Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Fri, 01 Oct 2004 02:25:52 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d22.mx.aol.com ([205.188.144.208] verified) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 439086 for lml@lancaironline.net; Fri, 01 Oct 2004 01:10:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.208; envelope-from=Newlan2dl@aol.com Received: from Newlan2dl@aol.com by imo-d22.mx.aol.com (mail_out_v37_r3.7.) id q.79.34e3a09e (3980) for ; Fri, 1 Oct 2004 01:10:27 -0400 (EDT) From: Newlan2dl@aol.com X-Original-Message-ID: <79.34e3a09e.2e8e40c3@aol.com> X-Original-Date: Fri, 1 Oct 2004 01:10:27 EDT Subject: Re: [LML] Re: Legacy missing wing panel X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1096607427" X-Mailer: 9.0 for Windows sub 5032 -------------------------------1096607427 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Hi Chris Air grinders (or any other air tool) when lubricated make a fine aerosol of the oil in the air once you start using it so the rule is don't oil your tools in your shop and then start using them. In fact, you have to be very careful of oiling anything so that it doesn't get in the air, like saw blades and using spray silicone (the worst). At Boeing, you can be fired for walking into the bonding shop with a spray can of silicone lubricant. That only makes sense because of the millions of dollars of parts there that can no longer pass inspection should any of that be released. It is so bad that parts lubricated in one area of the shop can cause poor bonds across the hanger. It isn't necissarily always that bad, but it will seriously degrade adhesion given half a chance. It becomes an uncontrolled variable so you should avoid if at all possible. In an ideal world, no sanding and tools would be used in a bonding/laminating area. Awhile back one person on the LML had stated that "Jeffco with some flox is the same as Hysol..." I had real concerns about that and have since done some reseach that showed the Jeffco isn't as good an adhesive as Hysol. I still have to post the results but the bottom line is that you should stick with the Hysol when it is specified. I'm still surprised that the Jeffco failed as it did since I would have expected many fibers to be pulled from the laminate. BTW, I tend to avoid the use of air tools due to their need to be lubricated. But that is not to say that I haven't used them, ever. Dan -------------------------------1096607427 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Hi Chris

Air grinders (or any other air tool) when lubricated make a fine aeroso= l of the oil in the air once you start using it so the rule is don't oil you= r tools in your shop and then start using them. In fact, you have to b= e very careful of oiling anything so that it doesn't get in the air, like sa= w blades and using spray silicone (the worst). At Boeing, you can be f= ired for walking into the bonding shop with a spray can of silicone lubrican= t. That only makes sense because of the millions of dollars of parts t= here that can no longer pass inspection should any of that be released. = ; It is so bad that parts lubricated in one area of the shop can cause poor=20= bonds across the hanger. It isn't necissarily always that bad, bu= t it will seriously degrade adhesion given half a chance. It beco= mes an uncontrolled variable so you should avoid if at all possible.&n= bsp; In an ideal world, no sanding and tools would be used in a bonding/lami= nating area.

Awhile back one person on the LML had stated that "Jeffco with some flo= x is the same as Hysol..." I had real concerns about that and have sin= ce done some reseach that showed the Jeffco isn't as good an adhesive as Hys= ol. I still have to post the results but the bottom line is that you s= hould stick with the Hysol when it is specified. I'm still surprised t= hat the Jeffco failed as it did since I would have expected many fibers= to be pulled from the laminate.

BTW, I tend to avoid the use of air tools due to their need to be lubri= cated. But that is not to say that I haven't used them, ever.

Dan

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