{"id":19882,"date":"2019-07-16T00:00:00","date_gmt":"2019-07-16T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/snack-zustellmaschine-teil-1-mechanik\/"},"modified":"2026-09-14T22:06:47","modified_gmt":"2026-09-14T22:06:47","slug":"snack-zustellmaschine-teil-1-mechanik","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/de\/blog\/dev-life\/snack-zustellmaschine-teil-1-mechanik\/","title":{"rendered":"Snack-Zustellmaschine: Teil 1, die Mechanik"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Hacking on hardware is always fun, and\u00a0<a href=\"https:\/\/www.mailgun.com\/de\/blog\/mission-to-mars-pycon-2014\" target=\"_tabs\" rel=\"noopener noreferrer\">it\u2019s been a while<\/a>\u00a0since we\u2019ve created something! In this brief series of blog posts, we are going to make an email controlled snack machine using a dry-food dispenser, a Raspberry Pi, a pair of stepper motors, and a little bit of 3D printing.<\/p>\n\n<p class=\"wp-block-paragraph\">This post is going to concentrate on the mechanics first, and then we\u2019ll continue to electronics in part two.<\/p>\n\n<p class=\"wp-block-paragraph\">Ready? Let\u2019s go!<\/p>\n\r\n    <nav data-content-type=\"longform\" class=\"toc-block longform-spacings px-5 py-6 px-md-6 px-lg-7 py-md-7 bg-light fs-sm rounded-lg\" aria-labelledby=\"toc-title-3271\"><p class=\"h5 m-0\" id=\"toc-title-3271\">Inhaltsverzeichnis<\/p><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">01<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#prepping-the-components\">Prepping the components<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">02<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#figuring-out-the-powertrain\">Figuring out the powertrain<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">03<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#making-everything-better-with-a-dremel\">Making everything better with a Dremel<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">04<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#final-assembly\">Final assembly<\/a><\/div><\/div><div class=\"d-flex mt-3\"><div class=\"w-auto fw-bold text-accent d-flex me-2\">05<\/div><div class=\"d-flex flex-column\"><a class=\"fw-bold scrollme link-body-color text-accent\" href=\"#pretty-cool-right\">Pretty cool, right?<\/a><\/div><\/div><\/nav>\n<h2 class=\"wp-block-heading\">Prepping the components<\/h2>\n\n<p class=\"wp-block-paragraph\">We started with a snack dispenser that you can find at any department store or online. If you\u2019re curious about where we got ours, we got it off of\u00a0<a href=\"https:\/\/www.amazon.com\/gp\/product\/B00013K8OO\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Amazon<\/a>.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-3997\" width=\"700\" height=\"1244\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_init-700x1244-1.png\" alt=\"Picture of a snack dispenser\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_init-700x1244-1.png 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_init-700x1244-1-169x300.png 169w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_init-700x1244-1-576x1024.png 576w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">It\u2019s a pretty simple machine: the goodies load in from the top and you can turn the handle to dispense them to a bowl underneath. But what if we attach motors to the dispensing mechanism? Enter, the motors \u2014 aka two 12V NEMA-17 steppers. We used a pair of\u00a0<a href=\"https:\/\/www.adafruit.com\/product\/324\" target=\"_tabs\" rel=\"noopener noreferrer\">these<\/a>, but learned the hard way that the machine can benefit from a little bit more torque than 0.2Nm.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4009\" width=\"700\" height=\"525\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/324-03-700x525-1.jpg\" alt=\"Picture of two motors called 12V NEMA-17 steppers\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/324-03-700x525-1.jpg 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/324-03-700x525-1-300x225.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">These little guys were perfectly sized (length 34mm), and fit snugly inside the dispensers.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4011\" width=\"1024\" height=\"576\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_profile.png\" alt=\"A picture showing the motors attached to the snack dispenser\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_profile.png 1024w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_profile-300x169.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dispenser_profile-768x432.png 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">Figuring out the powertrain<\/h2>\n\n<p class=\"wp-block-paragraph\">In our machine, the dispense knob had a \u201cflat-milled\u201d shaft that gets inserted into the piece with rubber flaps. The motor was also flat-milled, but the problem was that the diameter of the motor shaft was much smaller.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4024\" width=\"700\" height=\"661\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/csm_D-Cut_a38a54ae43-700x661-1.jpg\" alt=\"Picture of a motor shaft\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/csm_D-Cut_a38a54ae43-700x661-1.jpg 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/csm_D-Cut_a38a54ae43-700x661-1-300x283.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">We needed an adapter or, using mechanical engineering lingo, a\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Key_(engineering)\" target=\"_tabs\" rel=\"noopener noreferrer\">key<\/a>, to make it work. Naturally, our first idea of how to solve the problem was, \u201cHey, we can just 3D print it!\u201d Because one, 3D printers are awesome, and two, we measured the parts and started designing that little piece for 3D printing pretty immediately.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4025\" width=\"352\" height=\"148\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/knob_axle_vs_stepper_axle.png\" alt=\"Blueprints to 3D print an adapter\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/knob_axle_vs_stepper_axle.png 352w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/knob_axle_vs_stepper_axle-300x126.png 300w\" sizes=\"(max-width: 352px) 100vw, 352px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">It took us seven iterations to arrive to a decent design.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4026\" width=\"700\" height=\"1041\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/key-v7-700x1041-1.png\" alt=\"Picture of final schematic for the adapter\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/key-v7-700x1041-1.png 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/key-v7-700x1041-1-202x300.png 202w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/key-v7-700x1041-1-689x1024.png 689w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">No kidding, semantic versioning applies very well here!<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4034\" width=\"700\" height=\"1244\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/adapter_irl-700x1244-1.png\" alt=\"Picture of the 3D printed adapter\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/adapter_irl-700x1244-1.png 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/adapter_irl-700x1244-1-169x300.png 169w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/adapter_irl-700x1244-1-576x1024.png 576w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">With the key printed it was ready to be attached.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4039\" width=\"700\" height=\"1244\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/it_actually_fit-700x1244-1.png\" alt=\"Picture showing the adapter fits the motor shaft\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/it_actually_fit-700x1244-1.png 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/it_actually_fit-700x1244-1-169x300.png 169w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/it_actually_fit-700x1244-1-576x1024.png 576w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">Success!!! Just for fun, here is the video of the printer doing its thing.<\/p>\n\n<h2 class=\"wp-block-heading\">Making everything better with a Dremel<\/h2>\n\n<p class=\"wp-block-paragraph\">Based on the placement of the flap\u2019s axle relative to the mount arm of the chassis, we figured we could drill out a portion of the mount arm for the stepper. We took the part that holds the vessel and made some adjustments to it, which was the most exciting part.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4042\" width=\"910\" height=\"308\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dremel_fever.png\" alt=\"Slack conversation discussing Dremel Fever\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dremel_fever.png 910w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dremel_fever-300x102.png 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/dremel_fever-768x260.png 768w\" sizes=\"(max-width: 910px) 100vw, 910px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">With a flat cutting head, we removed the plastic that wouldn\u2019t let us insert the steppers.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4044\" width=\"749\" height=\"813\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/image-1.png\" alt=\"Picture of two men putting the project together\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/image-1.png 749w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/image-1-276x300.png 276w\" sizes=\"(max-width: 749px) 100vw, 749px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">Final assembly<\/h2>\n\n<p class=\"wp-block-paragraph\">After a few minutes of carefully channeling the Dremel Fever\u2122, the servos fit snugly. To secure them, we needed to find something that would fit between the servos and the chassis. Looking around we found a nice eraser that would do the job. Who says we can\u2019t take advantage of no longer used prototyping gear and deploy it to prod?<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4045\" width=\"498\" height=\"1024\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_164149-rotated.jpg\" alt=\"A picture of an eraser with lines drawn on it\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_164149-rotated.jpg 498w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_164149-146x300.jpg 146w\" sizes=\"(max-width: 498px) 100vw, 498px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">Inserted it on both sides of the motor and it fit snugly.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4046\" width=\"1024\" height=\"705\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_135913-1.jpg\" alt=\"Picture of eraser on both sides of the motor\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_135913-1.jpg 1024w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_135913-1-300x207.jpg 300w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_135913-1-768x529.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">Perfection.<\/p>\n\n<p class=\"wp-block-paragraph\">We flipped the flappers to face the servos in the back of the dispenser and attached them with the key. The last thing we had to do was to cut the flaps to make sure the servos could easily spin the mechanism.<\/p>\n\n<p class=\"wp-block-paragraph\">Here is the final product from the mechanical perspective.<\/p>\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" class=\"wp-image-4047\" width=\"700\" height=\"946\" src=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_135820-2-700x946-1.jpg\" alt=\"Picture of the final result of the email controlled snack machine\" srcset=\"https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_135820-2-700x946-1.jpg 700w, https:\/\/www.mailgun.com\/wp-content\/uploads\/2025\/07\/20190521_135820-2-700x946-1-222x300.jpg 222w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n<h2 class=\"wp-block-heading\">Pretty cool, right?<\/h2>\n\n<p class=\"wp-block-paragraph\">With all of the mechanical pieces in place, we had to start building the brain of our little machine. What would become the brain of our hard work? A raspberry pi, of course. As we all know, almost anything is possible with a Raspberry Pi, but you\u2019ll have to wait to see how that turned out until next week!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>An Hardware herumzubasteln macht immer Spa\u00df, und es ist schon eine Weile her, dass wir etwas gebaut haben. In dieser kurzen Reihe von Blog-Beitr\u00e4gen werden wir einen per E-Mail gesteuerten Snack-Automaten bauen \u2013 mit einem Spender f\u00fcr trockene Snacks, einem Raspberry Pi, zwei Schrittmotoren und ein wenig 3D-Druck.<\/p>\n","protected":false},"author":14,"featured_media":3952,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[19],"class_list":["post-19882","blog","type-blog","status-publish","has-post-thumbnail","hentry","blog_category-dev-life"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Snack-Zustellmaschine \u2013 Teil 1, die Mechanik - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"Was passiert, wenn man zwei Mitgliedern des Entwicklungsteams einen Dremel und den Traum von Snacks gibt? Dremel-Fieber und eine ganze Menge 3D-Druck.\" \/>\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.mailgun.com\/de\/blog\/dev-life\/snack-zustellmaschine-teil-1-mechanik\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Snack-Zustellmaschine \u2013 Teil 1, die Mechanik - Transactional Email API Service For Developers | Mailgun\" \/>\n<meta property=\"og:description\" content=\"Was passiert, wenn man zwei Mitgliedern des Entwicklungsteams einen Dremel und den Traum von Snacks gibt? 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