-larret-durgence-deporte","status":"publish","type":"post","link":"https:\/\/fablabdudon.bzh\/index.php\/2018\/04\/10\/projet-larret-durgence-deporte\/","title":{"rendered":"Projet : l\u2019arr\u00eat d\u2019urgence d\u00e9port\u00e9"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">La probl\u00e9matique<\/h1>\n\n\n\n<p>Quand on pilote une CNC, il faut rester \u00e0 proximit\u00e9 du bouton d\u2019arr\u00eat d\u2019urgence. On peut se retrouver facilement dans une situation d\u2019urgence o\u00f9 il faut arr\u00eater d\u2019alimenter des moteurs qui forcent ou un broche coinc\u00e9e ou un mat\u00e9riau qui se d\u00e9tache. Le sympt\u00f4me est parfois celui d\u2019une machine qui appelle au secours dans de d\u00e9chirants cris de \u00ab&nbsp;pas qui sautent&nbsp;\u00bb ou de fraise \u00e0 l\u2019agonie. Les incidents potentiels ne manquent pas :<\/p>\n\n\n\n<ul><li>Ordre donn\u00e9 \u00e0 la machine d\u2019aller au-del\u00e0 de ses dimensions physiques.<\/li><li>Ordre de p\u00e9n\u00e9tration ou de d\u00e9coupe trop rapide pour le type de fraise et le mat\u00e9riau concern\u00e9.<\/li><li>Blocage de la broche qui ne peut plus assurer de d\u00e9placement \u00ab&nbsp;\u00e0 l\u2019int\u00e9rieur&nbsp;\u00bb du mat\u00e9riau.<\/li><li>Perte d\u2019adh\u00e9rence ou de fixation du mat\u00e9riau qui menace d\u2019\u00eatre projet\u00e9.<\/li><li>Mauvais r\u00e9glage de profondeur de coupe avec l\u2019outil qui attaque le martyr.<\/li><li>Chauffe du mat\u00e9riau qui menace de s\u2019enflammer.<\/li><li>Bris de la fraise.<\/li><\/ul>\n\n\n\n<p>Et on peut y ajouter les probl\u00e8mes sp\u00e9cifiques aux lasers, \u00e9videmment.<\/p>\n\n\n\n<p>Quand la CNC est de petite dimension, si on est proche de la machine, on est proche du bouton d\u2019arr\u00eat qui coupe l\u2019alimentation de la broche et des moteurs.<\/p>\n\n\n\n<p>Quand la table de travail fait 1 m\u00e8tre sur 1,50 m\u00e8tre, le probl\u00e8me est plus d\u00e9licat si on se trouve du mauvais cot\u00e9. A moins d\u2019avoir un bras de plus d\u2019un m\u00e8tre de long, ce qui n\u2019est pas le plus courant.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Les solutions<\/h1>\n\n\n\n<p>Une solution simple est de poser un bouton d\u2019arr\u00eat d\u2019urgence aux 4 coins de la table. On les connecte en s\u00e9rie. Si l\u2019un est d\u00e9clench\u00e9, tout s\u2019arr\u00eate.<\/p>\n\n\n\n<p>Une autre solution plus \u00ab&nbsp;geek&nbsp;\u00bb est de disposer d\u2019un bouton d\u2019arr\u00eat d\u2019urgence mobile. On le garde pr\u00e8s de soi, m\u00eame si on s\u2019\u00e9loigne un peu de la machine. En cas de besoin, on appuie sur le bouton et on commande \u00e0 distance l\u2019arr\u00eat d\u2019urgence.<\/p>\n\n\n\n<p>Bien \u00e9videmment, c\u2019est cette derni\u00e8re solution qui a \u00e9t\u00e9 retenue pour ce projet.<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">La solution<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Premi\u00e8re approche<\/h2>\n\n\n\n<p>Pour communiquer, le FabLab dispose du mat\u00e9riel et de quelques comp\u00e9tences autour du NodeMCU, qui est une petite carte programmable disposant de capacit\u00e9s WiFi.<\/p>\n\n\n\n<p>Il faut 2 dispositifs (dont 2 NodeMCU) :<\/p>\n\n\n\n<ol><li>Un boitier r\u00e9cepteur comportant une carte NodeMCU, une entr\u00e9e d\u2019alimentation secteur (230 V AC), une sortie d\u2019alimentation command\u00e9e, vers les moteurs et la broche, un transformateur pour alimenter le carte, un dispositif de commande de courant fort (relais ou \u00e9lectronique). Le module se comporte comme un Point d\u2019Acc\u00e8s WiFi.<\/li><li>Un boitier \u00e9metteur comportant une carte NodeMCU, un bouton d\u2019arr\u00eat d\u2019urgence, une batterie. Le module se comportant comme client WiFi du point d\u2019acc\u00e8s.<\/li><\/ol>\n\n\n\n<p>Le point d\u2019acc\u00e8s peut recevoir plusieurs connexions permettant de mettre en ouvre plusieurs boutons d\u2019arr\u00eat d\u2019urgence en m\u00eame temps.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Programmation<\/h2>\n\n\n\n<p>R\u00e9daction en cours<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Plan de c\u00e2blage<\/h2>\n\n\n\n<p>R\u00e9daction en cours<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9alisation mat\u00e9rielle<\/h2>\n\n\n\n<p>R\u00e9daction en cours<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La probl\u00e9matique Quand on pilote une CNC, il faut rester \u00e0 proximit\u00e9 du bouton d\u2019arr\u00eat d\u2019urgence. On peut se retrouver facilement dans une situation d\u2019urgence o\u00f9 il faut arr\u00eater d\u2019alimenter des moteurs qui forcent ou un broche coinc\u00e9e ou un mat\u00e9riau qui se d\u00e9tache. Le sympt\u00f4me est parfois celui d\u2019une machine qui appelle au secours [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/posts\/135"}],"collection":[{"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/comments?post=135"}],"version-history":[{"count":3,"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/posts\/135\/revisions"}],"predecessor-version":[{"id":617,"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/posts\/135\/revisions\/617"}],"wp:attachment":[{"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/media?parent=135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/categories?post=135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fablabdudon.bzh\/index.php\/wp-json\/wp\/v2\/tags?post=135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}