{"id":7380,"date":"2025-09-24T17:07:38","date_gmt":"2025-09-24T15:07:38","guid":{"rendered":"https:\/\/www.primalucelab.it\/blog\/?post_type=ht_kb&#038;p=7380"},"modified":"2025-09-24T17:32:52","modified_gmt":"2025-09-24T15:32:52","slug":"installing-sesto-senso-3-on-your-external-focusers-like-crayford-or-rack-and-pinion","status":"publish","type":"ht_kb","link":"https:\/\/www.primalucelab.com\/blog\/support\/installing-sesto-senso-3-on-your-external-focusers-like-crayford-or-rack-and-pinion\/","title":{"rendered":"Installing SESTO SENSO 3 on your external focusers like Crayford or Rack-and-Pinion"},"content":{"rendered":"<p style=\"text-align: justify;\">SESTO SENSO 3 is the third generation of our robotic focusing motor, designed to connect directly to the shaft of your telescope\u2019s focuser without the need for external brackets, thanks to the improved Self Centering Clamp 2 (SCC2). Unlike the previous generation, the new SCC2 supports multiple shaft diameters without the need of external adapters \u2014 25mm, 26mm, 33mm, and 37mm \u2014 allowing for faster installation and a more secure mechanical coupling with a wider range of focusers. SESTO SENSO 3 connects directly to 37mm shafts, and by using one of the included adapters, it can also connect to 25mm, 26mm, or 33mm shafts. This means you don\u2019t need to purchase additional adapters, and moving SESTO SENSO 3 between compatible instruments becomes much easier.<\/p>\n<p style=\"text-align: justify;\"><!--more--><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/5VWoFPaTcwQ?rel=0\" width=\"650\" height=\"365\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">To install SESTO SENSO 3, start by removing the manual focusing knobs from your telescope\u2019s focuser. First, remove the micrometric knob by loosening the small screw usually located on the side of the knob. Once that is done, remove the coarse knob by loosening the Allen screw that secures it. On some focusers, especially those with plastic coverings, you may need to remove the plastic housing to access the screws. Connect one of the bushings you find in the SESTO SENSO 3 box (based on the diameter that fits your focuser) to the small focuser shaft of your focuser.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7392\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1.png\" alt=\"Installing SESTO SENSO 3 on your external focuser like Crayford or Rack-and-Pinion\" width=\"1000\" height=\"650\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1.png 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1-300x195.png 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1-1024x666.png 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1-768x499.png 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1-50x33.png 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1-1536x998.png 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1-60x39.png 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-1-100x65.png 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Next, select the adapter included in the SESTO SENSO 3 box that matches your focuser\u2019s shaft diameter. If your focuser has a 37mm shaft, you won\u2019t need any adapter \u2014 SESTO SENSO 3 will connect directly. If your focuser has a 25mm, 26mm, or 33mm shaft, insert the correct adapter onto the shaft. Focusers with different diameter shaft are not supported.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7448\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b.png\" alt=\"Installing SESTO SENSO 3 on your external focuser like Crayford or Rack-and-Pinion\" width=\"1000\" height=\"734\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b.png 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b-300x220.png 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b-1024x751.png 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b-768x563.png 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b-50x37.png 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b-1536x1127.png 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b-60x44.png 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-2b-100x73.png 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">You can now connect SESTO SENSO 3 to your focuser by aligning the motor shaft with the shaft of your focuser or the installed adapter. Push SESTO SENSO 3 into position until it stops. Then, using the included Allen key, tighten the two grub screws on the front of SESTO SENSO 3 to lock its internal motor shaft to the focuser shaft.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7444\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b.png\" alt=\"Installing SESTO SENSO 3 on your external focuser like Crayford or Rack-and-Pinion\" width=\"1000\" height=\"700\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b.png 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b-300x210.png 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b-1024x717.png 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b-768x538.png 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b-50x35.png 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b-1536x1075.png 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b-60x42.png 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-3b-100x70.png 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Once the motor shaft is fixed in place, secure SESTO SENSO 3 to the focuser using the main screw on the side of the Self Centering Clamp 2.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7386\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4.png\" alt=\"Installing SESTO SENSO 3 on your external focuser like Crayford or Rack-and-Pinion\" width=\"1000\" height=\"650\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4.png 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4-300x195.png 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4-1024x666.png 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4-768x499.png 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4-50x33.png 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4-1536x998.png 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4-60x39.png 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-4-100x65.png 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Then, tighten the three smaller set screws around the clamp to ensure everything is firmly locked in place. Before powering SESTO SENSO 3 on, we recommend manually turning the focuser knob to check that the movement is uniform. It is normal for the rotation to feel stiffer than before, since the motor is now engaged, but the motion should still remain consistent. If you notice irregular movements, please repeat the installation procedure and\/or check the mechanical condition of your focuser. Your SESTO SENSO 3 installation is now complete and ready for operation.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7384\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5.png\" alt=\"Installing SESTO SENSO 3 on your external focuser like Crayford or Rack-and-Pinion\" width=\"1000\" height=\"650\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5.png 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5-300x195.png 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5-1024x666.png 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5-768x499.png 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5-50x33.png 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5-1536x998.png 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5-60x39.png 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/08\/Installing-SESTO-SENSO-3-on-your-external-focuser-like-Crayford-or-Rack-and-Pinion-5-100x65.png 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\">Please keep in mind that SESTO SENSO 3, like any focusing motor, works in conjunction with the mechanical characteristics of your focuser. Accuracy and repeatability, especially when using automatic focusing, also depend on the build quality and backlash of your focuser.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SESTO SENSO 3 is the third generation of our robotic focusing motor, designed to connect directly to the shaft of your telescope\u2019s focuser without the need for external brackets, thanks to the improved Self Centering Clamp 2 (SCC2). Unlike the previous generation, the new SCC2 supports multiple shaft diameters without&#8230;<\/p>\n","protected":false},"author":2,"featured_media":7386,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[43],"ht-kb-tag":[],"class_list":["post-7380","ht_kb","type-ht_kb","status-publish","format-standard","has-post-thumbnail","hentry","ht_kb_category-sesto-senso-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Installing SESTO SENSO 3 on your external focusers like Crayford or Rack-and-Pinion - PrimaLuceLab<\/title>\n<meta name=\"description\" content=\"Learn how to install SESTO SENSO 3 robotic focusing motor on your external focusers like Crayford or Rack-and-Pinion\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.primalucelab.com\/blog\/support\/installing-sesto-senso-3-on-your-external-focusers-like-crayford-or-rack-and-pinion\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Installing SESTO SENSO 3 on your external focusers like Crayford or Rack-and-Pinion - 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