Re: OEM rotors for 1998 M3


"Fred W" <malt_hound@xxxxxxxxx> wrote in message news:WdedncRfhpVjQ8jbnZ2dnUVZ_urinZ2d@xxxxxxxxxxxxxx
Jeff Strickland wrote:

"mcquarrie" <00derek@xxxxxxxxx> wrote in message news:1180029010.772812.119740@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

- Show quoted text -


So you bought cross-drilled and slotted rotors. Then you had them
machined true. Where did you have them machined? Obviously not at your
local Kragen. I'm confused.


Sorry.

I had to take them to a machine shop and get them turned on a flywheel grinder. Normally, rotors are turned on a lathe, but the slots and holes cause the cutting tool to bounce, so I had to get them ground flat (true) with a grinder that turned the rotors on a turntable while polishing them with a spinning grindstone at the same time.

Just one more in a long list of reasons *not* to get cross drilled or slotted rotors.

I buy rotors that are true out of the box. Saves on trips to the machinist.



As true as that is, I did score a second set of rotors for free that are in perfect condition after I had them turned too.

I don't get why the seller didn't turn the parts before he shipped them; it only takes a few minutes, and he spent more on free shipping and the free parts than the minor machine work would have costed.







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