{"id":2589,"date":"2017-06-20T10:50:10","date_gmt":"2017-06-20T08:50:10","guid":{"rendered":"http:\/\/gap47.astrosurf.com\/?page_id=2589"},"modified":"2019-12-19T16:45:28","modified_gmt":"2019-12-19T14:45:28","slug":"our-machines-at-gap-47","status":"publish","type":"page","link":"https:\/\/gap47.astrosurf.com\/index.php\/our-machines-at-gap-47\/","title":{"rendered":"Our machines at GAP47"},"content":{"rendered":"<p><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">The first machine used by GAP47 was made when we had to polish our 20&prime; mirror in 1992. The aim was to go through that phase of the work without excessive efforts, while retaining the characteristics and advantages of handwork (by limiting the defects coming from the repetitivity of mechanical movements). The principle that was chosen then was to opt for a pantograph which would increase muscular power.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-2322\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image026.jpg\" alt=\"\" width=\"800\" height=\"351\" srcset=\"https:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image026.jpg 667w, https:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image026-300x132.jpg 300w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">The pantograph&rsquo;s arms are linked to one another by pin articulations. O<\/span><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">ne end consists in a fixed pivot <strong>(3) <\/strong>. At the far end of the pantograph there is a handle <strong>(1) <\/strong>and a small wheel that may be rolled over a small table <strong>(2) <\/strong>. At the central articulation of the device there is a drive pin <\/span><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">which transmits the movements to the lap. It is impossible to use this system with the mirror on top. The revolving table (supporting the mirror) is run by a 220v AC motor coming from an old supermarket cash desk conveyor belt. The speed of the mirror is 10 rpm and cannot be changed. There is a pedal to keep the motor running.<\/span><\/p>\n<div style=\"width: 500px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-2589-1\" width=\"500\" height=\"444\" loop autoplay preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/panto.mp4?_=1\" \/><a href=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/panto.mp4\">http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/panto.mp4<\/a><\/video><\/div>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">The second machine built at GAP47 is more recent (2006). It is an off-set Hindle-type machine with a double crank system. It will be used for the polishing of our current project of a 16&prime; mirror, and, as far as possible, for its figuring. Here are the principles that were paramount in its building&nbsp;:<\/span><\/p>\n<ul>\n<li><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">Two cranks with adjustable width, permitting a large choice of strokes.<\/span><\/li>\n<li><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">DC motors to prevent electric risks in wet surroundings. Moreover, these motors have variable torque thus contributing to a breach of coordination when the surfaces stick to each other. Besides, their rotation speed may be modified through simple changes in the electric tension. The drive arm can be lifted and its length is adjustable.<\/span><\/li>\n<li><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">One motor is dedicated to each rotation movement (the machine has three motors) in order to avoid the periodicity created by a single motor, connected through belts and spindles.<\/span><\/li>\n<li><span style=\"font-family: times new roman,times,serif; font-size: 20px;\">Its volume is reduced and some features make the machine able to be easily stored away (the motor blocks may be simply detached) or even be used for other purposes (the table and the rotating plate are at the same height so that the machine can be used as an ordinary table).<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 20px; font-family: arial,helvetica,sans-serif;\"><strong>Building an offset Draper-type polishing machine<\/strong><\/span><\/p>\n<table style=\"width: 795px;\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\" align=\"center\">\n<tbody>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3487 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image002-1.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3488 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image012.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3489 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image022.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3490 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image032.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<\/tr>\n<tr align=\"center\" valign=\"top\">\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p class=\"Style2\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">For a start : a half-forgotten workbench at the back of a garage .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p class=\"Style2\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">The turn-table is sawn off from the table top (on second thought, the 410mm diameter is a little too small).<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\">\n<p class=\"Style2\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> A second layer of plywood is glued to the turn-table to make it more rigid . <\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"><span class=\"Style2\">The side of the turn-table is aligned with the help of a lathe (not really indispensable)<\/span>.<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3491\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image004-1.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3492\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image014.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3493\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image024.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3494\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image034.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<\/tr>\n<tr class=\"Style2\" valign=\"top\">\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">The turn-table fitted with a DC motor with its speed reducer<br \/>\n<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 378.55px;\" colspan=\"2\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> The two motor sets (12v DC motors from washing-machines) and their speed reducers (from the scrap yard). Their final speeds are 11 rpm and 9 rpm, respectively . <\/span><\/em><\/span><\/p>\n<\/div>\n<div align=\"center\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">&nbsp;<\/span><\/em><\/span><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">The motor sets are independent blocks that can be easily separated from the rest of the machine .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3495\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image006.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3496\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image016.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3497\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image026-1.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3498\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image036.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<\/tr>\n<tr class=\"Style2\" valign=\"top\">\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> The turn-table speed reducer is screwed to a round plywood base .<br \/>\n<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> Five screw threads are fixed to the table-top around the opening, from under . <\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> The round plywood base is bolted to the underside of the table-top. Three little wheels are set at 120\u00b0 angles . <\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">The turn-table is fitted to the reducer&rsquo;s axle, in contact with the wheels. The height of the turn-table is adjusted thanks to the 5 screw threads .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3499\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image008.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3500\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image018.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3501\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image028.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3502\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image038.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<\/tr>\n<tr class=\"Style2\" valign=\"top\">\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> The metal sides and top of the work bench are opened for access .<br \/>\n<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">The different supports are placed into position in order to accommodate the top<\/span><\/em><\/span><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> The table-top is fixed to the supports together with its motor base for the turn-table . <\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">The motor blocks are screwed to the table top (using a screw thread as a rotating axle) .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3503\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image010-1.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3504\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image020.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3505\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image030.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3506\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image040.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<\/tr>\n<tr class=\"Style2\" valign=\"top\">\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> Crank number 1 with its adjustable crankpin .<\/span><\/em><\/span><\/p>\n<p>&nbsp;<\/p>\n<\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> Crank number 2 with a teflon sliding-shaft holder fixed to the crankpin (the crankpin is adjustable) . <\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\"> The arm of the tool-holder device can be lifted. It is of adjustable length. One can see the vertical tool-driving pin .<br \/>\n<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">At the crank number 1 end of the link bar (connecting the two crank shafts) we find a spherical joint .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3507 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image042.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3508 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image044.jpg\" alt=\"\" width=\"180\" height=\"120\"><\/span><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3510 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image046.jpg\" alt=\"\" width=\"180\" height=\"120\"><\/span><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3509 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image048.jpg\" alt=\"\" width=\"180\" height=\"120\"><\/span><\/div>\n<\/td>\n<\/tr>\n<tr class=\"Style2\" valign=\"top\">\n<td style=\"width: 170px; text-align: center;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">On the link bar a stop is set that sustains the arm of the tool-holder device (to avoid possible shocks of the pin against the mirror) .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 170px; text-align: center;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Electrical connections of the motors .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 208.55px; text-align: center;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Front panel with a switch for each motor .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 194.45px; text-align: center;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">The power is provided by an accumulator (two batteries connected in series or in parallel depending on the speed needed).<br \/>\n<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 743px;\" colspan=\"4\" height=\"27\">\n<p class=\"Style1\" align=\"center\"><span style=\"font-family: arial,helvetica,sans-serif; font-size: 20px;\"><strong>Accessories and various late improvements<\/strong><\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3511 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image050.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3512 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image055.jpg\" alt=\"\" width=\"180\" height=\"135\"><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3513 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image054.jpg\" alt=\"\" width=\"180\" height=\"120\"><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3514 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image058.jpg\" alt=\"\" width=\"180\" height=\"120\"><\/div>\n<\/td>\n<\/tr>\n<tr class=\"Style2\" valign=\"top\">\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Bearings for the crank axles to relieve the strains on the speed reducers&rsquo; bearings .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Small hand-crank for an easy adjustment of the offset crank<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Rack on the arm of the tool-holder device to adjust the length of the offset effect.<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\">\n<p><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Greater diameter of the turn-table together with adjustable 120\u00b0 side-holders .<\/span><\/em><\/span><\/p>\n<\/div>\n<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3515 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image057.jpg\" alt=\"\" width=\"180\" height=\"135\"><\/span><\/div>\n<\/td>\n<td style=\"width: 170px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3517 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image052.jpg\" alt=\"\" width=\"180\" height=\"134\"><\/span><\/div>\n<\/td>\n<td style=\"width: 208.55px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3516 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image056.jpg\" alt=\"\" width=\"180\" height=\"120\"><\/span><\/div>\n<\/td>\n<td style=\"width: 194.45px;\">\n<div align=\"center\"><span style=\"font-size: 20px;\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3518 aligncenter\" src=\"http:\/\/gap47.astrosurf.com\/wp-content\/uploads\/2017\/06\/image060.jpg\" alt=\"\" width=\"180\" height=\"120\"><\/span><\/div>\n<\/td>\n<\/tr>\n<tr class=\"Style2\" valign=\"top\">\n<td style=\"width: 170px;\">\n<p align=\"center\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Round tray with a socket to hold the mirror when working with mirror on top .<\/span><\/em><\/span><\/p>\n<\/td>\n<td style=\"width: 170px;\">\n<p align=\"center\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Adjustable electric transformer (from 0V to 30V) for the right crank motor .<\/span><\/em><\/span><\/p>\n<\/td>\n<td style=\"width: 208.55px;\">\n<p align=\"center\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Graduations for a precise adjustment of the cranks.<\/span><\/em><\/span><\/p>\n<\/td>\n<td style=\"width: 194.45px;\">\n<p align=\"center\"><span style=\"font-size: 20px;\"><em><span style=\"font-family: times new roman,times,serif;\">Graduation for the adjustment of the offset effect arm.<br \/>\n<\/span><\/em><\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The first machine used by GAP47 was made when we had to polish our 20&prime; mirror in 1992. The aim was to go through that phase of the work without excessive efforts, while retaining the characteristics and advantages of handwork (by limiting the defects coming from the repetitivity of mechanical movements). The principle that was &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/gap47.astrosurf.com\/index.php\/our-machines-at-gap-47\/\" class=\"more-link\">Continuer la lecture<span class=\"screen-reader-text\"> de &laquo;&nbsp;Our machines at GAP47&nbsp;&raquo;<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-2589","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Our machines at GAP47 - L&#039;observatoire est ouvert aux visiteurs tous les vendredis soirs \u00e0 21 heures, jusqu&#039;au 3 juillet 2026 inclus, sans r\u00e9servation.<\/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:\/\/gap47.astrosurf.com\/index.php\/our-machines-at-gap-47\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Our machines at GAP47 - L&#039;observatoire est ouvert aux visiteurs tous les vendredis soirs \u00e0 21 heures, jusqu&#039;au 3 juillet 2026 inclus, sans r\u00e9servation.\" \/>\n<meta property=\"og:description\" content=\"The first machine used by GAP47 was made when we had to polish our 20&prime; mirror in 1992. The aim was to go through that phase of the work without excessive efforts, while retaining the characteristics and advantages of handwork (by limiting the defects coming from the repetitivity of mechanical movements). 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