first, thanks for your time guys, and yeah the rate of the spring it's pretty much defined as that Force needed to compress 1 unit of distance.
could you please give me acces to that data, dia, lenght, and coil count, I could work with that, but sadly I don't have access to that book, I live in Chile so...it's a big distance, and those books are kinda hard to get in here.
I might have an idea of what it's needed for the spring, but I'm not completely sure and I've got nothing to compare at hand, so any info would be awesome
as far as my simple reasoning goes:
the spring needs to absorb the energy given the momentum of going from down to top the stroke, I've managed the calculate the speed of the ram when running at 3bps.
at around 3.4 m/s. and the distance that I've allowed the arms of the dupont to move is pretty much 8 mm each so, 16 mm of compression, runnin math on that the kinetic energy of the Hammer would be roughly Ek=0.5*m*v^2 = 39 675 [N*mm] [My design is for a small hammer btw, 15 kg or 33 lbm]
so I know that the energy of the spring is given by Es=k*x^2 where k is the rate and x it's the compression.
so doing the math 39 675 N*mm = k*(16^2) gives me a of 154 N/mm or aroun 880 punds/inch
the problem with that is that I've got nothing to compare and on youtube I've seen the stiffest springs to the softest working kinda fine, obviously the stiffer the spring the higher the rpm without resonance on the machine, so, kinda safe, but I don't really have something to compare atm
as far as I've seen the Little giant has a xxxxxxx stiffer spring, given that it almost does not move anything
BTW. sorry for using S.I. units, I use to work more with that than freedom units.
so that would be everything I have, I'm literally throwing shots in the dark right now and that's pretty much the step I need to finish the calculation memory of the hammer