David,
I find it hard to accept your concept of slop being removed by the set
screw(s). Are you saying when the vehicle is being driven the set screw is
the item that holds the braking forces applied to the drums against the
mass/momentum of the car when accelerating/braking? If there was slop
wouldn't there be wear against the thread area of the set screw where it
comes through the brake drum? The diameter of the screw is insufficient to
prevent slop and as they don't wear there can be no slop. Any slop is
restricted to the studs/drum interface when the lug nuts are tightened. But
how many studs are there where you have seen wear or brake drum holes
ovalized due to wear due to slop?
However, I must admit to quiet thoughts the set screws do locate the drum in
its correct centralized position and always use them. 'Mr Lockheed brake
component manufacturer' says differently. As he designs, makes, fits and
services the damn things and I've not seen the wear patterns your slop would
create, I've got to accept his version.
All the best,
Guy R Day
----- Original Message -----
From: "David Lieb" <dbl@chicagolandmgclub.com>
To: "Spridgets" <spridgets@autox.team.net>
Sent: Tuesday, September 12, 2006 1:11 PM
Subject: Re: hood and drums
>> The retaining set screw in a brake drum really is a redundant item. In a
>> brake designers' head many years ago was the thought that a drum may fall
>> off when you remove the road wheel. We all know it doesn't, in reality
>> we all know that at times it is a real pain in the ass to remove both the
>> screw and the drum. However, the sole reason for it being there is to
>> hold the drum in place when you remove the road wheel and it serves no
>> other purpose. > When the wheel is on and torqued up it is doing nothing
>> at all.
>
> Yes, once the wheel is torqued down, they do nothing. However, remember
> the tolerances we are dealing with here. Do you have any slop between your
> lugs and the holes in your drum? I do. How do I get the drum to center
> consistently? How about using a pair of countersunk screws? Works for
> me...
> David Lieb
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