I've been flooding other threads about it, so I'll just make a new one.
The valve will most likely be a McMaster 1/8" push button. Operating pressure of 260 psi max, unless my fridgy can do more (doubt it).
The part I'm working out is the striker.
I've started the improved drawing... made ammends to the striker length and spring adjustability. But I'm stuck on how to construct the striker such that the weight can be adjusted and a screw can be threaded into the side. Any ideas?
I will be using a 2" long spring, or somewhere around that. These CAD drawings are very precise... but in reality it probably won't be such. This is conceptual so far, so some things will likely change as I start the build.
McMaster part 9657K121 is basically the spring I am aiming for (although I won't be ordering 12 of them

The max adjustment length as you can see is 2.5", so that the spring is only compressed a 1/4" by the 3/4" long striker. This is obviously not enough compression to significantly accelerate the striker, so it will likely never be adjusted to said length. The shortest I can adjust the spring length is 1.75", so that when it is cocked, the spring is 1" long (an estimated max compression length). So, the adjustability will give me full control over the strike strength and power, from lowest to max.
I'm thinking I will first construct the highly adjustable prototype hammer assembly, then once I fine tune it, I will reconstruct some parts with fixed properties, such as weight and length, in an effort to simplify the final product.
Here we can discuss my project. Thanks :occasion5: