Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [wood]

65 questions
14
votes
1 answer

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 in tension on the surface and compression at the…
Voltron
  • 141
  • 6
13
votes
1 answer

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, consider a rim joist supporting the ground floor of…
Air
  • 3,211
  • 4
  • 26
  • 47
7
votes
4 answers

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. I am thinking of using some controller (as opposed…
Keychain1
  • 171
  • 3
6
votes
2 answers

Eccentricity for staggered 2x4 wall

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 to be loaded in the center of the axis of the…
user2817017
  • 386
  • 2
  • 9
5
votes
5 answers

What is the term for diagonal bars which are making rectangular frame more rigid?

For example in yellow: if all bars were rectangular, the entige frame would tend to skew. To prevent this, these diagonal bars are mounted. What is the term for them?
Dims
  • 213
  • 3
  • 8
5
votes
1 answer

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 stronger than steel? How are their comparative…
Alex S
  • 161
  • 1
  • 1
  • 4
4
votes
2 answers

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 (click for full resolution): At what angle will…
Kreeverp
  • 143
  • 1
  • 1
  • 5
3
votes
2 answers

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. The ball will hit the stumps if the hitter misses…
raj'sCubicle
  • 169
  • 4
3
votes
2 answers

Is it feasible to mount a 40kg shelf on a rotating and sliding pole?

I want to build a shelf that can I can place near a wall and still be able to rotate it around 180 degrees. I therefore would want to mount the shelf on a rotating pole and to reduce the needed distance to the wall would have a sliding mechanism…
Nicholas
  • 133
  • 3
3
votes
1 answer

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 twisted. I have drilled a hole in the upper most open…
kdobrev
  • 131
  • 2
3
votes
1 answer

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" and a simple bench. Knowing that bamboo is used…
user13851
3
votes
1 answer

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 stronger if the joint connecting the bottom to the…
ty.
  • 145
  • 5
2
votes
1 answer

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 in a steel bracket nailed to a column below what…
RLZaleski
  • 123
  • 1
  • 1
  • 4
2
votes
2 answers

What type of drill bits are these?

https://drive.google.com/file/d/1JPV6dRqB6f__N1eCcmn6QkOStLpVdc-U/view?usp=drivesdk Here's an image for bits Head. https://photos.app.goo.gl/HS8hFqLeWn8jecka7 In the image above (Google Images & Drive) a bunch of drill bits I found in my father's…
Alaaj99
  • 21
  • 2
2
votes
1 answer

How well does epoxy bond to PETG / ABS vs Wood?

I know that PLA does not bond at all, just peel right off But i'm wondering about PETG or ABS Will they bond just as well as wood?
Simon
  • 115
  • 1
  • 10
1
2 3 4 5