Brake Drum Machine Screws

E

Ed Price

Guest
I have never before encountered brake drums that are mounted like the Amphi
drums. What is the purpose of the three small flat-head machine screws that hold
the drum to the spindle, independent of the 5 wheel studs? Maybe this is typical
of German cars?

Ed
El Cajon
67 Rust Guppy


[Non-text portions of this message have been removed]
 
C

capon23@aol.com

Guest
Ed,
I had a Porsche 914 and i remember that it had wheel studs that screwed
through the drum and into the axle rather than lugnuts...
The 3 screws insured that the drum would stay in place...
On Amphicars i think it is designed that way to make sure you don't have the
drum cocked to one side and then tighten the lugs which could lead to trouble,
also the lip on the axle in the middle that the drum sits on is not as deep
as a typical American rear axle...

Just a note--- alot of American cars with drum brakes also use clips that are
placed on the wheel studs to keep the drum in its perspective place...

John Cigarman Capone


[Non-text portions of this message have been removed]
 
W

WB6WSN

Guest
----- Original Message -----
From: Ed Price
To: Amphicar List
Sent: Wednesday, January 07, 2004 2:06 AM
Subject: [amphicar-lovers] Brake Drum Machine Screws


I have never before encountered brake drums that are mounted like the Amphi
drums. What is the purpose of the three small flat-head machine screws that hold
the drum to the spindle, independent of the 5 wheel studs? Maybe this is typical
of German cars?

Ed
El Cajon
67 Rust Guppy



Umm, replying to my own question, as I haven't seen any replies. Anybody have
any idea why our Amphi drums are designed this way?

Ed
El Cajon
67 Rust Guppy


[Non-text portions of this message have been removed]
 
R

rogtwo@aol.com

Guest
Ed,

I always thought having those brake drum screws was the norm. I was
surprised when I first saw drums without them. This is probably because I have
mostly
worked on Japanese and German cars.

Anyway, I suspect the answer to your question is simple: to some engineers
the screws seemed like a good idea, whereas to other engineers they seemed like
an unnecessary expense.

Others here have given good guesses as to why some engineers would have
chosen to use screws, but let me add one more possibility -- tradition. I would
guess that on early cars with wooden wheels (or even on horse drawn carriages),
that the brake drums had there own attachment bolts. Once this pattern of
independent bolts is established, it's hard for an engineer to say "Gee, we
don't
need any bolts to hold the brake drum on". I can just imagine the possible
logic against eliminating the bolts:

What if the wheel should fall off (not completely unheard of)? If the brake
drum doesn't have it's own bolts, then the drum could fall off too, leading to
a complete loss of brakes!

Is this a realistic concern? I doubt it, but if nobody is pushing you to
eliminate the bolts, do you want to be the engineer that suggests that the BRAKE
DRUM doesn't need to be screwed on?

Roger
White '63
Seattle

In a message dated 1/16/04 3:41:13 AM Pacific Standard Time, wb6wsn@cox.net
writes:
----- Original Message -----
From: Ed Price
To: Amphicar List
Sent: Wednesday, January 07, 2004 2:06 AM
Subject: [amphicar-lovers] Brake Drum Machine Screws


I have never before encountered brake drums that are mounted like the Amphi
drums. What is the purpose of the three small flat-head machine screws that
hold the drum to the spindle, independent of the 5 wheel studs? Maybe this is
typical of German cars?

Ed
El Cajon
67 Rust Guppy



Umm, replying to my own question, as I haven't seen any replies. Anybody have
any idea why our Amphi drums are designed this way?

Ed
El Cajon
67 Rust Guppy


[Non-text portions of this message have been removed]
 
A

a_colo_native

Guest
> I have never before encountered brake drums that are mounted
like the Amphi drums. What is the purpose of the three small flat-
head machine screws that hold the drum to the spindle, independent
of the 5 wheel studs? Maybe this is typical of German cars?


Ed, I meant to reply sooner! Sorry!

The 3 screws center the drums to the spindle. If you notice the
drums fit slightly loose on the studs so w/o the 3 screws the drum
will be a bit off center. This would cause uneven wear on the brake
system not to mention the surging feeling when applying them.

John Bevins
RMA
 
C

craig

Guest
RE: Re: Brake Drum Machine Screws

John, I'm going to have my drums turned soon. Do I need to make sure
they center them on those three screw holes rather then the lug stud
holes? Or is the difference not enough to matter.
Craig in Alaska

-----Original Message-----
From: a_colo_native [mailto:colo_frontrange@netzero.net]
Sent: Friday, January 16, 2004 7:57 AM
To: amphicar-lovers@yahoogroups.com
Subject: [amphicar-lovers] Re: Brake Drum Machine Screws


> I have never before encountered brake drums that are mounted
like the Amphi drums. What is the purpose of the three small flat-
head machine screws that hold the drum to the spindle, independent
of the 5 wheel studs? Maybe this is typical of German cars?


Ed, I meant to reply sooner! Sorry!

The 3 screws center the drums to the spindle. If you notice the
drums fit slightly loose on the studs so w/o the 3 screws the drum
will be a bit off center. This would cause uneven wear on the brake
system not to mention the surging feeling when applying them.

John Bevins
RMA



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[Non-text portions of this message have been removed]
 
A

a_colo_native

Guest
> John, I'm going to have my drums turned soon. Do I need to make
sure
> they center them on those three screw holes rather then the lug
stud
> holes? Or is the difference not enough to matter.


Craig,

The best way is via the 3 scrw holes, but most equipment will not
be set up for that. Most will use the center hole, which is fine.

John
RMA
 
M

markr132001

Guest
Craig,

I remember having mine resurfaced. I was very insistant that they
did not cut, and cut until they thought things were right. Just have
enough taken off to make a clean surface, it is easier to cut deep
but drums are expensive. Most of what comes off is glazed surface
and just a trim is all you need. I think the 3 screws are cool and
unique. I sure was surprised to find them the first time.
Getting ready to watch the Barrett-Jackson auction this month.
Always gets the juices flowing.
Mark

--- In amphicar-lovers@yahoogroups.com, craig <alaskanamphi@g...>
wrote:
> John, I'm going to have my drums turned soon. Do I need to make
sure
> they center them on those three screw holes rather then the lug
stud
> holes? Or is the difference not enough to matter.
> Craig in Alaska
>
> -----Original Message-----
> From: a_colo_native [mailto:colo_frontrange@n...]
> Sent: Friday, January 16, 2004 7:57 AM
> To: amphicar-lovers@yahoogroups.com
> Subject: [amphicar-lovers] Re: Brake Drum Machine Screws
>
>
> > I have never before encountered brake drums that are mounted
> like the Amphi drums. What is the purpose of the three small flat-
> head machine screws that hold the drum to the spindle, independent
> of the 5 wheel studs? Maybe this is typical of German cars?
>
>
> Ed, I meant to reply sooner! Sorry!
>
> The 3 screws center the drums to the spindle. If you notice the
> drums fit slightly loose on the studs so w/o the 3 screws the drum
> will be a bit off center. This would cause uneven wear on the
brake
> system not to mention the surging feeling when applying them.
>
> John Bevins
> RMA
>
>
>
> THE AMPHICAR-LOVERS LIST
> ~~~~~~~~~~~~~~~~~~~~~~~
> Before posting requests for information, please check the List
> Archives:
> http://www.escribe.com/automotive/amphicar/search.html
> For more information about this List and other available services
> visit:
> http://groups.yahoo.com/group/amphicar-lovers/
> To UNsubscribe from this List, just send a blank email to:
> amphicar-lovers-unsubscribe@yahoogroups.com
> Any other issues may be addressed to the List owner (Mike Israel)
at:
> amphicar770@y...
> This list is provided as a free service. Please support our
sponsors
> at:
> http://www.growerflower.com/default.asp?id=41762
>
>
>
>
> _____
>
> Yahoo! Groups Links
>
>
> * To visit your group on the web, go to:
> http://groups.yahoo.com/group/amphicar-lovers/
>
>
> * To unsubscribe from this group, send an email to:
> amphicar-lovers-unsubscribe@yahoogroups.com
> <mailto:amphicar-lovers-unsubscribe@yahoogroups.com?
subject=Unsubscribe>
>
>
>
> * Your use of Yahoo! Groups is subject to the Yahoo! Terms of
> Service <http://docs.yahoo.com/info/terms/> .
>
>
>
>
> [Non-text portions of this message have been removed]
 
W

WB6WSN

Guest
Re: Re: Brake Drum Machine Screws

----- Original Message -----
From: a_colo_native
To: amphicar-lovers@yahoogroups.com
Sent: Friday, January 16, 2004 8:56 AM
Subject: [amphicar-lovers] Re: Brake Drum Machine Screws


> I have never before encountered brake drums that are mounted
like the Amphi drums. What is the purpose of the three small flat-
head machine screws that hold the drum to the spindle, independent
of the 5 wheel studs? Maybe this is typical of German cars?


Ed, I meant to reply sooner! Sorry!

The 3 screws center the drums to the spindle. If you notice the
drums fit slightly loose on the studs so w/o the 3 screws the drum
will be a bit off center. This would cause uneven wear on the brake
system not to mention the surging feeling when applying them.

John Bevins
RMA


John:

I hadn't noticed that, but that sounds like you have hit on the reason!

Ed
El Cajon
67 Rust Guppy


[Non-text portions of this message have been removed]
 
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