Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 619639 for flyrotary@lancaironline.net; Mon, 24 Jan 2005 13:05:18 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.rr.com [24.74.185.127]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j0OI4ikd028586 for ; Mon, 24 Jan 2005 13:04:45 -0500 (EST) Message-ID: <001e01c5023f$7f672af0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Babbitt bearing material and heat : [FlyRotary] Performance coatings- bearing damage? Date: Mon, 24 Jan 2005 13:06:59 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C50215.965CA570" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C50215.965CA570 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, January 24, 2005 12:54 PM Subject: [FlyRotary] Performance coatings- bearing damage? Greetings, I just talked to Brad at Performance Coatings, and he said they try to = batch items together, to keep from wasting material. For scheduling = purposes, it's interesting to note that they do piston tops, and rotors = on Wednesdays. They charge $45 for each rotor. The process includes = blasting the rotor faces, spraying on the coating, and curing it at 350 = degrees. They have a fixture that they use on rotors, which keeps = anything from touching the bearing. =20 Will the bearing be damaged at 350 degrees? I'm thinking there's a = good chance it will. =20 Thanks, Rusty (still undecided) Rusty, I suspect our rotary bearings are better than the older babbitt = bearings - but, I know nothing about what the wear surface of todays = automobile bearings are. In any case, it looks if they were made of = babbitt 350F would be a bit too much. The question is would the bearing = get to 350F before the rotor's outter surfaces? Ed A a.. Babbitt has good load carrying capacity between 800 PSI and 1500 = PSI=20 b.. Maximum operating temperature for Babbitt is 300=BA F. In motors = 180=BA F to 190=BA F is considered running hot. Some turbine = applications run as high as 225=B0 F. Many technicians however, will set = the alarm at 185=BA F and trip at 205=BA F. c.. Melting temperature for common Babbitt varies from 350=BA F to = 475=BA F=20 d.. Special bonding techniques are required to metallurgically bond = Babbitt to metal=20 ------=_NextPart_000_001B_01C50215.965CA570 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
 
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Monday, January 24, 2005 = 12:54=20 PM
Subject: [FlyRotary] = Performance=20 coatings- bearing damage?

Greetings,
 
I just talked = to Brad at=20 Performance Coatings, and he said they try to batch items together, to = keep=20 from wasting material.  For scheduling purposes, it's interesting = to note=20 that they do piston tops, and rotors on Wednesdays.   = They=20 charge $45 for each rotor.  The process includes blasting the = rotor=20 faces, spraying on the coating, and curing it at 350 degrees.  = They have=20 a fixture that they use on rotors, which keeps anything from touching = the=20 bearing.  
 
Will the = bearing be=20 damaged at 350 degrees?  I'm thinking = there's a=20 good chance it will. 
 
Thanks,
Rusty (still=20 undecided)
 
Rusty, I = suspect our=20 rotary bearings are better than the older babbitt bearings - but, I = know=20 nothing about what the wear surface of todays automobile bearings = are. =20 In any case, it looks if they were made of babbitt 350F would be a bit = too=20 much.  The question is would the bearing get to 350F before the = rotor's=20 outter surfaces?
 
Ed = A
  • Babbitt has good load carrying = capacity between=20 800 PSI and 1500 PSI

  • Maximum operating temperature for = Babbitt is 300=BA=20 F. In motors 180=BA F to 190=BA F is considered running hot.  = Some turbine=20 applications run as high as 225=B0 F. Many technicians however, will = set the=20 alarm at 185=BA F and trip at 205=BA F.

  • Melting temperature for common = Babbitt varies=20 from 350=BA F to 475=BA =20 F

  • Special bonding techniques are = required to=20 metallurgically bond Babbitt to metal=20
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