On Tue, Jul 27, 2010 at 10:50 AM, BenT Syncro <syncro@gmail.com> wrote:

Most drums warp in the middle where it touches the hub. It would take too
> much machine work to chase that. Checked that area to see if there is any
> warpage there.
>

I wondered about that, as the metal is very thin there, but I thought the
wheel clamping it to the hub would take care of things. I imagine warpage
here could wreak havoc with the lathe though? Still not sure I want to try
machining these crappy things, so I've contacted AutohausAZ about a return.

>
> Sometimes it's not the drum or the hub. A bad rear bearing can cause the
> hub to wobble and make it feel like a warped drum. With the rear wheels off
> the ground, try to move side to side and check for free play. If it wobbles
> by hand, it can pulse when you drive.
>

Bearings are ok, and the problem goes away with the old drums back on...

>
>
--
Shawn Wright