{"id":10426,"date":"2023-06-11T14:24:39","date_gmt":"2023-06-11T14:24:39","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/t400-modifications-de-structure-1-2\/"},"modified":"2025-06-08T22:44:14","modified_gmt":"2025-06-08T20:44:14","slug":"t400-modifications-de-structure-1-2","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/t400-modifications-de-structure-1-2\/","title":{"rendered":"T400 – Modifications de structure (1) (2)"},"content":{"rendered":"

J’ai des doutes sur la tenue m\u00e9canique de mon 400 et je vais lui faire un petit lifting par \u00e9tapes.<\/p>\n

1\u00b0 La cage centrale et primaire
\nIl s’agit d’un newton ouvert du style truss
\nL’ancien propri\u00e9taire n’avait pas triangul\u00e9 les \u00e9l\u00e9ments de montage.
\nTout en gardant les cadres d’origine, j’ai essay\u00e9 de trianguler quelque peu.
\nVoici quelques photos des travaux:
\n–\tDes caissons en bois pour assurer le parall\u00e9lisme des cadres
\n–\tDes barres de triangulation (dans la mesure du possible) en alu.<\/p>\n

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2\u00b0 Le support primaire.
\nJ’avais opt\u00e9 l’ann\u00e9e pass\u00e9e pour un support ouvert \u00e0 6 points. Suivant les calculs Plop, c’est suffisant.
\nJ’en suis finalement venu \u00e0 un support \u00e0 18 points.
\nA partir du support \u00e0 6 points, j’ai gard\u00e9 les 3 branches principales (fuchsia),
\net les barres de support des 6 points (vert).
\nEnfin voici les nouveaux supports triangulaires sur base d’anneaux avec des ergots \u00e0 120\u00b0 (rouge) qui tous ensemble donneront les 18 points.
\nLes anneaux sont mont\u00e9s sur des supports pivotants \u00e0 boule.
\nLes anneaux en soi proviennent de pieds de d\u00e9rouleurs d’essuie-tout reconvertis.<\/p>\n

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Voici un essai sur M13.<\/p>\n

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Le fond de ciel n\u2019est pas uniforme ; il y a des flux parasites, qu’il va falloir g\u00e9rer.
\nL’\u00e9tape suivant consistera \u00e0 modifier les tubes (truss) pour la connexion de la cage sup\u00e9rieure. Et probablement de refaire une cage sup\u00e9rieure.<\/p>\n

Alexandre
\n2023-06-02
\nD400, F 2237mm
\nPas de correcteur de coma
\nASI 1600 mono, gain unitaire
\nPas de filtre; le spectre total y compris les IR est captur\u00e9.
\nPoses de 1s; il y a probablement 600 images empil\u00e9es
\nImages prises en Bin 1×1: R\u00e9solution ~0.35Arcsec\/pixel
\nNiveaux, l\u00e9g\u00e8re d\u00e9convolution.
\nImage finale r\u00e9duite de 50%: R\u00e9solution ~0.70Arcsec\/pixel<\/p>\n\n\n

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\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

J’ai des doutes sur la tenue m\u00e9canique de mon 400 et je vais lui faire un petit lifting par \u00e9tapes. 1\u00b0 La cage centrale et primaire Il s’agit d’un newton ouvert du style truss L’ancien propri\u00e9taire n’avait pas triangul\u00e9 les \u00e9l\u00e9ments de montage. Tout en gardant les cadres d’origine, j’ai essay\u00e9 de trianguler quelque peu. […]<\/p>\n","protected":false},"author":16,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-10426","post","type-post","status-publish","format-standard","hentry","category-astrobricolage"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10426","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=10426"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10426\/revisions"}],"predecessor-version":[{"id":11262,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10426\/revisions\/11262"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}