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Anonymous
Bookshelf Construction 2017-07-16 01:39:04 Post No. 1209980
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Bookshelf Construction 2017-07-16 01:39:04 Post No. 1209980
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So, I am currently planning a bookshelf for my living room. The shelfs have to be 120cm wide and about 35cm deep. The shelf is should be able to support a lineup up heavy encyclopedia style books stacked along its entire length without bending to a degree, where it is visually apparent. According to my calculations, 30mm thick plywood with 3mm walnut veneers on each side, will still bend more than 2cm in the long run. Which I assume is going to be visible under normal circumstances.
How should i go about doing this, without using solid hardwood, since I dont want to do that due to warping and expansion concerns. Especially, since the room, which the bookshelf is going to be in has a relative humidity of 70%@19° in the summer and like 45%@19° in the winter.
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Why are you storing books in a room with 70% humidity?
Also, use real units.
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>>1209981
Because thats the retarded climate combined with the fact, that this is a 200year old building with almost 50cm thick stone walls. Those walls never really heat up and so it cools the humid 35° outside air down to like 18°C, which is equivalent to the temperature that most modern basements sit at during the summer.
The metric system is the system of god dude.
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>>1209982
Yeah, I don't really care about that. How is it that you can spend enough time working on a bookcase to calculate the deflection of plywood under load but you won't buy a fucking dehumidifier?
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>>1209984
How is a dehumidifier going to fix the problems related to the flexing of the shelf?
Maybe I could make some Walnut 3 layer Plywood, with a core consisting of small strips and 2 1.5mm veneers on each side to get the grain direction right.
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>>1209990
>How is a dehumidifier going to fix the problems related to the flexing of the shelf?
A humid room is going to turn both your plywood shelves and the books sitting on them to shit.
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>>1209992
Wut? 70% is normal where i live. There are no mold issues with any of the furniture in my house.
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I don't believe for a second 30mm plywood will bend that much over only 1200mm.
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Check your bend assumptions with the Sagulator -
http://www.woodbin.com/calcs/sagulator/
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