[AT] Now Ralph Video -- disc brakes

Richard Fink Sr rfinksr at verizon.net
Sat Dec 29 11:07:17 PST 2012


Around here Charlie it is just another winter day. We got 8 total wen-thur 
and 3-5 on it today. Yea it is pretty but i am ready for it to melt into the 
ground.

Second note Dean i don,t know if i would take such a nice tractor out in the 
snow.
R Fink
PA


----- Original Message ----- 
From: "charlie hill" <charliehill at embarqmail.com>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Saturday, December 29, 2012 11:19 AM
Subject: Re: [AT] Now Ralph Video -- disc brakes


> Thanks Richard,
>
> As I said, I probably will never try it but if I do I'll have it
> all built out on paper and know what I'm getting into.
>
> I had about all of your snow  I wanted Wed. morning!
> Glad it's you and not me!  I averaged 33 mph from Hagerstown, MD
> to Warrenton VA and the last 30 miles or so I was running 40 to 50.
> The leg down I-81 to Winchester VA was one I'd just as soon forget.
> 2wd cars with slick tires and tractor trailers as thick as fleas don't mix
> well.  Thank goodness for 4wd.
>
> Charlie
>
> -----Original Message----- 
> From: Richard Fink Sr
> Sent: Saturday, December 29, 2012 10:42 AM
> To: Antique tractor email discussion group
> Subject: Re: [AT] Now Ralph Video -- disc brakes
>
> Charlie i tried that back 30 years ago on an old case 310 with loader and
> hoe. Took rotors and mounts off a F250 and put on it  they worked can,t 
> say
> as good or worse that original never had. Could not get the pads i needed
> for original brakes. It was a real pain two master cyl. and hook up.
> would never try that again.
> R Fink
> White snowy PA
>
>
>
> ----- Original Message ----- 
> From: "charlie hill" <charliehill at embarqmail.com>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Friday, December 28, 2012 7:08 PM
> Subject: Re: [AT] Now Ralph Video -- disc brakes
>
>
>>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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