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Project 7 Carpet Crawling Creature
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Figure 3-20 Two-liter pop bottle and fur covering
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Figure 3-21 Critter and towing system ready to scare
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Project 8 Universal Critter Launcher
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This version of the furry beast prank takes things to the limit, and will freak out even your most hardened, prank-resistant friends When this prank is in action, your victim won t have time to remember that you, the Evil Genius prankster, is likely behind it, nor will there be time to access the situation In fact, your unsuspecting victims will only have time to duck, cover and scream with fear Because the critter will lurch from the floor directly at the victim instantly when a light is switched on, the victim will only see the rough outline of whatever it was that is now heading directly at his or her face in a real hurry, so the effect is guaranteed to work I call this the universal critter launcher because you can set it up to hurl any small lightweight object into the air, and the mechanics can be made as large as you like There are two parts to this system a spring-activated hinge-launching system and an electromechanical releasing device The two parts must be made to work together, so the amount of spring force you will be able to use will be dependent upon how much force your mechanicalreleasing mechanism can deliver Unlike the previous solenoid projects, this one will demand some mechanical force from the solenoid, so running a 24-volt solenoid from a 9-volt battery is not going to cut it Read the entire project before you start choosing parts so you will understand what will be necessary from the mechanics The main part of this mechanical device is the springactivated launch mechanism formed from one or more springs and a locking gate hinge as shown in Figure 3-22 The hinge and springs can be found at most hardware stores and available in many sizes and shapes For a small launcher capable of hurling a rat-sized beastie from the floor to about 5 feet in the air, a spring with a diameter of about half an inch and a length of about 3 inches should do
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Project 8 Universal Critter Launcher
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Figure 3-22 A gate hinge and a spring
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the trick The hinge shown in Figure 3-22 is about 4 inches in total length just to give you an idea of how large my device was The hinge will be bolted to a wooden base so that it functions in a similar way to a swinging gate The hinge can be locked into position by placing an object between the hole in the latching part and the hinge body The spring will then be placed under the hinge to create a pressure that will make the hinge fly open once released This system is shown in Figure 3-23 Drill a hole through the wooden base for the spring, which is fastened on the underside of the board using a piece of metal with holes drilled at each end I used one of those 90 degree shelf brackets, and hammered it straight as shown in Figure 3-24 The spring could also be bolted directly to the wooden base without drilling the hole, but this would limit the amount of compression on the spring, reducing the amount of travel delivered to the hinge when the releasing mechanism is activated The metal plate holds the spring in place so that it does not fly away from the board once the hinge has been flipped as far as it could go The goal is to hurl a fuzzy critter at your victim, not metal shrapnel from your launching device, so it is best to secure the spring
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Project 8 Universal Critter Launcher
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Figure 3-23 The hinge is now spring loaded
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Figure 3-24 The spring is secured to the base
to the base As shown in Figure 3-24, the spring is held securely in place by winding it a few turns around the metal strip bolted to the underside of the board You may also find that the spring may need a bit of trimming if it is too long, or you will not be able to get the hinge into the locked position without bunching the spring up, which will reduce its effectiveness Now for the key element in this equation the launching mechanism, which includes the solenoid, battery pack and a hinge-release pin It is advisable to get this part of the launcher working
before attempting any circuitry, since nothing will work properly unless your solenoid has enough power to pull the pin away from the hinge once the device is loaded As mentioned earlier, you will not get away with a 24-volt solenoid and a 9-volt battery because there is simply not enough current in that battery to energize the electromagnet, so some type of battery pack will be needed A 12-volt solenoid with a 12-volt battery pack made of AA batteries is optimal, but you might get away with a 24-volt solenoid on the same battery pack as I did as shown in Figure 3-25 I used a bit of copper wire taken from some house wiring to create a pin that will keep the hinge in the locked position until the solenoid plunger pulls it away, releasing the hinge and the critter at high speed It has just enough pull in the solenoid as long as the copper wire is carefully set like one would set a mousetrap, but the unit did fire reliably once I got used to setting it up You could use a pull pin made of wire like I did, or let the solenoid pin rest directly over the hinge, depending on the type and shape of solenoid you have chosen One thing you should keep in mind is that the pin should be set to move as little as possible and be as close to the solenoid as it can get in order to deliver the most pulling power
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