Larry, Brian and others,
I wouldn't call Brian a hotdog. You or I have never seen him machine
anything. He may be quite competent, maybe more so than your brake guy. I
would agree that you could get taper, although I think you have it backwards
(the outer would be thicker). However, if light enough cuts are made and
repeated without advancing the tool, I see no reason why it couldn't come
true with no taper, it would just take longer than your brake guy would be
willing to spend. 2nd corilary to Koch's rule(Roger, not Bill) states "That
one can be as crude or as finise as one wants when it comes to one's own
car." This all has to do with cost and finding someone affordable that is
more qualified than yourself to do the job. As for a brake shop, most
chamfers I've seen on x-drilled rotors are about a 32nd deep and if your guy
is going to make them disappear, I think I'd rather let some "hot dog" do
the job, if all I'm trying to accomplish is smooth them up.
Roger
>From: lwdent <lwdent@fwi.com>
>Reply-To: lwdent <lwdent@fwi.com>
>To: Charles Christ <cfchrist@earthlink.net>
>CC: N <twobees@sprynet.com>, vintage-race@autox.team.net
>Subject: Re: Cross-drilled Brake Rotors - Can they be turned?
>Date: Tue, 14 Aug 2001 11:00:36 -0500
>
>OK, now that we have all pooled our ignorance, here is the straight
>scoop on drilled rotors and turning same, right from Brake Materials and
>Products.
>
>No problem in turning (cutting, dressing) any drilled rotor. If the
>drillings have a champher, as some do, you will loose the champher.
>
>To the hot dog machinist that wanted to do it in his lathe, let me
>stress that this cannot be done with proper accuracy.
>
>A brake lathe cuts both sides of the disk at once so that forces are
>equal on both sides and the disk will not flex and cause a taper. This
>will happen if you cut one side, the cut the other. The disk will be
>thinner on the outside with a taper on BOTH surfaces.
>
>I owned an automobile machine shop for many years. Just revivified all
>that with Scott Bethke at Brake Materials.
>
>Larry Dent
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