X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d04.mx.aol.com ([205.188.157.36] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 912717 for flyrotary@lancaironline.net; Sat, 23 Apr 2005 21:56:44 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.36; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d04.mx.aol.com (mail_out_v38.7.) id q.97.5e1edb93 (2612) for ; Sat, 23 Apr 2005 21:55:54 -0400 (EDT) From: WRJJRS@aol.com Message-ID: <97.5e1edb93.2f9c56aa@aol.com> Date: Sat, 23 Apr 2005 21:55:54 EDT Subject: Re: [FlyRotary] Rotors To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1114307754" X-Mailer: 9.0 for Windows sub 5038 -------------------------------1114307754 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 4/23/2005 7:44:25 AM Pacific Standard Time, alpha@concordnc.com writes: Hey all you smart guys. Why can't the apex groves just be welded up and a new groove cut? Welds are supposed to be as strong as the base metal or stronger. It is not a "new" technology. EDM machining has been recommended to cut the grooves to 3 mm so what am I missing? Is there a better way to do it? Cheaper alternative? Cast our own rotors? Tell me more. Talent and ideas are not in short supply on this list. Jim Brewer Albemarle, NC Jim, The rotors are a cast material, I am going to worry about any solution that doesn't remove material, IE. machining or EDM. A cast material can be hard to weld properly. Even if a cast material is soft it can crystalize below the surface in the presence of too much localized heat. (like welding) I'm not knocking welding since I have that miller syncrowave 250 in my shop, I just wouldn't weld up apex seal slots. Milling to 3mm of EDM to 3mm is another mater. I would consider both of those re-work solutions provided the other slots were well within spec. I would also suggest that shot peening and ceramic coatings should be a good addition to our engines. Bill Jepson -------------------------------1114307754 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 4/23/2005 7:44:25 AM Pacific Standard Time, alpha@co= ncordnc.com writes:

Hey all you smart guys. Why can't the ap= ex groves just be welded up and a new groove cut? Welds are supposed t= o be as strong
as the base metal or stronger. It is not a "new" tec= hnology. EDM machining has been recommended to cut the grooves to 3 mm= so
what am I missing? Is there a better way to do it? Cheape= r alternative? Cast our own rotors? Tell me more. T= alent and ideas are
not in short supply on this list.

Jim BrewerAlbemarle, NC

Jim, The rotors are a cast material, I am going to worry about any solu= tion that doesn't remove material, IE. machining or EDM. A cast material can= be hard to weld properly. Even if a cast material is soft it can crystalize= below the surface in the presence of too much localized heat. (like welding= ) I'm not knocking welding since I have that miller syncrowave 250 in my sho= p, I just wouldn't weld up apex seal slots. Milling to 3mm of EDM to 3mm is=20= another mater. I would consider both of those re-work solutions provided the= other slots were well within spec. I would also suggest that shot peening a= nd ceramic coatings should be a good addition to our engines.

Bill Jepson

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