{"id":20072,"date":"2019-07-16T00:00:00","date_gmt":"2019-07-16T00:00:00","guid":{"rendered":"https:\/\/www.mailgun.com\/blog\/maquina-de-entrega-de-lanches-parte-1-mecanica\/"},"modified":"2026-09-14T22:06:46","modified_gmt":"2026-09-14T22:06:46","slug":"maquina-de-entrega-de-lanches-parte-1-mecanica","status":"publish","type":"blog","link":"https:\/\/www.mailgun.com\/pt\/blog\/dev-life\/maquina-de-entrega-de-lanches-parte-1-mecanica\/","title":{"rendered":"M\u00e1quina de entrega de lanches: parte 1, a mec\u00e2nica"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Hackear hardware \u00e9 sempre divertido, e\u00a0<a href=\"\/?blog_category=mission-to-mars-pycon-2014\" target=\"_tabs\" rel=\"noopener noreferrer\">faz tempo<\/a>\u00a0que n\u00e3o criamos nada! Nesta breve s\u00e9rie de posts do blog, vamos fazer uma m\u00e1quina de lanches controlada por e-mail usando um dispensador de alimentos secos, um Raspberry Pi, um par de motores de passo e um pouco de impress\u00e3o 3D.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Este post vai focar primeiro na mec\u00e2nica e, na parte dois, continuaremos com a eletr\u00f4nica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Prontos? Vamos l\u00e1!<\/p>\n\n\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-7637\"><p class=\"h5 m-0\" id=\"toc-title-7637\">\u00cdndice<\/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=\"#preparando-os-componentes\">Preparando os componentes<\/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=\"#entendendo-o-sistema-de-transmissao\">Entendendo o sistema de transmiss\u00e3o<\/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=\"#melhorando-tudo-com-uma-dremel\">Melhorando tudo com uma 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=\"#montagem-final\">Montagem final<\/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=\"#muito-legal-nao-e\">Muito legal, n\u00e3o \u00e9?<\/a><\/div><\/div><\/nav>\n\n\n<h2 class=\"wp-block-heading\">Preparando os componentes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Come\u00e7amos com um dispensador de lanches que voc\u00ea encontra em qualquer loja de departamentos ou na internet. Se voc\u00ea tem curiosidade de saber onde compramos o nosso, foi na\u00a0<a href=\"https:\/\/www.amazon.com\/gp\/product\/B00013K8OO\/\" target=\"_tabs\" rel=\"noopener noreferrer\">Amazon<\/a>.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">\u00c9 uma m\u00e1quina bem simples: os lanches entram por cima e voc\u00ea gira a manivela para liber\u00e1-los em uma tigela embaixo. Mas e se conectarmos motores ao mecanismo de libera\u00e7\u00e3o? \u00c9 a\u00ed que entram os motores \u2014 ou melhor, dois motores de passo NEMA-17 de 12 V. Usamos um par de\u00a0<a href=\"https:\/\/www.adafruit.com\/product\/324\" target=\"_tabs\" rel=\"noopener noreferrer\">destes<\/a>, mas aprendemos da pior forma que a m\u00e1quina precisa de um pouco mais de torque do que 0,2 Nm.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Esses pequenos tinham o tamanho perfeito (34 mm de comprimento) e se encaixaram perfeitamente dentro dos dispensadores.<\/p>\n\n\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\n\n<h2 class=\"wp-block-heading\">Entendendo o sistema de transmiss\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Na nossa m\u00e1quina, o bot\u00e3o girat\u00f3rio tinha um eixo &#8220;fresado em formato plano&#8221; que se encaixa na pe\u00e7a com abas de borracha. O motor tamb\u00e9m era fresado, mas o problema \u00e9 que o di\u00e2metro do eixo era muito menor.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Precis\u00e1vamos de um adaptador ou, no jarg\u00e3o da engenharia mec\u00e2nica, de uma\u00a0<a href=\"https:\/\/en.wikipedia.org\/wiki\/Key_(engineering)\" target=\"_tabs\" rel=\"noopener noreferrer\">chaveta<\/a>, para funcionar. Naturalmente, nossa primeira ideia para resolver o problema foi: &#8220;Ei, podemos simplesmente imprimir em 3D!&#8221; Porque, primeiro, as impressoras 3D s\u00e3o incr\u00edveis e, segundo, medimos as pe\u00e7as e come\u00e7amos a projetar aquela pequena pe\u00e7a para impress\u00e3o 3D quase que imediatamente.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Levamos sete itera\u00e7\u00f5es para chegar a um design decente.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Sem brincadeira, o versionamento sem\u00e2ntico se aplica muito bem aqui!<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Com a chaveta impressa, estava tudo pronto para a montagem.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Sucesso!!! S\u00f3 por divers\u00e3o, aqui est\u00e1 o v\u00eddeo da impressora em a\u00e7\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Melhorando tudo com uma Dremel<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Com base no posicionamento do eixo da aba em rela\u00e7\u00e3o ao bra\u00e7o de montagem do chassi, achamos que poder\u00edamos perfurar uma parte do bra\u00e7o de montagem para o motor de passo. Pegamos a pe\u00e7a que segura o recipiente e fizemos alguns ajustes nela, o que foi a parte mais emocionante.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Com uma cabe\u00e7a de corte plana, removemos o pl\u00e1stico que n\u00e3o nos deixava inserir os motores de passo.<\/p>\n\n\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\n\n<h2 class=\"wp-block-heading\">Montagem final<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ap\u00f3s alguns minutos canalizando cuidadosamente a Dremel Fever\u2122, os servomotores se encaixaram perfeitamente. Para fix\u00e1-los, precis\u00e1vamos encontrar algo que coubesse entre os servomotores e o chassi. Olhando ao redor, encontramos uma boa borracha que daria conta do recado. Quem disse que n\u00e3o podemos aproveitar equipamentos de prototipagem que n\u00e3o usamos mais e coloc\u00e1-los em produ\u00e7\u00e3o?<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Inserimos em ambos os lados do motor, com um encaixe perfeito.<\/p>\n\n\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\n\n<p class=\"wp-block-paragraph\">Perfei\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Viramos as abas para a dire\u00e7\u00e3o dos servomotores na parte de tr\u00e1s do dispensador e as prendemos com a chaveta. A \u00faltima coisa que tivemos que fazer foi cortar as abas para garantir que os servomotores pudessem girar o mecanismo com facilidade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aqui est\u00e1 o produto final, do ponto de vista mec\u00e2nico.<\/p>\n\n\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\n\n<h2 class=\"wp-block-heading\">Muito legal, n\u00e3o \u00e9?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Com todas as pe\u00e7as mec\u00e2nicas no lugar, precis\u00e1vamos come\u00e7ar a construir o c\u00e9rebro da nossa pequena m\u00e1quina. O que seria o c\u00e9rebro de todo esse trabalho duro? Um Raspberry Pi, \u00e9 claro. Como todos sabemos, quase tudo \u00e9 poss\u00edvel com um Raspberry Pi, mas voc\u00ea ter\u00e1 que esperar at\u00e9 a semana que vem para ver como ficou!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hackear hardware \u00e9 sempre divertido, e faz tempo que n\u00e3o criamos nada! Nesta breve s\u00e9rie de posts do blog, vamos fazer uma m\u00e1quina de lanches controlada por e-mail usando um dispensador de alimentos secos, um Raspberry Pi, um par de motores de passo e um pouco de impress\u00e3o 3D.<\/p>\n","protected":false},"author":14,"featured_media":3952,"menu_order":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"blog_category":[19],"class_list":["post-20072","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>M\u00e1quina de entrega de lanches \u2013 parte 1, a mec\u00e2nica - Transactional Email API Service For Developers | Mailgun<\/title>\n<meta name=\"description\" content=\"O que acontece quando voc\u00ea d\u00e1 a duas pessoas desenvolvedoras uma Dremel e um sonho com lanches? Dremel Fever e muita impress\u00e3o 3D.\" \/>\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\/pt\/blog\/dev-life\/maquina-de-entrega-de-lanches-parte-1-mecanica\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"M\u00e1quina de entrega de lanches \u2013 parte 1, a mec\u00e2nica - Transactional Email API Service For Developers | Mailgun\" \/>\n<meta property=\"og:description\" content=\"O que acontece quando voc\u00ea d\u00e1 a duas pessoas desenvolvedoras uma Dremel e um sonho com lanches? 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