Skip to main content

Questions tagged [wood]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1 vote
2 answers
110 views

Determining the suitability of a timber joint in a given situation

There seems to be a lot of information around calculating the forces exerted on a structure. When joining wood, once the structural analysis is done, how is the performance limit of a certain type of ...
Flash_Steel's user avatar
0 votes
2 answers
54 views

Are there structural (or code) reasons for choosing longer or shorter beam spans (besides bending moments, and ignoring cosmetics)?

When selecting the length of beams for a bridge, the better approach is to choose multiple full-length beams. Unless there is a compelling reason, one would not choose multiple shorter spans. An ...
Sam7919's user avatar
  • 441
1 vote
0 answers
65 views

What tools/process could I use to achieve this finish?

my son and I are doing a project together, but I’ve been struggling to find like a tool or process to achieve this ‘fillet’ I think it’s called, on the corners of this wood. Any ideas please? I have ...
Helpful man's user avatar
0 votes
0 answers
31 views

Which formula to use to calculate the main vibratory frequencies of a wooden joist floor? (8 Hz?)

When a wooden floor joist is a little undersized, there is a vibration phenomenon when walking on the floor. In some forums, I've often seen a frequency of 8 Hz mentioned when walking on the floor, ...
Basj's user avatar
  • 101
0 votes
2 answers
238 views

Making shipping containers with wood instead of steel, is my calculation sound and valid?

Please criticize my idea, thanks! For making shipping containers easily reusable as structural components for modular buildings, and reducing their carbon footprint, we want to made their structure ...
Ligon Liu's user avatar
0 votes
2 answers
159 views

"Box generator"-like software for laser cutting this shelf from MDF

I'm thinking of building this shelf out of cheap 1/4" thick MDF: Now knowing how slow I am in the most basic of woodworking, I want the job to be speedy & easy. So I decided laser cutting it ...
Tempus Nomen's user avatar
-1 votes
3 answers
4k views

Inline pull load rating of lag bolts in wood?

Is there some sort of general guidance or load rating for wood screws (lag bolts) going into framing wood where the force is pulling directly inline with the screw orientation? More context and ...
Wait But Why's user avatar
0 votes
0 answers
49 views

How much CO2 is produced by wood biomass under complete combustion?

If I have a one tonne (equivalent to 1.167 m3) of residual wood product used in a suspension burner at 3% moisture. The wood consists of a mixture of softwood by-products. How much CO2 would be ...
Georgia Peach's user avatar
0 votes
1 answer
909 views

Timber strength in tangential and radial directions

Normally for structural timber, two values for compressive and tension strength are given. One value is given for timber in direction of the grain, and other is given at 90 degrees (perpendicular) to ...
S. Rotos's user avatar
  • 2,259
1 vote
1 answer
93 views

Beam load - bending design value of southern GC yellow pine for treehouse beam span

I'm looking to build a treehouse and wanting to ensure the support beams can carry a sufficient load over an 11-ft span. Based on page 78 (aka 83) of https://awc.org/wp-content/uploads/2021/12/AWC-...
g491's user avatar
  • 113
1 vote
1 answer
115 views

Stability of solid rectangular wood member

I'm reading about buckling of timber members from Eurocode 5: Design of timber structures part 1. Formula 6.30 gives the relative slenderness of a member: $$\lambda_{rel.m} = \sqrt{\frac{f_{m,k}}{\...
S. Rotos's user avatar
  • 2,259
0 votes
1 answer
51 views

Resources for engineering with wood

I'm an engineering student and I've just taken my first solid mechanics course and I absolutely loved it! However, most of the problems in the textbook tend to deal with materials like steel, copper, ...
bens's user avatar
  • 3
0 votes
3 answers
211 views

Figuring out Geometry for Kreg 720

I'm making pocket holes to connect wood together with a jig, the Kreg 720. The 720 works by moving at an angle (which I'm trying to measure) to ensure the hole is drilled higher on thicker pieces. The ...
bonhoffer's user avatar
  • 155
0 votes
1 answer
77 views

Is it practical to build and use a linear or H shift pattern gearbox completely out of wood that will last just as long as metal one?

Ok, so after watching various wooden gearbox builds from youtubes, it got me invigorated with the idea of building my own gearbox that can be attached to an engine and use it on real life loads and ...
Newb Coder's user avatar
1 vote
2 answers
290 views

Solutions for a slanted roof

I'm using I-Joists to span this 27' vaulted living room and create a shed style roof. I've got two problems. Because of the angle, the joist won't make full contact with the walls (short of 20 years ...
Jared Cravens's user avatar
2 votes
2 answers
139 views

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 & ...
Alaaj99's user avatar
  • 21
1 vote
2 answers
108 views

Will my floor safely support 2000 lbs of live load over a 36"x36" area? [closed]

I'm trying to find out if my floor will safely support a live load for an aquarium in an area that is approximately 36" by 36". the total weight would be about two thousand pounds including ...
Mindy Dale Nasi's user avatar
0 votes
1 answer
39 views

How do I know how solid material has to be? [closed]

I want to build something like: I wonder, how do I know how solid/thick the wood has to be and how many braces there have to be? Is there a rule of thumb?
Ben's user avatar
  • 123
0 votes
2 answers
88 views

What's the minimum number of required wooden pieces to make this door structually solid?

This is the basic requirement of the wooden door frame: The requirement is to make sure that the door frame does not skew or deform. Questions: What's the minimum number of wooden pieces to be added ...
caveman's user avatar
  • 123
0 votes
0 answers
40 views

Lumber dimensions for machinery ramp

I would love help if anyone is able to offer any. I need to make a ramp to move equipment down a 3.5’ retaining wall. The ramp is to be 12’ long. I was going to use two 6” x 6” beams of Douglas fir, ...
Adams's user avatar
  • 1
2 votes
1 answer
1k views

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's user avatar
  • 115
0 votes
0 answers
49 views

Rule / equation for optimal screw diameter?

Is there a rule / equation for the optimal screw diameter per wood thickness? I have a 16mm baltic birch plywood, I have two pices 30mmX20mmX16mm I want to butt join them at their profile What will be ...
Simon's user avatar
  • 115
1 vote
1 answer
995 views

What is the name of a half wall with posts on top that divides a space into two?

I am looking for specific terminology around a half wall that acts as a divider to split a space into two separate uses. The top half of this features a series of wooden posts. It essentially ...
FrontEnd's user avatar
  • 113
0 votes
0 answers
129 views

Best glue option for laminated Kevlar <> birch plywood for not peeling off

I have a problem where I glue a laminated sheet of Kevlar to birch plywood and it peels off easily I tried: Laminating the Kevlar directly on the plywood with lamenting epoxy Using the laminating ...
Simon's user avatar
  • 115
-1 votes
2 answers
191 views

How to attach a metal rod to an air cylinder?

I have signed up for an engineering class, and the first project is purely mechanical. I've never done mechanical work, so this is quite interesting to me. I have come up with the following project - ...
NindzAI's user avatar
  • 99
2 votes
0 answers
42 views

Comparing EPA emission limits between wood stoves and wood furnaces

Emission limits set by the EPA were updated in 2020. Currently, "Wood-burning stoves" are allowed 2.5 grams/hour of smoke emission [1]. On the other hand, "Wood-burning forced-air ...
bitsmack's user avatar
  • 121
5 votes
5 answers
2k views

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's user avatar
  • 203
0 votes
3 answers
55 views

How is fire risk reduced in dense contemporary timber neighbourhoods?

In the Middle Ages most buildings were made from timber. After large fires timber was restricted or outlawed altogether and brick and stone became the preferred building materials, e.g. in London ...
sba222's user avatar
  • 151
2 votes
1 answer
124 views

Wood support calculation [closed]

Does anyone know how to calculate the width of the support (x) required for 6x10 lumber spanning 5’ supporting 2700 lb of uniform load and a load perpendicular to grain of 2000lb/ft2?
SSan's user avatar
  • 101
2 votes
1 answer
2k views

Wood beam connection

Can someone please explain why the top left image is correct and the bottom left image is not? Both of these images have the bolts on the lower half of the wood beam (tension) side.
SSan's user avatar
  • 101
-1 votes
1 answer
288 views

Wood Dimensional Stability

Between Glue Laminated and steel plate sandwiched between two wood beams, which one is more dimension-ally stable?
San's user avatar
  • 1
1 vote
1 answer
29 views

Glass/Tile drill bits

I meant to get a countersink for wood. Then in the hardware store, beside the countersinks, I saw a glass/tile drill bit set, which as a pack, is not so much more expensive than a single countersink. ...
Dehbop's user avatar
  • 149
1 vote
0 answers
32 views

What's the rationale for closely spaced standard LVL sizes?

Generally LVLs in the US seem to conform to heights that were historically used for solid lumber. e.g., 5 1/2" is the height of a nominal 2x6. This makes sense because presumably LVLs had easier ...
StayOnTarget's user avatar
2 votes
2 answers
324 views

Do the floorboards in timber beam floors have a structural function?

Timber beam floors with perpendicular timber floorboards as indicated in the drawing below are common throughout northern Europe. The floorboards are nailed onto the beams and are quite substantial ...
sba222's user avatar
  • 151
3 votes
2 answers
81 views

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 ...
Nicholas's user avatar
  • 133
1 vote
1 answer
93 views

Raised plywood false floor for heavy equipment usages

I have a electronics assembly company, and we run two assembly lines. They consist of several machines, with the heaviest being around 4000lbs, on 6 metal casters. We currently have the line on a ...
Kyle Hunter's user avatar
0 votes
1 answer
29 views

doubling the existent two brackets - will it help with my grape press?

Here is how the top of my grape press twists as I pull the car jack downwards (marked blue). I was wondering if adding another bracket (marked purple) on each side would solve the twist issue. Thanks! ...
kellogs's user avatar
  • 129
0 votes
2 answers
209 views

FEA software for Orthotropic materials

What FEA software is capable of simulating static studies on orthotropic materials such as wood? I must be able to define mechanical properties in X,Y and Z. I would also like to have access to ...
JC ME's user avatar
  • 170
1 vote
0 answers
334 views

Calculating diameter of steel rod required to not bend over a given length

I want to use steel (or other material) rods to support weight over a 900mm cavity. The weight that needs to be supported is technically unknown, but I'd specify some rough guidelines as: 100KG (max) ...
aaronrhodes's user avatar
2 votes
3 answers
373 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 ...
Jerry's user avatar
  • 21
3 votes
1 answer
513 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 ...
kdobrev's user avatar
  • 131
1 vote
0 answers
219 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. ...
David Ljung Madison Stellar's user avatar
1 vote
1 answer
152 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 ...
Alexus's user avatar
  • 181
1 vote
2 answers
124 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 ...
Jonathan Carver's user avatar
1 vote
2 answers
126 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'...
Zouhir Bensebban's user avatar
3 votes
1 answer
241 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" ...
user avatar
2 votes
1 answer
649 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 ...
Rithwik Sudharsan's user avatar
3 votes
1 answer
106 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 ...
ty.'s user avatar
  • 145
6 votes
2 answers
422 views

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 ...
user2817017's user avatar
1 vote
0 answers
82 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 ...
Jeffrey Atkin's user avatar