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Questions tagged [wood]

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Can I replace a 7' vertical 4x4 lumber post with 2x2 square tube steel with 1/4" walls?

I have a wood post holding up a roof overhang and I'd like to replace it with steel to match an aesthetic. I've tried to do my research and I've found that my 4x4 Douglas Fir post should be rated at ...
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2answers
48 views

Max torque allowed on cypress wooden beam

I am trying to calculate the maximum torque that a piece of cypress wooden beam can handle before it snaps or becomes structurally unsound. I know this will depend on the thickness and width of the ...
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1answer
55 views

How to calculate the bending resistance of a square metal bar?

I have an old bend/twisted wooden door. It has some character to it so I want to keep it and add square metal bars to straighten it. I have provided a sample drawing of the door and where it is ...
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0answers
29 views

How to span a 28' gap, preferably with wood

I am building a temporary structure in a windy area (this is for Burning Man). We are essentially using 4x4s that are embedded into the ground (hard clay floor) that are spaced apart by 2x6 rafters. ...
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1answer
49 views

Common points to consider when building a window seat

I am trying to construct a window seat like this one: I live in Canada. I was wondering what are the common construction code points to consider on this one? Materials - does it matter if this is ...
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2answers
105 views

Design of multiple wood layers

I am currently working on designing a teeterboard for the circus (a seesaw that people jump up and down on the ends), and need some advice on my methodology for wood selection. The primary wood will ...
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2answers
84 views

Which frame is optimal for children's bicycle trailers? tubular or rectangular frame and why? [closed]

I need to construct a 3D wooden bicycle trailer for Kids. The weight of bicycle trailers must also be light! The Frame should be made of wood. what criteria should I use to construct a Frame,Children'...
3
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1answer
102 views

How to structurally bind bamboo stems for loads?

I would like to begin a case study in structural design using bamboo, which has currently become available to me. The design instance I would like to structurally copy is the Rogue RM-6 "Monster Rack" ...
2
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1answer
196 views

What's the difference between critical load and yield stress, and failure in general?

So far, I have learned of three quantities that are related to the failure of a beam (axial and longitudinal loads). The first illustrates the stress under which balsa wood will undergo plastic ...
4
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1answer
79 views

Which drawer design can hold more weight?

I want to build drawers for my kitchen. On Youtube I found this Channel, where a guy does woodworking. In a video about making kitchen drawers, he says that the bottom surface of the drawer will be ...
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0answers
283 views

What types of 'sliding hinges' used in this murphy bed?

As you can see above Murphy bed has special hinges that enable swing between one face to another, I want to know what type of hinges are they? Could you also give link to a website that sell those ...
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0answers
22 views

Which elasto-mechanical properties of wood do I have to check for a triangle?

I'm building wall support angles from (recycled) wood (cut with a circular saw) which consist of a wall support and a top support and two triangular sides. The wall support is fixed against the wall ...
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31 views

Attachable/Removable Table Leg

So I am having a welder make a 24'x48' frame, on the bottom of the frame I would like to have 3'x3' metal plate about .25cm to 1cm thick on each corner to act as areas for legs. If i had him leave it ...
4
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1answer
135 views

Eccentricity for staggered 2x4 wal

I have a staggered 2x4 wall on a 2x6 sill plate as illustrated below (16" on center on each side = 8" on center each stud). The wall is loaded from both sides by floor joists, so I would consider it ...
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0answers
35 views

how does thickness affect the maximum crushing strength and modulus of rupture of wood?

I have modulus of rupture (MOR) and maximum crushing strength of various species of wood. I am trying to understand how the thickness of wood a wood beam laid flat on the ground would affect both ...
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1answer
7k views

Steel vs Bamboo strength types/ weight and in various directions & orientations? Specific, Tensile, Compressive, Shear, Lateral etc?

Why bamboo is the ‘green steel’ of 21st-century Asian architecture Bamboo fibre is stronger and cheaper than steel, says Dirk Hebel Carbon Fiber Vs Steel Vs Aluminum Vs Bamboo Pros and Cons Is bamboo ...
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1answer
69 views

Positions of Max Load a human would exert on horizontal rods of such a system by positioning leverage & bodyweight?

My mechanical & civil engineering usage is gone as the last time I did that was in Freshman year & my major went in another direction, but I've tried to be as thorough as possible using a ...
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1answer
3k views

For a column, what does “rotation fixed and translation fixed” mean

So there's a permutation of rotation and translation each being either fixed or free for a column. What do each mean? If the column is toe nailed to a plywood / beam underneath which is it? If it's ...
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2answers
477 views

Best plastic composite alternative to wood

I am planning to replace the material that is used for Cricket Stumps. Cricket is a game similar to baseball. One difference is the presence of 3 successive stumps between the hitter and catcher. ...
4
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1answer
10k views

What angle - for a strut - provides the greatest vertical strength/support for a cantilever?

I want to affix a cantilever to wall. I will support the other end of the cantilever with a strut made of wood, that attaches to some point on the wall below the cantilever, as shown in this sketch (...
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4answers
2k views

What are the common failure points of waterproof cases?

I am making a waterproof case for my Galaxy S5 and/or my Raspberry Pi. I plan to make the main body from (or at least decorate it with) wood, though I can use other, stronger materials where needed. ...
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1answer
791 views

Why does prestressing in trees make them stronger?

In "Structures: or Why Things Don't Fall Down" James Gordon talks about trees being prestressed with the outside in tension and the inside in compression. Why does it make a tree stronger to have it ...
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1answer
10k views

How does pressure treatment affect the mechanical properties of lumber?

Pressure treated lumber is specified for many exterior applications because of its resistance to insect damage and fungal rot. But how does it compare to untreated wood, mechanically? For example, ...