[TheForge] Speaking of hammers

[theforge@mailman.qth.net]

The kinyon style hammer has a pneumatic switch that changes the 
direction of the tup at the bottom of its stroke. This could be made to 
move with the treadle, thus changing the strike length according to how 
far depressed the treadle is.  At least I would think so, but I may be 
missing something.      

Charles


Andy Vida wrote:

>Also, not knowing that much about pneumatics, I have now long wondered
>if it's possible to have a control system that traces motion of the
>control device precisely in the ram.  What I mean is this: as the
>control device (let's just say it is a treadle to keep it simple) is
>depressed, the tup would advance that precise amout, proportionally
>speaking.  So if the treadle had a 4" travel and the tup 40", again
>to keep it very simple, and I depressed the treadle 2", the tup would
>advance 20", or half its travel.  I know this can be done hydraulically,
>e.g., when setting the depth of an implement suchas a plow in the
>ground,
>the tractor has a lever whose length of travel represents the range of
>depth the implement can be set to.  Can it be done pneumatically?  I
>suspect it can, but would like to know how.
>  
>