{"id":1444,"date":"2008-06-24T11:28:15","date_gmt":"2008-06-24T16:28:15","guid":{"rendered":"https:\/\/www.ulprospector.com\/knowledge\/?p=1444"},"modified":"2018-02-09T14:06:06","modified_gmt":"2018-02-09T20:06:06","slug":"pe-the-plane-truth-rotational-draft","status":"publish","type":"post","link":"https:\/\/ulprospector.ul.com\/1444\/pe-the-plane-truth-rotational-draft\/","title":{"rendered":"The Plane Truth about Rotational Draft"},"content":{"rendered":"<p>By <a href=\"http:\/\/www.protomold.com?source=UL-IDES\" target=\"_blank\">Protomold<\/a> &#8211; Nobody&#8217;s Faster In The Short Run.\u00ae<\/p>\n<p>Let&#8217;s say you&#8217;re designing a plastic part with rotational symmetry; for simplicity, we&#8217;ll make it a dowel. In your CAD software you would create the shape of half the cross-section \u2014 in this case, a rectangle (see Figure 1) \u2014 and rotate that shape through 360\u00b0 to create the solid. So far, so good! However, knowing that your part is going to be injection molded and that the parting line of the mold will run along the length of your dowel, you realize that, unless you do something, the end faces of the dowel will be parallel to the direction of mold opening. In other words, those ends need to be drafted. There are two ways to draft those ends, one of which works better than the other.<\/p>\n<table border=\"0\" width=\"63%\" align=\"center\">\n<tbody>\n<tr>\n<td align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www2.ulprospector.com\/images\/articles\/protomold\/0801_jan_design_tip\/fig1.gif\" alt=\"Undrafted Dowel Half Cross Section \" width=\"393\" height=\"179\" \/><\/td>\n<\/tr>\n<tr>\n<td class=\"idesGrey\" align=\"center\">Fig. 1: Undrafted Dowel Half Cross Section<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The problematic method is also the most obvious: when laying out the cross section, you tilt the ends slightly (See Figure 2).<\/p>\n<table border=\"0\" width=\"60%\" align=\"center\">\n<tbody>\n<tr>\n<td align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www2.ulprospector.com\/images\/articles\/protomold\/0801_jan_design_tip\/fig2.gif\" alt=\"Pre-drafted Dowel Half Cross Section\" width=\"393\" height=\"179\" \/><\/td>\n<\/tr>\n<tr>\n<td class=\"idesGrey\" align=\"center\">Fig. 2: Pre-drafted Dowel Half Cross Section<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>This way, when you rotate the shape it makes the ends of the finished design shallow cones instead of flat disks (See Figures 3a and 3b). This is &#8220;rotational drafting&#8221;, and it combines the drafting step with the rotation that creates the 3D shape.<\/p>\n<table border=\"0\" width=\"60%\" align=\"center\">\n<tbody>\n<tr>\n<td align=\"center\" height=\"268\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www2.ulprospector.com\/images\/articles\/protomold\/0801_jan_design_tip\/fig3a.gif\" alt=\"Part Design Resulting from Rotational Draft Method\" width=\"393\" height=\"259\" \/><\/td>\n<\/tr>\n<tr>\n<td class=\"idesGrey\" align=\"center\">Fig. 3a: Part Design Resulting from Rotational Draft Method<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table border=\"0\" width=\"59%\" align=\"center\">\n<tbody>\n<tr>\n<td align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www2.ulprospector.com\/images\/articles\/protomold\/0801_jan_design_tip\/fig3b.gif\" alt=\"Part Design Resulting from Rotational Draft Method \" width=\"393\" height=\"259\" \/><\/td>\n<\/tr>\n<tr>\n<td class=\"idesGrey\" align=\"center\">Fig. 3b: Part Design Resulting from Rotational Draft Method<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The preferred method is &#8220;planar drafting&#8221; and it is a separate step from the rotation that creates the basic part. In this case, each half of the end surface is drafted separately in a plane angled away from the parting line (See Figures 4a and 4b). The key difference between these two approaches is what happens as the drafted surface approaches the parting line.<\/p>\n<table border=\"0\" width=\"59%\" align=\"center\">\n<tbody>\n<tr>\n<td align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www2.ulprospector.com\/images\/articles\/protomold\/0801_jan_design_tip\/fig4a.gif\" alt=\"Part Design Resulting from Planar Draft Method\" width=\"393\" height=\"259\" \/><\/td>\n<\/tr>\n<tr>\n<td class=\"idesGrey\" align=\"center\">Fig. 4a: Part Design Resulting from Planar Draft Method<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table border=\"0\" width=\"60%\" align=\"center\">\n<tbody>\n<tr>\n<td align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/www2.ulprospector.com\/images\/articles\/protomold\/0801_jan_design_tip\/fig4b.gif\" alt=\"Part Design Resulting from Planar Draft Method \" width=\"393\" height=\"259\" \/><\/td>\n<\/tr>\n<tr>\n<td class=\"idesGrey\" align=\"center\">Fig. 4b: Part Design Resulting from Planar Draft Method<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Why is this an important topic for rapid injection molding? Protomold&#8217;s 3-axis milling process plunges in the z-axis only. This makes a planar draft a simpler, more reliable cut than a rotational draft, due to the latter&#8217;s varying cut angle. For this reason, the ProtoQuote design analysis will show these rotational draft issues as required changes and ask for increased draft, wall thickness or both. The easiest fix is to replace the rotational draft with a planar draft.<\/p>\n<p>Sometimes a flat world is just a lot easier to navigate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>By Protomold &#8211; Nobody&#8217;s Faster In The Short Run.\u00ae Let&#8217;s say you&#8217;re designing a plastic part with rotational symmetry; for simplicity, we&#8217;ll make it a dowel. In your CAD software you would create the shape of half the cross-section \u2014 &hellip; <a href=\"https:\/\/ulprospector.ul.com\/1444\/pe-the-plane-truth-rotational-draft\/\">Continued<\/a><\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","footnotes":""},"categories":[29,21],"tags":[28,276],"ppma_author":[1237],"class_list":{"0":"post-1444","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-processing","7":"category-plastics-2","8":"tag-protomold","9":"tag-processing","10":"entry"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>The Plane Truth about Rotational Draft - Prospector Knowledge Center<\/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:\/\/ulprospector.ul.com\/1444\/pe-the-plane-truth-rotational-draft\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Plane Truth about Rotational Draft - Prospector Knowledge Center\" \/>\n<meta property=\"og:description\" content=\"By Protomold &#8211; Nobody&#8217;s Faster In The Short Run.\u00ae Let&#8217;s say you&#8217;re designing a plastic part with rotational symmetry; for simplicity, we&#8217;ll make it a dowel. 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