I've never heard of a vintage group that wouldn't allow you to cross-drill
rotors. As far as turning them goes, I wouldn't hesitate to put them on my
lathe and turn them. It's a simple interrupted cut, and that's very common
in just about all machining. No need to go to CNC, just don't take too
much feed and depth of cut.
Now, the idea of turning them in the first place I'd question. I'd want
drilled rotors to be as close to new thickness as possible, since the holes
do create stress risers that can promote cracking.
Brian
At 11:03 PM 8/13/01 -0400, Don Queen wrote:
>What vintage group is allowing cross drilled rotors? - I wanna join.
>
>Don Queen
>
>-----Original Message-----
>From: owner-vintage-race@autox.team.net
>[mailto:owner-vintage-race@autox.team.net]On Behalf Of Charles Christ
>Sent: Monday, August 13, 2001 3:15 PM
>To: N; vintage-race@autox.team.net
>Subject: Re: Cross-drilled Brake Rotors - Can they be turned?
>
>
>norm,
>
>the rotor lathes i'm familiar with use a tiny hardened bit that machines the
>rotor by flaking off tiny chips leaving a (what looks like a concentric set
>of circular groves) spiral grove pattern on the surface. i can understand
>how a brake specialist could say that. the tool bit would catch evry
>drilled hole and either break the bit or at least damage the bit. now if
>you know someone with a machine shop that could set up the rotor and cut the
>surfaces with a CNC machine i think that might work. but! the set up
>charges at a machine shop may end up costing as much as new rotors by the
>time you get 2 rotors resurfaced? that is why i reccomend you find a friend
>who works with one of these machines and get the job done that way. my
>friend who is a machinist is about 5 hours away. but he gets all my wierd
>"you want me to do what???" stuff. there are some teriffic local shops
>here but i just can not bring myself to ask them to do what my friend
>does.... let alone what they would charge.
>
>chuck
>
>----- Original Message -----
>From: N <twobees@sprynet.com>
>To: MG Digest <mgs@autox.team.net>; Vintage Race Digest
><vintage-race-digest@autox.team.net>
>Sent: Tuesday, August 14, 2001 1:28 AM
>Subject: Cross-drilled Brake Rotors - Can they be turned?
>
>
> > My cross-drilled rotors are pretty tatty. So, I went to a local brake
>shop
> > today & the manager said cross-drilled rotors can't be turned.
> >
> > Spoke to another MG guy & he believes they can. Logically, I don't see
>any
> > reason they couldn't effectively be turned unless the grinding stones of
>the
> > turning machine are smaller than the holes in the rotor.
> >
> > I'm open to suggestions. BTW, Moss now has rotors with BOTH
>cross-drilling
> > AND slots for $150. (But, they aren't cryogenically treated. Hey, Kelvin
> > how about that too?)
> >
> > Norm Sippel
> > '66 MGB
Brian Evans
Director, Canada
MCI Wholesale Internet Services
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