X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ispmxmta09-srv.windstream.net ([166.102.165.170] verified) by logan.com (CommuniGate Pro SMTP 5.2.4) with ESMTP id 3000941 for flyrotary@lancaironline.net; Wed, 02 Jul 2008 11:38:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=166.102.165.170; envelope-from=montyr2157@alltel.net Received: from ispmxaamta08-gx.windstream.net ([98.20.239.49]) by ispmxmta09-srv.windstream.net with ESMTP id <20080702153727.SONR25313.ispmxmta09-srv.windstream.net@ispmxaamta08-gx.windstream.net> for ; Wed, 2 Jul 2008 10:37:27 -0500 Received: from dude8ebbe0a30c ([98.20.239.49]) by ispmxaamta08-gx.windstream.net with SMTP id <20080702153727.CSVF6463.ispmxaamta08-gx.windstream.net@dude8ebbe0a30c> for ; Wed, 2 Jul 2008 10:37:27 -0500 Message-ID: <000801c8dc59$87dae990$6601a8c0@dude8ebbe0a30c> From: "Monty Roberts" To: "Rotary motors in aircraft" Subject: PSRU oil drain Date: Wed, 2 Jul 2008 10:37:26 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C8DC2F.9EE376E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C8DC2F.9EE376E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ernest, You are going to need a sharp carbide drill and coolant to make the hole = in the hardened ring gear. You also need to make sure the speed and feed = rate is correct. The hole is small and the speed will need to be higher = than you might think. I'm sure you can find speeds and feeds somewhere = online, or in the machineries handbook. here is one reference: http://its.fvtc.edu/machshop1/drillpress/feedratecalc.htm http://its.fvtc.edu/machshop1/drillpress/cutspeeds.htm You could also use an EDM. Which would be my preference, especially if = the hole is very deep.=20 Or you could just drill in the softer housing ;-) Monty ------=_NextPart_000_0005_01C8DC2F.9EE376E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ernest,
 
You are going to need a sharp carbide = drill and=20 coolant to make the hole in the hardened ring gear. You also need to = make sure=20 the speed and feed rate is correct. The hole is small and the speed will = need to=20 be higher than you might think. I'm sure you can find speeds and = feeds=20 somewhere online, or in the machineries handbook. here is one=20 reference:
 
http:/= /its.fvtc.edu/machshop1/drillpress/feedratecalc.htm
 
http://it= s.fvtc.edu/machshop1/drillpress/cutspeeds.htm
 
 
You could also use an EDM. Which would = be my=20 preference, especially if the hole is very deep.
 
Or you could just drill in the softer = housing=20 ;-)
 
Monty
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