[TheForge] drop hammer

[Chris Kilpatrick]

I have been toying with the idea of taking a spring fuller and attaching a rod to the spring side that drops down to a pedal; instant treadle hammer of a very limited sort.

-Chris K.

----- Original Message -----
From: "Bruce Freeman" <FREEMAB at pt.fdah.com>
To: theforge at mailman.qth.net
Subject: [TheForge] drop hammer
Date: Mon, 03 Oct 2005 14:20:46 -0400

> 
> What with all the discussion about cheap power hammer, what about a 
> drop hammer.  Okay, traditionally these were run from a water 
> wheel, but the were later motorized with steam engines, no doubt.
> 
> What I'm envisionaing is a classic drop hammer, heavy head on an 
> oak beam, pivoted on the far end  - low tech.  Then come up with an 
> appropriate modern "lifter".   One problem with traditional 
> cam-type lifters was the friction on the cam.  Maybe a modified cam 
> using a steel wheel rolling on the bottom of the beam would work.
> 
> Rough calculations suggest this is quite feasible.  Assume a 3' 
> beam with a 100# head, and a double-wheeled cam (lifter) halfway 
> along the shaft (none of which details matter).  Now assume a 4" 
> cam "stroke" leading to an 8" hammer motion (based upon foregoing 
> proportions).  Neglecting friction (!) I calculate this hammer 
> could be run at ~150 blows per minute with one-half horsepower.  
> Now electric motors of 1 HP are commonly available cheap, and gas 
> motors of a few HP are junked all the time.  Electric motors run 
> either ~1700 or ~3400 RPM, meaning a 10:1 or 20:1 speed reduction 
> would be needed, and this could be accomplished with a gearbox, 
> belts and pulleys or sprockets and chains with not too much trouble.
> 
> So there you go.  A "novel" concept in a junk-yard hammer.
> 
> Bruce
> NJ
> 
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