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Hermes SMTP Server) with ESMTPA ID eca0afcf36e5b2c27e4bd415b7102cbd; Fri, 26 Jan 2024 20:08:26 +0000 (UTC) Message-ID: Date: Fri, 26 Jan 2024 15:08:13 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Rotary motors in aircraft Content-Language: en-US Subject: Milling exhaust manifold flat? Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit References: X-Mailer: WebService/1.1.22046 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.aol Content-Length: 456 When I welded on my stock Renesis exhaust manifold the end I welded the 270 deg bend on got warped. It's about 0.04" bent away from completely flat at the top flange at flywheel  end. Doesn't seem to have been an issue during the 100+ hours the engine has run. But for peace of mind I'm wondering if I should mill the three flanges flat. Is it true that I'll need a carbide end mill to do this? Even a 1/2" carbide end mill is close to $30. Finn