X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from misav07.sasknet.sk.ca ([142.165.20.171] verified) by logan.com (CommuniGate Pro SMTP 5.1.5) with ESMTP id 1803263 for flyrotary@lancaironline.net; Wed, 31 Jan 2007 23:06:47 -0500 Received-SPF: none receiver=logan.com; client-ip=142.165.20.171; envelope-from=hjjohnson@sasktel.net Received: from bgmpomr2.sasknet.sk.ca ([142.165.72.23]) by misav07 with InterScan Messaging Security Suite; Wed, 31 Jan 2007 22:06:00 -0600 Received: from home ([71.17.120.171]) by bgmpomr2.sasknet.sk.ca (SaskTel eMessaging Service) with ESMTPA id <0JCR00HPENE0AX00@bgmpomr2.sasknet.sk.ca> for flyrotary@lancaironline.net; Wed, 31 Jan 2007 22:06:00 -0600 (CST) Date: Wed, 31 Jan 2007 22:08:01 -0600 From: Jarrett & Heidi Johnson Subject: Re: [FlyRotary] gantry mill To: Rotary motors in aircraft Message-id: <004501c745b6$90c82a30$6401a8c0@home> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Mailer: Microsoft Outlook Express 6.00.2900.3028 Content-type: multipart/alternative; boundary="Boundary_(ID_QHKfmn8Myarf+gCjjkRjGA)" X-Priority: 3 X-MSMail-priority: Normal References: This is a multi-part message in MIME format. --Boundary_(ID_QHKfmn8Myarf+gCjjkRjGA) Content-type: text/plain; charset=iso-8859-1 Content-transfer-encoding: quoted-printable No Kevin I wasn't aware, I'll have to go do some 'googlein' and check it = out. CNC has come a long way from the good ol' days of punch cards and = reel tapes :-) While its nothing in comparison to McDonnell, the = control I'm using on my machine runs at over 4Mhz per axis, that doesn't = sound like much when we have comp's running in the Ghz but, thats 4 = MILLION resolved position calculations and movement commands per = second.The tool will pass through 12 million resolved points per second = at full rate [when runing 3 axis at full rate and can drive up to 6 axis = at this rate if desired] I don't ever plan to run it that fast or to = that high of a command rate as its not needed in my case. As you'd = stated machining a huge titanium bulkhead would need a higher = performance system which can hit these resolutions and stop if an error = is found. I have no idea what Titanium is worth, but I'm sure I don't = want to have to foot the bill for a buggered up part :-). The gantry on = my mill isn't that heavy, its only about 3/4 ton but that was enough :-) = moving stuff like that around in your own shop w/ little to no heavy = lifting gear can be a challange for sure. A twin gantry mill would sure = be a site to see, I can't imagine writing the code for that, even w/ a = proper CAM. It's always exciting to hear of others who have done the = same thing and had success. Thanks! Jarrett ----- Original Message -----=20 From: kevin lane=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 31, 2007 8:50 PM Subject: [FlyRotary] gantry mill Jarret - when I worked at McDonnell-Douglas they had a twin gantry = mill. the bed was like 40', but the newer fighters had no pieces over = 15' so they added another mill. the gantries were huge, weighing many = tons. a secondary, independent computer would run while parts were = being milled, checking for any errors (not good on say titanium = bulkheads that take 2 months to mill). if it detected an error it could = shut the gantry down within less than thousandths of an inch. they told = me that it sounded like an explosion when all that tonnage hit the wall. = these machines had footings the volume of a 2 car garage. I was in the home built soaring club for a while. there was a man = building a plug doing exactly what you outlined. he was connected with = a university and used their equipment. maybe his plane is the = "lighthawk" I believe? he was proud of his ability to produce many = parts that all fit to tight tolerances. I didn't know if you were aware = of this project. kevin -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.17/661 - Release Date: = 1/30/2007 11:30 PM --Boundary_(ID_QHKfmn8Myarf+gCjjkRjGA) Content-type: text/html; charset=iso-8859-1 Content-transfer-encoding: 7BIT
No Kevin I wasn't aware, I'll have to go do some 'googlein' and check it out.  CNC has come a long way from the good ol' days of punch cards and reel tapes :-) While its nothing in comparison to McDonnell,  the control I'm using on my machine runs at over 4Mhz per axis, that doesn't sound like much when we have comp's running in the Ghz but, thats 4 MILLION resolved position calculations and movement commands per second.The tool will pass through 12 million resolved points per second at full rate [when runing 3 axis at full rate and can drive up to 6 axis at this rate if desired] I don't ever plan to run it that fast or to that high of a command rate as its not needed in my case. As you'd stated machining a huge titanium bulkhead would need a higher performance system which can hit these resolutions and stop if an error is found. I have no idea what Titanium is worth, but I'm sure I don't want to have to foot the bill for a buggered up part :-). The gantry on my mill isn't that heavy, its only about 3/4 ton but that was enough :-) moving stuff like that around in your own shop w/ little to no heavy lifting gear can be a challange for sure. A twin gantry mill would sure be a site to see, I can't imagine writing the code for that, even w/ a proper CAM. It's always exciting to hear of others who have done the same thing and had success.
 
Thanks!
Jarrett
 
 
----- Original Message -----
From: kevin lane
Sent: Wednesday, January 31, 2007 8:50 PM
Subject: [FlyRotary] gantry mill

Jarret - when I worked at McDonnell-Douglas they had a twin gantry mill.  the bed was like 40', but the newer fighters had no pieces over 15' so they added another mill.  the gantries were huge, weighing many tons.  a secondary, independent computer would run while parts were being milled, checking for any errors (not good on say titanium bulkheads that take 2 months to mill).  if it detected an error it could shut the gantry down within less than thousandths of an inch.  they told me that it sounded like an explosion when all that tonnage hit the wall.  these machines had footings the volume of a 2 car garage.
I was in the home built soaring club for a while.  there was a man building a plug doing exactly what you outlined.  he was connected with a university and used their equipment.  maybe his plane is the "lighthawk" I believe?  he was proud of his ability to produce many parts that all fit to tight tolerances.  I didn't know if you were aware of this project.   kevin

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Checked by AVG Free Edition.
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