Deep Hole Drilling
It goes without saying that the initial setup is everything if the holes being bored in this rectangular piece of billet aluminum are to be aligned precisely where they are required to be once they exit the opposite side of the material.
I just completed the drilling and reaming of a 1" hole through the full 6" length of this aluminum block required for the valve assembly, valve striker, and the striker spring retaining block to be installed in what will be the action for the PCP that I have under construction in my shop.
I also drilled and reamed a 5/8" hole for the bolt assembly that runs parallel to the valving assembly chamber and in alignment with the barrel
. With a connecting port drilled between the two, this will allow air from the air bottle mounted at the rear of the action to be released by the air valve, with the air then being ported to a channel drilled through the bolt, allowing the air to access the pellet loaded in the breech of the barrel.
You might be wondering why I didn't drill the required holes in the drill press, and the reason is because the mill allows for the precision required to place the holes precisely where they are required within a thousandth of an inch.
Again, doing the initial setup took as much time to get everything aligned precisely, as it took to drill the holes.
Click on the photo for a closer look.....