X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d03.mx.aol.com ([205.188.157.35] verified) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 611712 for flyrotary@lancaironline.net; Fri, 22 Jul 2005 12:25:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.35; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d03.mx.aol.com (mail_out_v38_r1.7.) id q.1b8.17a50200 (2612) for ; Fri, 22 Jul 2005 12:24:53 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <1b8.17a50200.301277d3@aol.com> Date: Fri, 22 Jul 2005 12:24:51 EDT Subject: Re: [FlyRotary] Re: TES "O" Rings To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1122049491" X-Mailer: 9.0 SE for Windows sub 5017 -------------------------------1122049491 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 7/22/2005 9:18:35 AM Pacific Standard Time, WRJJRS@aol.com writes: In a message dated 7/22/2005 8:04:18 AM Pacific Standard Time, 13brv3@bellsouth.net writes: Back in 2002, the attached pictures were distributed, showing what happens when the o-ring fills the groove too completely. Thanks for the amazing picture Bill! I'm as guilty as anyone when it comes to trying to "improve" the design, but sometimes we need an example like this to remind us that Mazda has spent way more time and money getting this right, than all of us combined could ever imagine. Cheers, Rusty (going to be hard to run a stock single rotor Mazda though) Just for reference guys, Most fluid o-ring seals fill between 75-85% of the groove WHEN COMPRESSED. That means that the o-ring will be above the groove about 25-30% before assembly. The diameter of the o-ring will USUALLY leave about 30-40% of the width of the groove visible BEFORE ASSEMBLY. To my eye this has always looked like too much free space, but like many other engineering items has been established by breaking parts like in the picture. If you live in the USA you can get a phamplet circular from Parker which shows the gland (the o-ring groove) sizes for most standard size o-rings. usually available for free. They have a larger catalog that shows how to calculate the o-ring and groove sizes. This is avalable even from the cheapest sales shops for a few bucks. Highly recomended if you plant to size o-rings. There are signifigant differences between TYPES of groove seals as well; the rotor housings are a static face gland. Parts that move or rotate have different sized grooves and more importantly different surfaces finishes. (roughness or the lack of it!) Bill Jepson please note the added words IN RED to clarify. WRJ -------------------------------1122049491 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 7/22/2005 9:18:35 AM Pacific Standard Time,=20 WRJJRS@aol.com writes:
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>
In a message dated 7/22/2005 8:04:18 AM Pacific Standard Time,=20 13brv3@bellsouth.net writes:
Back in 2002, the attached pictur= es were=20 distributed, showing what happens when the o-ring fills the groove too=20 completely.  
 
= Thanks for the amazing picture Bill!  = ; I'm as=20 guilty as anyone when it comes to trying to "improve" the design, b= ut=20 sometimes we need an example like this to remind us that Mazda has spent= way=20 more time and money getting this right, than all of us combined cou= ld=20 ever imagine.   
 
Cheers,
Rusty (going to be hard to run a stock single= rotor=20 Mazda though)
Just for reference guys,
 Most fluid o-ring seals fill between 75-85% of the groove WHEN=20 COMPRESSED. That means that the o-ring will be above the groove about 25-3= 0%=20 before assembly. The diameter of the o-ring will USUALLY leave about 30-40= % of=20 the width of the groove visible BEFORE ASSEMBLY. To=20 my eye this has always looked like too much free space, but like many othe= r=20 engineering items has been established by breaking parts like in the pictu= re.=20 If you live in the USA you can get a phamplet circular from Parker which s= hows=20 the gland (the o-ring groove) sizes for most standard size o-rings. usuall= y=20 available for free. They have a larger catalog that shows how to calculate= the=20 o-ring and groove sizes. This is avalable even from the cheapest sales sho= ps=20 for a few bucks. Highly recomended if you plant to size o-rings. There are= =20 signifigant differences between TYPES of groove seals as well; the rotor=20 housings are a static face gland. Parts that move or rotate have different= =20 sized grooves and more importantly different surfaces finishes. (roughness= or=20 the lack of it!)
 
Bill Jepson
please note the added words IN RED to clar= ify.=20 WRJ
 
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