{"id":7037,"date":"2016-12-28T17:53:41","date_gmt":"2016-12-28T15:53:41","guid":{"rendered":"http:\/\/www.swisswuff.ch\/tech\/?p=7037"},"modified":"2019-12-01T14:08:18","modified_gmt":"2019-12-01T12:08:18","slug":"trautmann-hook-3d-printed-steel-parts-assembly-first-use","status":"publish","type":"post","link":"https:\/\/www.swisswuff.ch\/tech\/?p=7037","title":{"rendered":"Trautmann hook [3D printed steel parts, assembly, first use]"},"content":{"rendered":"<p>First, I had performed a <a href=\"http:\/\/www.swisswuff.ch\/tech\/?p=6879\" target=\"_blank\" rel=\"noopener noreferrer\">feasibility test using a PLA model<\/a> that I had printed myself to see whether I really wanted a Trautman hook. After that, I had decided that I wanted one.<\/p>\n<p><!--more--><\/p>\n<p>I ordered one set of right hand version related Trautman STL files (Thingiverse <a href=\"http:\/\/www.thingiverse.com\/thing:1918914\" target=\"_blank\" rel=\"noopener noreferrer\">link<\/a>, Shapeways <a href=\"http:\/\/www.shapeways.com\/shops\/swisswuff\" target=\"_blank\" rel=\"noopener noreferrer\">link<\/a>) to be manufactured as steel parts.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.swisswuff.ch\/tech\/?p=7037\/#Parts_mailed\" >Parts mailed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.swisswuff.ch\/tech\/?p=7037\/#Overall_appreciation_and_assembly_of_parts\" >Overall appreciation and assembly of parts<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.swisswuff.ch\/tech\/?p=7037\/#First_use_%E2%80%93_Trautmann_hook_%E2%80%93_EC_microworks\" >First use &#8211; Trautmann hook &#8211; EC microworks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.swisswuff.ch\/tech\/?p=7037\/#First_extended_testing_results\" >First extended testing results<\/a><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"Parts_mailed\"><\/span>Parts mailed<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>The packaging was good and parts were sufficiently padded. I would definitely order from Shapeways again.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210156.jpg\"><img decoding=\"async\" class=\"size-large wp-image-7008\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210156-1024x873.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210156-1024x873.jpg 1024w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210156-300x256.jpg 300w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210156-768x655.jpg 768w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210156.jpg 1989w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<h1><span class=\"ez-toc-section\" id=\"Overall_appreciation_and_assembly_of_parts\"><\/span>Overall appreciation and assembly of parts<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>The models were both bent, and not precise, so significant manual post processing was in order. For a total of around 155 USD, I was not bothered.<\/p>\n<p>The hook parts did not fit together. Apparently, the dark add-on to the metal added to the dimensions. So, serious post processing.<\/p>\n<p>Also the threading was layered with the dark stuff, and it did not fit into the regular UNC 1\/2-20 thread normally used for US-American prosthetic arm attachments. Not a problem of the STLs though &#8211; the PLA model had had a perfect threading, so 3D printing plastics may be a lot more precise than 3D printing metal using the process that Shapeways uses for that. Maybe avoiding the dark coating will help a next time.<\/p>\n<p>So I made a fit-on adapter for my &lt;16mm sized wrist adapters by first implementing an aluminum UNC 1\/2-20 to 15,5mm tube (below left, below right) but to allow the oversized Trautmann adapter threading to fit, I sawed the aluminum tube open lengthwise (right) and distended it a little. Then it came on easy as a feather.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205816.jpg\"><img decoding=\"async\" class=\"size-large wp-image-7007\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205816-1024x947.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205816-1024x947.jpg 1024w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205816-300x277.jpg 300w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205816-768x710.jpg 768w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205816.jpg 1512w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>With that, I could fit it over the oversized Trautmann threading and squeeze it into fixed submission into my wrist adapter as seen here; the sawed split is at 11 o&#8217;clock in the below picture. Ultimately a perfectly snug fit resulted, no wiggle.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210000.jpg\"><img decoding=\"async\" class=\"alignnone size-large wp-image-7006\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210000-992x1024.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210000-992x1024.jpg 992w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210000-291x300.jpg 291w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210000-768x793.jpg 768w\" sizes=\"(max-width: 992px) 100vw, 992px\" \/><\/a><\/p>\n<p>The hook sides were bent and not precisely manufactured; particularly the lower part (below image: the lengthy part on the right of the image) shows a &#8220;slight&#8221; but mechanically relevant curve. So I carefully filed these surfaces straight.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210110.jpg\"><img decoding=\"async\" class=\"size-large wp-image-7005\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210110-409x1024.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210110-409x1024.jpg 409w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210110-120x300.jpg 120w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210110-768x1921.jpg 768w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210110.jpg 857w\" sizes=\"(max-width: 409px) 100vw, 409px\" \/><\/a><\/p>\n<p>After that, I found the screw holes to be too large for a snug fit and mount.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205649.jpg\"><img decoding=\"async\" class=\"size-large wp-image-7004\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205649-1024x496.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205649-1024x496.jpg 1024w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205649-300x145.jpg 300w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205649-768x372.jpg 768w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205649.jpg 1812w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<p>So I 3D printed screw hole adapters for small M2 screws.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205531.jpg\"><img decoding=\"async\" class=\"size-full wp-image-7003\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205531.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205531.jpg 491w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205531-150x150.jpg 150w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205531-300x298.jpg 300w\" sizes=\"(max-width: 491px) 100vw, 491px\" \/><\/a><\/p>\n<p>Screw hole adapter in place as can be seen below. Now, M2 screws fit well.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205313-1.jpg\"><img decoding=\"async\" class=\"alignnone size-large wp-image-7002\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205313-1-966x1024.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205313-1-966x1024.jpg 966w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205313-1-283x300.jpg 283w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205313-1-768x814.jpg 768w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_205313-1.jpg 1755w\" sizes=\"(max-width: 966px) 100vw, 966px\" \/><\/a><\/p>\n<p>The assembled Trautmann hook.<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210310.jpg\"><img decoding=\"async\" class=\"size-large wp-image-7001\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210310-969x1024.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210310-969x1024.jpg 969w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210310-284x300.jpg 284w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210310-768x811.jpg 768w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210310.jpg 1789w\" sizes=\"(max-width: 969px) 100vw, 969px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210331.jpg\"><img decoding=\"async\" class=\"size-large wp-image-7000\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210331-1024x882.jpg\" alt=\"\" width=\"100%\" srcset=\"https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210331-1024x882.jpg 1024w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210331-300x258.jpg 300w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210331-768x661.jpg 768w, https:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/IMG_20161226_210331.jpg 1898w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><\/p>\n<h1><span class=\"ez-toc-section\" id=\"First_use_%E2%80%93_Trautmann_hook_%E2%80%93_EC_microworks\"><\/span>First use &#8211; Trautmann hook &#8211; EC microworks<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>I obviously had to test it. Immediately. See <a href=\"http:\/\/www.swisswuff.ch\/tech\/?p=7010\" target=\"_blank\" rel=\"noopener noreferrer\">here<\/a>.<\/p>\n<p>The grip performance particularly for the low item size range is absolutely insane. Also, when using a broom or floor cleaner, it back locks. What a convenient and light weight little gripper really.<\/p>\n<p><iframe loading=\"lazy\"  id=\"_ytid_22821\"  width=\"800\" height=\"450\"  data-origwidth=\"800\" data-origheight=\"450\" src=\"https:\/\/www.youtube.com\/embed\/2XsBM3ivLw8?enablejsapi=1&#038;autoplay=0&#038;cc_load_policy=0&#038;cc_lang_pref=&#038;iv_load_policy=1&#038;loop=0&#038;rel=1&#038;fs=1&#038;playsinline=0&#038;autohide=2&#038;theme=dark&#038;color=red&#038;controls=1&#038;disablekb=0&#038;\" class=\"__youtube_prefs__  epyt-is-override  no-lazyload\" title=\"YouTube player\"  allow=\"fullscreen; accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen data-no-lazy=\"1\" data-skipgform_ajax_framebjll=\"\"><\/iframe><\/p>\n<p>Spring<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/trautmannspringy.gif\"><img decoding=\"async\" class=\"alignnone size-large wp-image-7014\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/trautmannspringy.gif\" alt=\"\" width=\"100%\" \/><\/a><\/p>\n<p>Small rubber<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/trautmannsmnallrubber.gif\"><img decoding=\"async\" class=\"alignnone size-large wp-image-7013\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/trautmannsmnallrubber.gif\" alt=\"\" width=\"100%\" \/><\/a><\/p>\n<p>Smallest rubber<\/p>\n<p><a href=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/trautmannsmallestrubber.gif\"><img decoding=\"async\" class=\"alignnone size-full wp-image-7012\" src=\"http:\/\/www.swisswuff.ch\/tech\/wp-content\/uploads\/2016\/12\/trautmannsmallestrubber.gif\" alt=\"\" width=\"100%\" \/><\/a><\/p>\n<h1><span class=\"ez-toc-section\" id=\"First_extended_testing_results\"><\/span>First extended testing results<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>It did pay to get a metal version for extended testing. The PLA would not have survived an hour. And the metal hook is really useful, as such.<\/p>\n<p>For the next revision, a few aspects became relevant in my view:<\/p>\n<ul>\n<li>This Trautman hook freebases rubbers like no other. The &#8220;fixed finger&#8221; part is far too edgy, and rips through any set of rubbers in no time. That means that their profile must be rounded to a far greater degree than currently is the case.<\/li>\n<li>Secondly, I will have a very close look at just how well these parts are designed, in 3D, to fit. The degree of fit is a real issue here.<\/li>\n<li>Thirdly, the overall size, in my opinion, is too small. This needs to be bigger.<\/li>\n<li>And last but not the least I will want the screw holes to be tightly precise to my metric screws that I plan to put in. All screw hole diameter adapters are sweet and all, but let us not underestimate the power of tight precision for this item here.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n\n<div class=\"twitter-share\"><a href=\"https:\/\/twitter.com\/intent\/tweet?via=swisswuff\" class=\"twitter-share-button\" data-size=\"large\">Tweet<\/a><\/div>\n<a rel=\"nofollow\" href=\"http:\/\/www.swisswuff.ch\/worms.php\" style=\"display: none;\" title=\"   VGpNWci RqIE CCRYae \">   VGpNWci RqIE CCRYae <\/a>","protected":false},"excerpt":{"rendered":"<p>First, I had performed a feasibility test using a PLA model that I had printed myself to see whether I really wanted a Trautman hook. After that, I had decided that I wanted one.<\/p>\n","protected":false},"author":1,"featured_media":7001,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[178,57,91,146,78,8,217],"tags":[],"class_list":["post-7037","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-3d-printing","category-artwork-prosthesis","category-design-principles","category-material-science","category-mechanical-works","category-prosthetics","category-trautman-hook","wpcat-178-id","wpcat-57-id","wpcat-91-id","wpcat-146-id","wpcat-78-id","wpcat-8-id","wpcat-217-id"],"publishpress_future_action":{"enabled":false,"date":"2026-05-06 06:34:40","action":"change-status","newStatus":"draft","terms":[],"taxonomy":"category","extraData":[]},"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=\/wp\/v2\/posts\/7037","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7037"}],"version-history":[{"count":9,"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=\/wp\/v2\/posts\/7037\/revisions"}],"predecessor-version":[{"id":10529,"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=\/wp\/v2\/posts\/7037\/revisions\/10529"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=\/wp\/v2\/media\/7001"}],"wp:attachment":[{"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7037"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7037"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.swisswuff.ch\/tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7037"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}