[TheForge] Trip Hammer Report (Longish)

[schade at acegroup.cc]

On Dec 7, 2007, at 10:43 AM, Washington, Aubrey O. wrote:

> Andy and Bob,
>
> On Sid's website there is an instruction sheet that was apparently 
> sent out from the factory with new LGs.  It says, among other things:
>
> "When hammer leaves factory, crosshead is set so that dies are 
> approximately 1" apart when crank pin is at lowest center.  This is 
> approximately the correct adjustment for general work from nothing up 
> to 2" diameter or 3" wide flats when place under hammer edgewise."
>
> Based on your experience, it sounds like you may not agree with this.  
> Correct?  You find that about 1 1/2" from the top die to work piece is 
> better?
>
> Aubrey
>
> __


I agree that it's a good starting point.

I also think that the speed you are running your hammer (more or less 
pressure on the treadle) has a relationship to the fluttering.  The LG 
spring compresses both when the ram goes up and when it goes down but 
if you try to go full speed the linkage doesn't have time to react to 
one force before another is applied. So it gets confused and flutters.

Try going slower and see if the fluttering goes away.

I just looked at mine and the top die is about 1" from the bottom die 
when the crank is all the way down. I don't move it very often.

Bob