[AT] Now Ralph Video -- disc brakes

[charlie hill]

I understand that Ron but those taller tractor tires aren't turning 1000 rpm 
and trying to stop
a 8,000 lb x 90 ft/sec load either and they aren't stopping that load 
against asphalt.  All I want to
do is stop one wheel turning about 4 rpm with a 2500 lb x 6 ft/sec load in 
soft dirt while allowing the
engine hp to continue pushing the other wheel unimpeded.

Don't check my math it's a guesstimate but the point is the same, while the 
torque amplification
may be a lot greater on a tractor the overall torque load that the brake is 
stopping is a lot less
and with a lot less heat than the brake rotor is designed to handle.  I've 
seen trucks on the highway
running tires about as tall as the ones on a D-14 A-C and the D-14 isn't 
running 60 mph and doesn't
weigh 8000 lbs.   Take the load times the speed and calculate the HP 
required to stop it, then back out
the rpms of the wheel and I think we will find that the torque load on that 
brake assembly is a lot less on the D-14
than it would be on the truck it's designed for.  I may be wrong.  I don't 
feel much like accurately working it out right now.

To my mind the critical part is fabricating and attaching a mounting bracket 
for the disc caliper that is up to the task.
I'll have to do some studying on the possible mounting locations on the 
tractor axle to figure that out.
It really doesn't much matter.  I doubt that I'll ever do it.  It's just a 
bench engineering exercise.

Charlie



-----Original Message----- 
From: rdhaskell at juno.com
Sent: Friday, December 28, 2012 6:37 PM
To: at at lists.antique-tractor.com
Subject: Re: [AT] Now Ralph Video -- disc brakes

Hi Charlie.  The problem is on a truck you have tires that are maybe 31"
tall, and on a tractor you have tires 5' tall.  The mechanical advantage
goes to the tire .  Even putting over size tires on a car diminishes the
breaking capability, and you are talking just a few inches taller.

Ron Haskell
rdhaskell at juno.com
Riverside, California USA
http://picasaweb.google.com/RonHaskell

On Fri, 28 Dec 2012 17:49:44 -0500 "charlie hill"
<charliehill at embarqmail.com> writes:
> Could be Tom but it seems to me that disc brakes from the front of a
> 2500 or
> 3500 series truck
> should be able to handle a 4000 lb tractor with no problems.  I
> guess the
> only way to find out is to try it.
>
> Charlie
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