The Mudcat Café TM
Thread #9559 Message #62354
Posted By: j0_77
11-Mar-99 - 12:26 AM
Thread Name: What did John Henry mean?
Subject: RE: What did John Henry mean?
Hmmm fascinating - welll agreed if the steel is horizontal one 'might' throw the hammer in the same plane - 'but' you don't gotter do it that way. Arc ? A mechanical hammer works like this - the air / solenoid pushes the 'heavy' casing out - gravity causes it to recoil back. In situations where the 'job' is horizontal the operator has to lean against the hammer handle to create a force sufficient to 'bore/drill' etc., Now if the hammer did force a recoil - all that it would achieve is a jumping motion so it's back to the drawing board. Pulling on the handle of the hammer adds very little 'in my opinion' to the work done at impact. Analysis of the physics USING Newton's model simply begs the question. There is a great deal more happening in these phenomena than Newton ever dreamed. It is simply dumb to add 'KE' to the hammer head in most cases for reasons already listed above. You waste your energy on making a louder sound - etc... Also sometines all it achieves is to compress the steel and make it heat up. Because we are here talking about the real world and not some mathmatical model, everything is 'probably' true and in these cases there are 'limits' within which these conditions yeild the most efficient result. Simply a 20lbs hammer may not be the best because it is 'bouncing' off the job. A 30lb may be too heavy because it is compressing the steel. The ideal wt may be 25lbs for example and only if that is dropped! not thrown - To throw a 15lb hammer to consistently get the effect of the 25lb is both very difficult and tiring. Why bother when you could use the 25lb.