(Just for fun, we're reprinting the original content for a project we did in our early days, late 90's and early 2k's. Enjoy)
(by Colin Moritz)
What seems to be rage these days? Electric Autocockers! But with prices ranging from "out-of-my-price-range" to "waaay-out-of-my-price-range", not just everybody can have one-including myself.. until now. The basic operation of an electric Autococker is fairly simple. Your trigger moves a switch, which feeds juice(via batteries) to some sort of a solenoid which pulls the sear, firing the marker. Then, after the firing is commenced, another solenoid (electro-pneumatic valve) is activated which controls the recocking mechanism. The whole tricky part to all of this is timing it all out to make it function properly and smoothly. Since the input(trigger) and the outputs(the two solenoids) are all electric now, everything can easily be controlled by a chip or some other timing circuitry. OR you can keep all the timing mechanical by making the two actions (fire/recock) interact with each other.
The second approach is what I used to build my home-brewed EAC. It is a very simple, cheap electric conversion, but it inherently does not have all the bells-and-whistles as the all-electrically-timed rout can have. There are only two drawbacks to my approach. First, you only have one fire mode.. Semi. But since this is the only legal mode of fire in tournaments, its not really that bad. The second drawback is the fact that it cycles directly with the trigger, just like non-electric Autocockers. But since non-electric Autocockers can shoot just fine, this is not really much of a problem either.
"So why bother?!" you may ask.. well, to shoot an Autococker with a trigger pull of 1mm is pretty dang nice. That also allows consistent shots because there is almost no marker body movement as you "stroke" the trigger. Also, with a little practice, you can rap some pretty impressive BPS out. I have measured mine at 14bps. I know its not all about BPS, but it sure is fun, and nice to have when needed!! :)
On to the details..
The test-bed of my project is a 32* Pro Autococker with the Bob Long "bloated" grip. At first I didn't like this grip very much, but it provided some extra room inside the grip to mill and fit stuff in.. which turned out wasn't necessary, but the extra bulk gave me a sense of security while milling. I started off by building a combo manifold/microcylinder block to mount to a very small 3-way electro-pneumatic valve, which was all mounted in the grip. The micro-ram pulls a linkage connect to the sear. Then, on to the front block of the Autococker, I made another manifold which mounted and provided air to a regular electro-pneumatic 4-way valve, and also split air off to go to the 3-way in the grip. This manifold was fed air from the output of the Rock reg. Back inside the grip, where the micro-ram is pulling on the sear, I mounted a micro switch (angel switch, same as trigger) which was tagged when the sear was pulled down. This switch feeds power the 4-way on the front block. Everything is run off of the hopper batteries.
So, operation is very simple. Pull trigger(switch1), feeds power to 3-way inside grip which pulls the sear(firing marker), and tagging the second switch(switch2). This second switch then powers the 4-way on the front block, causing the back block to move back. As long as you hold the trigger in, everything stays in this state(just like a regular AC). As soon as the trigger is released, power is lost the 3-way in the grip, causing the sear to move back up, releasing the second switch, causing the 4-way to move the back-block forward again.
It may not be the best setup, or the most efficient, but it gets the job done on the field- and pretty dang well most of the time⦠:)