Delivered-To: jake@vapourforge.com Received: from pch.mit.edu (PCH.MIT.EDU [18.7.21.90]) by mail.vapourforge.com (Postfix) with ESMTP id C5D37CFC0 for ; Thu, 22 Jul 2010 22:50:21 +1000 (EST) Received: from pch.mit.edu (pch.mit.edu [127.0.0.1]) by pch.mit.edu (8.13.6/8.12.8) with ESMTP id o6MCjpq4031767; Thu, 22 Jul 2010 08:45:53 -0400 Received: from mailhub-dmz-4.mit.edu (MAILHUB-DMZ-4.MIT.EDU [18.7.62.38]) by pch.mit.edu (8.13.6/8.12.8) with ESMTP id o6MCjoMM031753 for ; Thu, 22 Jul 2010 08:45:50 -0400 Received: from dmz-mailsec-scanner-8.mit.edu (DMZ-MAILSEC-SCANNER-8.MIT.EDU [18.7.68.37]) by mailhub-dmz-4.mit.edu (8.13.8/8.9.2) with ESMTP id o6MCjDg0000331 for ; Thu, 22 Jul 2010 08:45:50 -0400 X-AuditID: 12074425-b7bfeae000000a0d-48-4c483d7f9a41 Received: from mail-pz0-f49.google.com (mail-pz0-f49.google.com [209.85.210.49]) by dmz-mailsec-scanner-8.mit.edu (Symantec Brightmail Gateway) with SMTP id 91.3B.02573.F7D384C4; Thu, 22 Jul 2010 08:45:52 -0400 (EDT) Received: by pzk3 with SMTP id 3so3314727pzk.36 for ; Thu, 22 Jul 2010 05:45:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:mime-version:received:in-reply-to :references:from:date:message-id:subject:to:content-type; bh=pENbvNQVxwNm2EDBX/l0ccPOmTouRsFrnWYUnLGC8g4=; b=cXBVkjGnJPDb9MGGewd6GjjjTvaAspCZdZKTswhSldZr1jQe9id2W5s/bb3wNeTGpV yc+AJ7jDr/a5//JucSVY5smEuWY3B6pfOwtzP4TcCleuRhy9a4EVY6DAMwp3wGjXHdi4 GS+6ORlMUDGMKBQIqXHED/quhMh2p4GjDi+Dc= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; b=aVuTKAlGQZq4OmfPAY6n2vjBGKeYqEGC6nB7wFY/Zaaq1od119flHAzIVIvAK4UpxJ mVFaONlwo5KUwjzOCfJd6rW0zqIfpPXIyt0BVaYJTzzdDct+86fSnJ6OZCVvTwH+pr0G kyr7ybwaSEn8n9B0wcQdqaMHKdu/n8gVF7HKM= Received: by 10.142.207.5 with SMTP id e5mr2225959wfg.229.1279802749182; Thu, 22 Jul 2010 05:45:49 -0700 (PDT) MIME-Version: 1.0 Received: by 10.142.161.20 with HTTP; Thu, 22 Jul 2010 05:45:19 -0700 (PDT) In-Reply-To: <4C483B55.2030801@windstream.net> References: <4C483B55.2030801@windstream.net> From: RussellMc Date: Fri, 23 Jul 2010 00:45:19 +1200 Message-ID: Subject: Re: [TECH]:: Archimedes Screw - wide range of modern uses To: "Microcontroller discussion list - Public." X-Brightmail-Tracker: AAAABBVGFPIVRqWWFUbSIRVG9dg= X-Topics: [TECH] X-BeenThere: piclist@mit.edu X-Mailman-Version: 2.1.6 Precedence: list Reply-To: "Microcontroller discussion list - Public." List-Id: "Microcontroller discussion list - Public." List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: piclist-bounces@mit.edu Errors-To: piclist-bounces@mit.edu Luis: >> I always wandered about clearances, how close coupled do you guys think >> is the screw to the wall of the tube? >> As anyone found any design notes on designing and building one/ Carl: > On the say 6' diameter, might be 1/2" or more. THese are not made to > aircraft engine tolerances, more like a structural steel fabricating > shop, and that screw is somewhat difficult to shape and weld together > with any real precision. Usually there is no machining of the screw O.D. To start off one MAY be better off winding some sort of tubing around a centre core. Result will be a guaranteed leak proof pump at any angle less than vertical. Volume pumped per turn is related to tube diameter, core diameter and angle. Simple to play would be garden hose. Easy to make but more robust would be eg copper tube - possibly anneal before bending. Impressive would be exhaust tubing. I can imagine a multi section design using injection moulded segments joined together to make whatever length is required. I sense a Coke can based design aborning. Russell -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist