Return-Path: Received: from mtiwmhc11.worldnet.att.net ([204.127.131.115] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3042610 for flyrotary@lancaironline.net; Mon, 23 Feb 2004 21:10:16 -0500 Received: from unknown (85.birmingham-04-05rs.al.dial-access.att.net[12.74.163.85]) by worldnet.att.net (mtiwmhc11) with SMTP id <200402240210081110005517e>; Tue, 24 Feb 2004 02:10:09 +0000 Message-ID: <001601c3fa7b$49a55800$55a34a0c@unknown> From: "Michael D. Callahan" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] die grinders Date: Mon, 23 Feb 2004 20:09:50 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0013_01C3FA48.FDFE5A00" 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 This is a multi-part message in MIME format. ------=_NextPart_000_0013_01C3FA48.FDFE5A00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable You may actually want to go to a less aggressive cutter unless you = are really hogging out heavy sections. Those open, low helix aluminum = cutters are intended for gouging out hunks of welds and castings, not = shaping sheet metal. The nearly straight cutting edges tend to bounce = around a lot unless you are REALLY getting on it... hard enough to limit = speed with loading while holding the throttle wide open. They make finer = toothed versions that are also suitable for aluminum. As for speed, run it wide open. The drilling surface speed for = aluminum is about 350ft/min, but milling speeds of 1000ft/min are common = with multi-flute cutters. You can easily double that with carbide. It's = only too fast if it burns up the cutter (which isn't going to happen). = In drilling, the heat is concentrated by the surrounding material... not = a factor with a die grinder. Feed against the rotation. Feeding with the rotation is just begging = it to grab and run. Try to get your hand as stable as possible, because what you are = experiencing is the same as chatter in a machine tool, caused by too = much slop or a flexible setup (doesn't get much more flexible than a = hand held die grinder). If all else fails, get one of these "Super Cut" = vixen files (they make both flat and half-round). I have found them to = be as fast as a die grinder in many situations. They don't jump, are = quiet, and are far more controllable. Mike C. ----- Original Message -----=20 From: kevin lane=20 To: Rotary motors in aircraft=20 Sent: Monday, February 23, 2004 4:31 PM Subject: [FlyRotary] die grinders despite already building a -6a I still have problems with the die = grinder. I have yet to figure out what makes it jump around and what = makes it cut nicely. I am using the very open tooth die that won't clog = up when cutting AL. what is the correct feed direction, speed, etc... I = should be trying? Kevin Lane Portland, OR e-mail-> n3773@comcast.net web-> http://home.comcast.net/~n3773 (browse w/ internet explorer) ------=_NextPart_000_0013_01C3FA48.FDFE5A00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

You may actually want to go to a = less=20 aggressive cutter unless you are really hogging out heavy sections. = Those open,=20 low helix aluminum cutters are intended for gouging out hunks of welds = and=20 castings, not shaping sheet metal. The nearly straight cutting edges = tend to=20 bounce around a lot unless you are REALLY getting on it... hard enough = to limit=20 speed with loading while holding the throttle wide open. They make finer = toothed=20 versions that are also suitable for aluminum.

As for speed, run it wide open. = The=20 drilling surface speed for aluminum is about 350ft/min, but milling = speeds of=20 1000ft/min are common with multi-flute cutters. You can easily double = that with=20 carbide. It's only too fast if it burns up the cutter (which isn't going = to=20 happen). In drilling, the heat is concentrated by the surrounding = material...=20 not a factor with a die grinder.

Feed against the rotation. = Feeding with the=20 rotation is just begging it to grab and run.

Try to get your hand as stable as = possible,=20 because what you are experiencing is the same as chatter in a machine = tool,=20 caused by too much slop or a flexible setup (doesn't get much more = flexible than=20 a hand held die grinder). If all else fails, get one of these "Super = Cut" vixen=20 files (they make both flat and half-round). I have found them to be as = fast as a=20 die grinder in many situations. They don't jump, are quiet, and are far = more=20 controllable. Mike C.

----- Original Message -----
From:=20 kevin = lane=20
To: Rotary motors in = aircraft

Sent: Monday, February 23, 2004 = 4:31=20 PM

Subject: [FlyRotary] die = grinders

despite already building a -6a I = still have=20 problems with the die grinder. I have yet to figure out what = makes it=20 jump around and what makes it cut nicely. I am using the very = open tooth=20 die that won't clog up when cutting AL. what is the correct feed = direction, speed, etc... I should be trying?

Kevin Lane Portland, = OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(browse=20 w/ internet explorer)

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