Return-Path: <13brv3@bellsouth.net> Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 613454 for flyrotary@lancaironline.net; Wed, 19 Jan 2005 15:23:16 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050119202247.LSXO2073.imf19aec.mail.bellsouth.net@rd> for ; Wed, 19 Jan 2005 15:22:47 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: Porting tool questions Date: Wed, 19 Jan 2005 14:22:59 -0600 Message-ID: <005e01c4fe64$ab07b410$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_005F_01C4FE32.606D4410" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_005F_01C4FE32.606D4410 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I have a nice new 1/4" shaft, 90 degree die grinder, and would be willing to also buy a straight one if needed (though I don't see why it would be). I've been told the weapon of choice for porting is a carbide bur, but a quick look at McMaster-Carr makes my brain hurt. First, I see Double, and Single cut burs. These are defined as: Double Cut- Cross-fluted pattern removes metal faster, produces smaller chips, allows better control, and gives coarser finish than single cut. Single Cut- For use where more gradual stock removal and finer finishes are required. Sounds like you'd probably start with the double cut, and finish with the single. I'm sure you need to smooth it further than what the single will do, so what do you use for that? Flapper wheels? Polishing compound? Next, there's a baffling array of shapes and sizes of these things. They can be purchases individually, or in sets. My normal temptation is to go for a set, but I usually find that I use 2 or 3 of the items in a set, and never touch the others. If that's the case, I'd be better off to just buy a couple each of the most used shapes. They also have extra long burs, which also seem like they'd be useful. You can see these at http://www.mcmaster.com/ . Put 2470 in the search box, which will take you to that page. At the top, you can advance to the next two pages as well, which also contain 1/4 shank carbide burs. Any suggestions would be most appreciated. With my level of porting skill, I'm convinced I can outperform Tracy. Unfortunately, I don't believe Tracy will let me port his engine :-) Rusty (beware sharp spinning objects) ------=_NextPart_000_005F_01C4FE32.606D4410 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I have a nice new 1/4" shaft, 90 degree die = grinder, and=20 would be willing to also buy a straight one if needed (though I don't = see why it=20 would be).  I've been told the weapon of choice for porting is a carbide bur, but a = quick look=20 at McMaster-Carr makes my brain hurt.

First, I see Double, and Single cut burs.  = These are=20 defined as:

Double Cut— Cross-fluted pattern = removes metal=20 faster, produces smaller chips, allows better control, and gives = coarser=20 finish than single cut.
Single Cut— For use where = more gradual stock=20 removal and finer finishes are required.=20

Sounds like you'd probably start with the double = cut, and=20 finish with the single.  I'm sure you need to smooth it further = than what=20 the single will do, so what do you use for that?  Flapper = wheels? =20 Polishing compound? 
 
Next, there's a baffling array of shapes and = sizes of=20 these things.  They can be purchases individually, or in = sets.  My=20 normal temptation is to go for a set, but I usually find that I = use 2 or 3 of the items in a set, and = never touch=20 the others.  If that's the case, I'd be  better off = to just buy a=20 couple each of the most used shapes. =20 They also have extra long burs, which also seem like they'd be=20 useful.   
 
You can see these at http://www.mcmaster.com/ .  Put=20 2470 in the search box, which will take you to that page.  At the = top, you=20 can advance to the next two pages as well, which also contain 1/4 shank = carbide=20 burs.   Any suggestions would be most appreciated. 
 
With my level = of porting=20 skill, I'm convinced I can outperform Tracy.  = Unfortunately, I=20 don't believe Tracy will let me port his engine :-)
 
Rusty (beware = sharp=20 spinning objects)
    
 
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