[TheForge] Little Giant / pulley / rpm / ???

[Bob]

     Many years ago at S.O.F.A. I asked Clifton Ralph how fast a power 
hammer needed to run. I was building a line shaft driven shop.
After about a 45 minute lecture about everything except my question he 
asked me "How fast do you want to hammer?" Class over.

Bob Willman
The Eagle's Anvil
Bowling Green, Ohio
WB8NQW

Freedom is a fragile thing and is never more than a generation
away from extinction. It is not ours by inheritance; it must be
fought for and defended constantly by each generation, for it
comes only once to a people. Those who have known freedom and
then lost it have never known it again.

Ronald Reagan

On 3/19/2015 11:09 AM, David E. Smucker wrote:
> Dave,  I believe this number to be correct,  It is slow for a 25 # Little
> Giant -- most were set up to run between 350 to 400, 375 being a good
> number.  Remember these hammer were built mostly for drawing out and for
> drawing out plow points as their bread and butter job.  The high beats per
> minute work great with the lower weight hammer of the 25 #.  Force = 1/2
> mv^2.  So while the mass is low in the 25# LG the velocity is high and it is
> squared.  Ever see Jerry Darnell hammer -- light hammer very high beats per
> minute, really moves the metal.
>
> Speed the hammer up.
>
> Dave Smucker
> Brasstown, NC
>
> -----Original Message-----
> From: TheForge [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Bob
> Sent: Wednesday, March 18, 2015 11:24 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] Little Giant / pulley / rpm / ???
>
>       1725 divided by 5 = 345
>       345 times 8 = 2760
>       2760 divided by 10 = 276
>
> Bob Willman
> The Eagle's Anvil
> Bowling Green, Ohio
> WB8NQW
>
> Freedom is a fragile thing and is never more than a generation away from
> extinction. It is not ours by inheritance; it must be fought for and
> defended constantly by each generation, for it comes only once to a people.
> Those who have known freedom and then lost it have never known it again.
>
> Ronald Reagan
>
> On 3/18/2015 11:06 PM, Dave Mudge wrote:
>> Good evening kids,
>> I am setting up a nice 25# Little Giant hammer and i have some questions.
>> This hammer came with a 1-1/2 hp. motor connected to a speed reducer.
>> The motor turns at 1725 rpm, connected to a reducer that is 5:1. The
>> output of the reducer is connected to an 8" flat belt pulley and the
>> hammer has a 10" flat belt pulley..........
>> Of course the question is, How fast will the hammer be turning if I
>> use this set up?
>> I don't recall ever seeing a hammer set up in such a fashion, on the
>> other hand I haven't seen everything by a long shot. So why do you
>> think that the hammer was set up like this?
>> In the book, "The Little Giant Powerhammer" by Richard Kern it says
>> that the speed should be around 375 rpm.
>>
>> Thanks,
>> dave m
>>
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