[TheForge] air hammer

[Walter Mullett]

It mostly does come down to mass.  Mass absorbs inertia (vibration) and
that's why the heavy anvils help.  A mass of concrete can do the same.

But you also have the best mass available to you in the ground below.
Unless you are sitting on a rock ledge, you can reduce the vibration by
isolating from your structure.  That means DO cut the floor and put in an
isolation material.

Of course if you are on a rock ledge and if you anchor to that, you might
break some windows a couple of miles away.  That happened in the Cleveland
area years ago when they had some heavy hammers that were somehow building a
rhythm that was transmitted through the rock bed below.  They "broke
cadence" to solve the problem

Walt

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of Ries Niemi
Sent: Tuesday, March 22, 2005 8:59 PM
To: Sponsored by ABANA
Subject: Re: [TheForge] air hammer


On Tuesday, March 22, 2005, at 05:48 PM, Andrew Vida wrote:

>
>
> Silver Creek Pottery wrote:
>> How big is the hammer? I've found anvil to hammer weight ratio to be 
>> very important.The bigger the anvil , the less vibration.
>
> 	Isn't the usual ratio about 5:1 anvil to falling weight?
>


My chinese airhammer, which is basically a copy of a chambersburg, has 88lb
falling weight, and a 1056 lb anvil- so that is a 12:1 ratio, which I think
is ballpark for the oldies but goodies like nazels, chambersburgs, eries and
the like. 12:1 up to 15:1 is what I have heard.
What is the ratio on a 25lb little giant?

ries

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