![]() make sure that there is some room behind the switch when you attach it to the bookshelf. If you have already put the fan switch and bracket together then first, remove the fan switch so you can attach the bracket to the book shelf.Ģ. This will allow you open it up once the spring has been added (next step)ġ. ![]() NOTE: there should be a little bit of play in the drawer. ![]() To make the latch hole stronger, you can add the thin piece of metal to the ply wood as I have done If it is all working as it should be then use the template to make the same hole in the drawer and test to make sure it worksĥ. Do it a few time to make sure it wasn't a fluke the first time.Ĥ. Activate the solenoid and the latch will lift up allowing you to remove the test piece of ply. Once the lock is in the latch ole you shouldn't be able to remove the piece of ply wood. If it doesn't, keep making the hole larger until it engages. Place the test piece back into the drawer surround and test whether the solenoid engages into the hole. Drill out the marked area and then use a file to square off the hole.ģ. ![]() grab a small piece of ply wood and slip it into the drawer surround and engage the solenoid. Before you go and make a hole in the drawer, I suggest that you make a test piece and use that as a template. I also added a small piece of metal to make it stronger.ġ. There would have only been a very thin piece of ply for it to lock into. You can see why I needed to extend the lock out from the back. So now it's time to make the latch hole that the lock will go into. Slide the drawer into the surround and make sure that it is a nice fit and that it slides easily in and out. Make sure everything is square as well or you'll have issues with and ill fitting drawer.Ĥ. Once you have the ply wood cut to size (it should be the same length as the bottom piece that makes up the drawer surround), nail it into place onto the drawer. A little later on, you'll put a hole into this which will allow the latch on the solenoid to lock the drawer into place.ģ. As you can see in the images, there is a piece of the ply wood at the back of the drawer that sticks out. The way that the drawer locks into place is by latching into the ply wood base of the drawer. The drawer will need to slide in without hitting these parts so make sure the sides are cut to the right length.Ģ. NOTE: You'll need to take into consideration the area that the solenoid and switch take up in the surround. You'll need 2 sides and a piece for the back. Measure the inside of the drawer surround and cut the 3 pieces needed to make up the drawer. The sides of the drawer are the same size as the wood in the surround, you just need to make them a little shorter.ġ. Making the drawer is very similar to making the surround. Once the plywood was locked in place I activated the solenoid with a 9v battery and if I could remove the ply wood template then I knew it was at the right height. I made up a small template out of plywood with a hole in it and placed it under the lock. You want to glue the solenoid into place so that the lock is about 2mm from the bottom. Remember that you need to have the rounded section of the lock facing outwards so it will engage correctly.Ĥ. Add some superglue to the back of the solenoid and glue on the piece of ply wood. This will ensure that the 'lock hole' in the drawer the the solenoid engages into wouldn't be too thinģ. I wanted to bring the lock out further so I added a small piece of ply wood to the back. The lock on the solenoid sits very close to the back of the drawer surround. I used a grinder to do this and then cleaned up the edges with a file.Ģ. The solenoid has 2 mounting sections which will need to be cut off. It took me awhile to work out how to best add the solenoid to the surround and how that would engage to 'lock' the drawer into place.ġ. The next thing to do is to add the solenoid lock to the drawer surround. So without further ado - lets get cracking with the build! I kinda forgot that I would need to be able to access it when it goes flat!Īnyhow, I'm really happy with they way it works and really like how the spring loaded drawer 'pops' out when you push it. It also means that there are running changes that I had to made, the biggest was moving the battery to the outside of the drawer. You can't open the drawer without turning on the solenoid.ĭoing a build like this means a lot of on-the-fly problem solving. Once you turn on the solenoid, you push the drawer and it pops open. How it all works is, there is a small solenoid inside the drawer which is activated by either a small key lock switch or pulling the book down. I've had an idea running around in my head for awhile about building a secret drawer which opens with the pull of a book and decided to build it! You pulled the top of the book which would activate a switch and voila. A few builds ago I built a secret book switch which turned on a light.
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