{"id":654,"date":"2013-05-25T22:19:07","date_gmt":"2013-05-25T20:19:07","guid":{"rendered":"http:\/\/reperes-astro.fr\/?p=654"},"modified":"2025-02-01T14:03:00","modified_gmt":"2025-02-01T13:03:00","slug":"la-construction-du-strock-250-de-reperes-episode-1","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/la-construction-du-strock-250-de-reperes-episode-1\/","title":{"rendered":"La construction du Strock 250 de Rep\u00e8res &#8211; Episode 1"},"content":{"rendered":"\n<p>Depuis quelques mois, nous parlions au sein de l&rsquo;association de nous lancer dans la construction d&rsquo;un ou de plusieurs dobsons de voyage. Apr\u00e8s quelques h\u00e9sitations, mais surtout gr\u00e2ce \u00e0 des rencontres utiles et encourageantes lors des RAC et des RAP, nous nous sommes finalement lanc\u00e9s dans l&rsquo;aventure.<\/p>\n\n\n\n<p>Nous pensions au d\u00e9part construire 6 Strocks 250 simultan\u00e9ment, puisque nous sommes 6 membres du club int\u00e9ress\u00e9s par cette aventure. Finalement, devant les difficult\u00e9s d&rsquo;organisation et surtout de disponibilit\u00e9 des uns et des autres, nous avons d\u00e9cid\u00e9 d&rsquo;en construire un premier en commun, et ensuite, de r\u00e9utiliser le savoir-faire acquis pour construire les 5 autres plus rapidement et plus efficacement.<\/p>\n\n\n\n<p>Premi\u00e8re apr\u00e8s-midi de travail, consacr\u00e9e \u00e0 la constitution d&rsquo;un dossier complet pour chaque participant (gr\u00e2ce \u00e0 toutes les informations donn\u00e9es <a href=\"http:\/\/strock.pi.r2.3.14159.free.fr\/Ast\/Strock-250.html\" target=\"_blank\" rel=\"noopener\">sur le site de Pierre Strock<\/a>), au choix du miroir primaire, et au d\u00e9but du travail sur les haches.<\/p>\n\n\n\n<p>En ce qui concerne le miroir, nous n&rsquo;avons pas r\u00e9ussi \u00e0 trouver un miroir qui corresponde aux cotes utilis\u00e9es par Pierre Strock. Pour le moment, le mieux que nous ayons trouv\u00e9 est un <a href=\"http:\/\/www.teleskop-express.de\/shop\/product_info.php\/info\/p5197_TS-Newton-Primary-254mm-f4-7---Pyrex-with-Zygo-Test-Report.html\" target=\"_blank\" rel=\"noopener\">254 F\/D-4,7<\/a> de chez Telescope Express qui fait 32mm d&rsquo;\u00e9paisseur aux bords et p\u00e8se 3,3 kg. La focale \u00e9tant un peu plus courte, nous devrons raccourcir les tubes carbone du serrurier. Ce sont surtout les 32mm qui nous g\u00eanent (au lieu des 27 pr\u00e9conis\u00e9es sur les plans) mais en parcourant les discussions sur les forums astrosurf et webastro, il semble que ce soit jouable avec 32mm. Nous avons trouv\u00e9 un <a href=\"http:\/\/www.teleskop-express.de\/shop\/product_info.php\/info\/p2864_Orion-Optics-UK-primary---250-1200mm---f-4-8---1-6-Lambda.html\" target=\"_blank\" rel=\"noopener\">Orion Optics<\/a> \u00e0 F\/d=5 qui fait 29mm, mais il est tr\u00e8s cher et il semble que la qualit\u00e9 soit al\u00e9atoire.<\/p>\n\n\n\n<p>Pour les haches, nous avons utilis\u00e9 une d\u00e9fonceuse sur du contreplaqu\u00e9 marine de 10mm. Nous avons \u00e9videmment commis la b\u00eatise de d\u00e9couper le cercle des deux haches avant de faire les trac\u00e9s de d\u00e9coupe sur le dit cercle. Or, certains trac\u00e9s en arc de cercle ont un centre en dehors de du disque d\u00e9coup\u00e9. Nous avons de ce fait perdu pas mal de temps pour tout tracer correctement. Le bon protocole est le suivant :<\/p>\n\n\n\n<p>1) tracer sur le contreplaqu\u00e9 les cercles et l&rsquo;ensemble des figures n\u00e9cessaires \u00e0 la d\u00e9coupe des haches et des jours dans les haches.<\/p>\n\n\n\n<p>2) d\u00e9couper \u00e0 la d\u00e9fonceuse ou \u00e0 la scie \u00e0 chantourner les jours \u00e0 l&rsquo;int\u00e9rieur du disque<\/p>\n\n\n\n<p>3) d\u00e9couper le cercle (compos\u00e9 des deux haches) lui-m\u00eame.<\/p>\n\n\n\n<p>Bilan : une bonne journ\u00e9e pour lancer le projet dob de voyage, prendre connaissance des \u00e9tapes de la construction, prendre en main les outils et faire nos premi\u00e8res erreurs. Mais bilan positif puisque nous avons nos haches d\u00e9coup\u00e9es correctement. Nous pouvons donc passer \u00e0 l&rsquo;\u00e9tape suivante.<\/p>\n\n\n\n\t\t<style>\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 50%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in %77%70%2d%69%6e%63%6c%75%64%65%73\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-654 gallery-columns-2 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100084.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100084-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100084-150x150.jpg 150w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100084-80x80.jpg 80w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100084-320x320.jpg 320w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100097.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100097-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100097-150x150.jpg 150w, 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https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100096-320x320.jpg 320w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100090.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100090-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100090-150x150.jpg 150w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100090-80x80.jpg 80w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100090-320x320.jpg 320w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt><\/dl><br 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href='https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100075.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100075-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100075-150x150.jpg 150w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100075-80x80.jpg 80w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100075-320x320.jpg 320w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2013\/05\/P1100080.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" 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class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Depuis quelques mois, nous parlions au sein de l&rsquo;association de nous lancer dans la construction d&rsquo;un ou de plusieurs dobsons de&#46;&#46;&#46;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_654\" class=\"pvc_stats all  \" data-element-id=\"654\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":6,"featured_media":655,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[104,102,115],"tags":[],"class_list":["post-654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archives-reperes-astro-2013","category-archives-reperes-astro","category-travaux-bricolages"],"yoast_head":"<title>La construction du Strock 250 de Rep\u00e8res - Episode 1 - Rep\u00e8res Astro<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/reperes-astro.fr\/la-construction-du-strock-250-de-reperes-episode-1\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La construction du Strock 250 de Rep\u00e8res - Episode 1 - 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