barcode generator c# wpf Project 35 Coin-minting Machine in Software

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Project 35 Coin-minting Machine
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Figure 8-8 A few metal slugs, a coin and a CD-ROM drive
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Figure 8-9 Parts for your junk bin
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Let s start by removing everything out of that old CD-ROM drive until nothing remains except for the loading tray and the motor that makes it open and close Start by removing every screw you can see to split the metal cabinet open, and then continue taking out all of the screws until the parts are strewn all over your workbench You will not need the main board, laser head, spindle motor, or any of the parts that are not directly involved in opening and closing the drive tray Most DVD and CD drives will contain three small DC motors: one for the tray-loading mechanism (the one we are keeping intact), one for turning the spindle, and one to move the laser head
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up and down the track while reading the data Since our machine needs to make some fake coin-printing sounds, the laser head motor will be perfect for this because it is a standard DC motor with only two connecting wires Figure 8-9 shows all of the leftover parts after reducing the drive down to nothing except for the tray-loading mechanics The loading mechanism will consist of a plastic tray riding along a pair of sliders, one of which is cut into a gear rack so that the loading motor can drive a small pinion gear along the gear teeth to open or close the tray The motor will be the size of a pop bottle lid and will be connected to a belt-drive
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Figure 8-10 Testing the loading mechanism
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Project 35 Coin-minting Machine
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Figure 8-11 Drive tray insert with slug hole in center
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reduction system to slow down the speed of the gear that runs along the gear rack If you cut the connector off of the end of the motor wire pair and hook it directly to a 9-volt battery, the tray will either open or close depending on the polarity of the battery Normally, this motor runs on 5 volts, so the tray will open and close very quickly when connected to a 9-volt battery, but this is OK, and will not harm the motor Figure 8-10 shows the strippeddown loading mechanism being tested by connecting a 9-volt battery directly to the motor wires The loading tray will now be modified to carry the metal slug into the unit, so a bit of thin wood,
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cardboard or plastic must be cut so that it can be bolted to the tray where the CD or DVD used to sit The thickness of this insert should be no more than the thickness of two quarters, or it may get stuck between the drive cabinet when the door is closed I found that the thin wood backing found behind dressers and cheap stereo speakers was the perfect size for this job as it was about the same thickness as heavy box cardboard A hole slightly larger than the metal slug should be drilled through the center of the inset as shown in Figure 8-11 (the slug is inserted into hole) A piece of thin cardboard or sheet metal will need to be placed
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under one side of the hole as well so that the quarter and slug do not fall right through the insert hole I used a bit of cardboard The insert needs to be about the same thickness as two quarters because it will carry an actual quarter with the slug placed over the quarter when it is being loaded The quarter is hidden from view by the slug until the drive tray is fully closed at which time a small magnet will remove only the slug so that the quarter will be the only thing left in the insert hole when the tray is opened The operator will press the coin-minting button after the tray is loaded and closed to make a mechanical noise to add to the effect, but the actual switcheroo will happen instantly inside the machine without any noise at all The drive tray insert will be bolted directly to the drive tray using some small nuts and bolts, or machine screws as shown in Figure 8-12, but ensure that the bolts do not hit the surrounding mechanical parts as the tray is opened or closed This should be tested with the drive casing installed over the loading mechanism to ensure that there are no clearance issues Once you have installed your coin and slug tray insert and checked it for proper operation using the
9-volt battery, you can now create the magic switcheroo device, which is nothing more than a small magnet placed over the insert hole inside the CD-ROM cabinet Most CD drives will have a small round metal lid in the top cover placed exactly over the center of the motor spindle, so this is where we will mount our lifting magnet This small metal lid is perfect for our device because it will allow easy removal of the hidden slug after we baffle our friends with our new high-tech counterfeiting operation Most likely, the metal lid will be under the manufacturer s sticker and need a bit of prying to remove the glue seal that holds it in place If for some reason your drive casing does not have a removable lid, as shown in Figure 8-13, then you will have to drill or cut one yourself The opening needs to be as large as the slug so you can remove it once the magnet has done its job The small ceramic magnet shown in Figure 8-13 was taken from a fridge ornament and is thin enough to avoid getting in the way of the drive tray once the lid is placed back over the drive cover opening This magnet does not need to be very strong in order to do its job, and it is better that it is not, since you only want to lift the slug away
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