Received: from PCH.mit.edu (18.7.21.50) by mail.efplus.com (192.168.0.8) with Microsoft SMTP Server (TLS) id 8.3.485.1; Sun, 18 Jul 2021 00:02:52 -0700 Received: from PCH.MIT.EDU (localhost.localdomain [127.0.0.1]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 16I6qBEQ030211; Sun, 18 Jul 2021 02:53:13 -0400 Received: from outgoing-exchange-7.mit.edu (OUTGOING-EXCHANGE-7.MIT.EDU [18.9.28.58]) by PCH.mit.edu (8.14.7/8.12.8) with ESMTP id 16I6q9C2030208 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Sun, 18 Jul 2021 02:52:09 -0400 Received: from oc11exedge1.exchange.mit.edu (OC11EXEDGE1.EXCHANGE.MIT.EDU [18.9.3.17]) by outgoing-exchange-7.mit.edu (8.14.7/8.12.4) with ESMTP id 16I6q5HU011484 for ; Sun, 18 Jul 2021 02:52:09 -0400 Received: from w92expo25.exchange.mit.edu (18.7.74.31) by oc11exedge1.exchange.mit.edu (18.9.3.17) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Sun, 18 Jul 2021 02:52:09 -0400 Received: from w92exhyb1.exchange.mit.edu (18.7.71.12) by w92expo25.exchange.mit.edu (18.7.74.31) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Sun, 18 Jul 2021 02:52:07 -0400 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (104.47.57.176) by w92exhyb1.exchange.mit.edu (18.7.71.12) with Microsoft SMTP Server (TLS) id 15.0.1497.18 via Frontend Transport; Sun, 18 Jul 2021 02:52:07 -0400 Received: from DS7PR03CA0257.namprd03.prod.outlook.com (2603:10b6:5:3b3::22) by BY3PR01MB6548.prod.exchangelabs.com (2603:10b6:a03:361::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.23; Sun, 18 Jul 2021 06:52:05 +0000 Received: from DM6NAM11FT008.eop-nam11.prod.protection.outlook.com (2603:10b6:5:3b3:cafe::a0) by DS7PR03CA0257.outlook.office365.com (2603:10b6:5:3b3::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.23 via Frontend Transport; Sun, 18 Jul 2021 06:52:05 +0000 Received: from mail-lj1-f171.google.com (209.85.208.171) by DM6NAM11FT008.mail.protection.outlook.com (10.13.172.85) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.21 via Frontend Transport; Sun, 18 Jul 2021 06:52:05 +0000 Received: by mail-lj1-f171.google.com with SMTP id y7so20265473ljm.1 for ; Sat, 17 Jul 2021 23:52:05 -0700 (PDT) From: RussellMc To: Microcontroller discussion list - Public. , ApptechNZ Sender: "piclist-bounces@mit.edu" Date: Sat, 17 Jul 2021 23:51:24 -0700 Subject: Re: [EE] plastic molding question Thread-Topic: [EE] plastic molding question Thread-Index: Add7ou2BQKxTQMDEQzaK9B6eZDzeww== Message-ID: References: List-Help: List-Subscribe: , List-Unsubscribe: , In-Reply-To: Reply-To: Microcontroller discussion list - Public. Accept-Language: en-US X-MS-Exchange-Organization-AuthAs: Anonymous X-MS-Exchange-Organization-AuthSource: TS500.efplus4.local X-MS-Has-Attach: X-Auto-Response-Suppress: All X-MS-Exchange-Organization-SenderIdResult: Pass X-MS-Exchange-Organization-PRD: mit.edu X-MS-TNEF-Correlator: received-spf: Pass (protection.outlook.com: domain of gmail.com designates 209.85.208.171 as permitted sender) receiver=protection.outlook.com; client-ip=209.85.208.171; helo=mail-lj1-f171.google.com; dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=ksdqUaPtGb9iWcsLxYGsHBaw1T+TpnTAyk2eoJrJ1HY=; b=rFQrdQqED9QGXTORjDjOfdx9jcR0SlztT0cWCF7e6v+9G26WWWwyciBP4uUDXaiyVk GaSc7dFcie7+tt5QZ5fB9UFcFRISl1pgCyeCMjPYJlu8x/oPr8vGVbdMxmX16h/XpwOk p6JrlmOad731C5YN2JapZ+mpTzDK2glyglUEpWBm3k88s6Rr1SZPCSzaftW7qRbUfGx+ q+yPG9HAAjku9S+5aV05MX05m1p7IS2BKl6uRMqPma/BjSPJFmYq3UOMDRyYVlSwZ8o6 JW7D95Au7XpBZGybF0j8u/6UbCeg/8IGC2yeKcrJOdiuzuwCrc2dqWxCifIl8FN1OueE J/7g== authentication-results: spf=pass (sender IP is 209.85.208.171) smtp.mailfrom=gmail.com; mit.edu; dkim=pass (signature was verified) header.d=gmail.com; mit.edu; dmarc=pass action=none header.from=gmail.com; errors-to: piclist-bounces@mit.edu list-id: "Microcontroller discussion list - Public." list-post: x-beenthere: piclist@mit.edu x-mailman-version: 2.1.6 x-received: by 2002:a2e:bc20:: with SMTP id b32mr16987265ljf.422.1626591123300; Sat, 17 Jul 2021 23:52:03 -0700 (PDT) x-topics: [EE] x-content-filtered-by: Mailman/MimeDel 2.1.6 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 On Sun, 18 Jul 2021 at 14:36, Bob Blick wrote: > What is this molding feature called?-- > > If that's where the plastic was injected then it may be a sprue or part o= f a runner. The sprue is actually the channel but I've heard the remaining plastic so referred to. And the two tems can be combined where plastic enters via a sprue and feeds runners. Or your bump may be something else. A runner is a plastic channel remainder - cold runner processes have a long sprue attached after injection and hot runner processes (where the mold is kept heated and the plastic does not harden between cycles have almost no external sprue. Cold runner mould sare cheaper to make but produce more waste and a longer cycle time. Russell https://wiki2.org/en/Sprue_(manufacturing) https://www.google.com/search?rlz=3D1C1CHBF_enNZ834NZ839&sxsrf=3DALeKk029Gw= u35Rl_1F0woNN0CoHW8lfKXA:1626590795346&source=3Duniv&tbm=3Disch&q=3Dtypes+o= f+sprue+in+injection+molding&sa=3DX&ved=3D2ahUKEwjYl7T0guzxAhXt7HMBHZ10CVMQ= jJkEegQIBBAC&biw=3D2560&bih=3D1345 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .