Blow forward Breech Concept Redesign
Posted: Wed Feb 11, 2009 9:50 pm
Okay, so I really like Jack's original blow-forward design, even if he doesn't, but it has a few flaws.
First of all, very few people are as in love with epoxy as JSR. I personally stay very far away from the stuff. So to redesign it, it needs the plugs and piston to be made out of something else... PVC rod. 1 inch PVC rod It makes a perfect piston in a 60 cc syringe without having to be filed ore sanded. McMaster is full of the stuff. I have personally ordered it several times.
Secondly, If the power needs to be increased/decreased, the plugs need to be removable, which again means no epoxy... Instead, the plugs will be held in place with screws, but to be airtight, I will add a few o-rings to the mix.
Lastly, the design he made uses two holes in one of the plugs. One for a rod, and another for the air. This makes it hard to add the o-ring and is well, kind of ugly. If the rod was simply a tube with epoxy on the end, it would do the same thing right? Well if we add holes in the side of the tube, air can flow through right? So if you look at the paint diagrams i made, you can see that by boring a hole in the plug for the tube, and a bigger hole halfway through for the air inlet (like a 1/8 inch nipple) you can do the same thing, only neater and more appealing.
Hope you all enjoy
First of all, very few people are as in love with epoxy as JSR. I personally stay very far away from the stuff. So to redesign it, it needs the plugs and piston to be made out of something else... PVC rod. 1 inch PVC rod It makes a perfect piston in a 60 cc syringe without having to be filed ore sanded. McMaster is full of the stuff. I have personally ordered it several times.
Secondly, If the power needs to be increased/decreased, the plugs need to be removable, which again means no epoxy... Instead, the plugs will be held in place with screws, but to be airtight, I will add a few o-rings to the mix.
Lastly, the design he made uses two holes in one of the plugs. One for a rod, and another for the air. This makes it hard to add the o-ring and is well, kind of ugly. If the rod was simply a tube with epoxy on the end, it would do the same thing right? Well if we add holes in the side of the tube, air can flow through right? So if you look at the paint diagrams i made, you can see that by boring a hole in the plug for the tube, and a bigger hole halfway through for the air inlet (like a 1/8 inch nipple) you can do the same thing, only neater and more appealing.
Hope you all enjoy