Date: 30 Jun 2005 15:11:17 GMT
From: Dave Hinz <>
Subject: Re: Brake Rotors

On Thu, 30 Jun 2005 15:21:20 +0100, Grunff <> wrote: > Dave Hinz wrote: > >>>Avoid drilled rotors, they often develop cracks around the stress risers. >> >> Never heard such a thing, ever. In decades. Got something I could read >> about this phenomenon? It's odd that so many makers would use them if >> they were fundamentally flawed. (the preceding is my gentle way of >> saying "sounds like bullshit to me"). > > I've seen it, but only on "home drilled" ones. In fact, a local garage > has just such a cracked disk on their "interesting failures" shelf. Well... there's home-drilled, and there's home-drilled. If I home-drilled rotors, it'd be on one of my milling machines with an indexing turntable, so it'd probably be different than some guy with his cordless drill. > Possibly the drilling was done in a careless manner which left uneven > holes, I'm not sure. Burrs would probably be a problem, and if they're not clean holes, there's all sorts of places for stress to build up. (thinks...) Uneven distribution of the holes could cause all sorts of interesting dynamic effects, and heat buildup during machining would need to be minimized to do this properly.

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