Questions tagged [strength]
Use for Questions where the strength of the materials and/or the overall design is of primary importance.
2
votes
1answer
82 views
Which way of joining is stronger?
I have to build a box to extend the length of a projector bracket:
The projector bracket weighs 7kg and has an arm of about 500mm. The projector weighs another 5kg.
The box has a depth of 140mm. ...
4
votes
1answer
99 views
Dovetailed spine?
I snagged the image below while looking online for dovetail examples.
Instead of two boards coming together, it appears that the joint, what I called the spine in the title, is a third piece to ...
2
votes
1answer
63 views
Flower Press with 1/8" thick plywood
I am making classic flower presses with children.
We'll be sandwiching from top to bottom: a plywood sheet, cardboard, paper, flowers, paper, cardboard, and a plywood sheet.
Each corner of the ...
1
vote
0answers
51 views
Which weight bearing knockdown joints
I'm building a Murphy bed with 18mm plywood.
I would like to use knock-down joints for the sides of the base (outer-frame). My research led me to cross dowels (see below)
When doing some tests ...
1
vote
1answer
102 views
If I make a stool from this composite (?) wood, will it end in tears?
I want to try making a stool based on this video series by Paul Sellers. Unlike Paul, I will use some power tools (power drill, oscillating tool for sanding/cutting, maybe rotary tool for sanding). ...
1
vote
1answer
110 views
Reinforcing chipboard
I'm not a woodworker of any kind but I am building a desk from a laminate kitchen worktop measuring 3000x600x38mm (L x W x T) but I only want the legs on the side. I don't want to have to put an ...
3
votes
2answers
153 views
Endgrain screw withdrawal force
The engineering toolbox has a screw withdrawal strength calculator but it assumes the screws are perpendicular to the grain.
I could not find a calculator for screws installed parallel to the grain, ...
-1
votes
3answers
89 views
Trying to determine support weight
I have 3 2X4 walls 16" high 30" long and 3/4 inch MDF plywood top. How can I figure its load support capabilities? What I'm doing is building a platform to put a washer and dryer on and need this to ...
1
vote
1answer
48 views
Sealing and reinforcing particle board
I am making some picture frames from an old table. The table top is oak slats on top of particle board. I’ve sliced the table and trimmed the slices with walnut, and cut rabbets in the frames. Like ...
2
votes
1answer
78 views
Is this frame design sturdy enough for a window seat?
Hope that this is the right forum for woodworking design critiques. I'm experienced with plywood but this is my first time attempting 'sturdy' furniture. I'd like to make sure it's going to be strong ...
0
votes
2answers
136 views
Is this shelving wall mounting idea stupid?
I am quite an amateur when it comes to woodworking, but I am very pragmatic and have done as much research as I can think to do so I don't mess anything up. But I can't really find anything to suggest ...
-1
votes
1answer
140 views
Monkey Bar / Play structure design question
I am trying to make a monkey bar for my daughter with Bamboo stakes I got from craiglist. I have a design like this in my mind.
There are two parts of this design,
4 Vertical support beams.
2 ...
1
vote
0answers
317 views
Dowel vs screwed butt for strongest butt joint in moving structural frame
Hi I am reading about all the different joint types and when to use them.
I am building a frame out of 2x2 lumber, joined at 90% most of the time, that will be under a lot of stress.
I figured out ...
4
votes
1answer
71 views
Laminating Boards For loft Leg
I'm designing the leg for a bed loft and was planning on laminating together 4 1x4's of Poplar. The middle two boards would not go the full length of the leg, so that a 2x6 can slide into it. This ...
1
vote
1answer
96 views
Copycat furniture legs
Looking for advice on achieving copycat look of the metal leg X-base; gold and marble table pic.
My skill set and budget doesn't allow for welding or purchasing custom base. Hoping to achieve the ...
1
vote
0answers
44 views
Would a threaded insert placed in or near the seam of a biscuit joint affect its strength?
Hopefully the question is clear. The threaded insert would be about a 1/2" long, and the lumber would be 8/4. The insert would be for a leg or a headboard bracket. If it would compromise strength, I ...
1
vote
2answers
956 views
Guess How much Weight the table can hold
i am new to wood working and just made my first wood table. I was trying to calculate how much weight will it hold on its top but i cannot reach any conclusion. So if any of you have any experience ...
1
vote
2answers
84 views
How to stop cat shelf split
I have two cat shelfs (brought, sorry). The problem that i have is that they are sometimes quite weak.
How do I make them more secure? What do I need to do?
This is the bottom of the shelf
...
6
votes
4answers
2k views
Strong method for bottom of a box
I want to make a box for a sewing machine. I can make dovetails or more likely simple box joints for the four vertical corners, but what's a good sturdy design for fitting a bottom so the weight of ...
3
votes
2answers
95 views
When do I need to support the center of a horizontal, load-bearing board?
I am going to make a low platform for my washer/dryer. Its sole purpose is to provide a level surface; my basement floor is scary uneven.
I'm envisioning something like this:
The leveling feet are ...
1
vote
1answer
383 views
What depth and offset from edge my dado / groove in particle board should be?
This is a follow-up on this question (How to make bottom for a big drawer)?
I have also read this one (What are the minimum, maximum, and optimal depths for dadoes, grooves, and rabbets) and I'm not ...
5
votes
1answer
306 views
How to make bottom for a big drawer?
I'm making a set of amateur under-bed "drawers" from scrap. Nothing fancy, just re-using materials from old closet. This is my first project of such scale.
There are intended to be 3 quite large ...
2
votes
2answers
139 views
Is standard box joinery sturdy enough for a hollow table leg?
I'm planning to make a desk with adjustable height. I want the legs to be two pieces: a lower, thicker leg from which a thinner upper leg can telescope. This means that the lower legs will essentially ...
4
votes
3answers
192 views
Question about the strength of Douglas fir
I need your help. I am a rock climber and I use a hangboard (photo) to train finger strength. It's a wooden board mounted on a 3/4" thick piece of plywood, which is screwed into some studs with some 3"...
2
votes
1answer
110 views
Carving a wooden handle - any rules of thumb?
I am carving a box with a pin-hinge lid out of a spalted japanese maple branch. The branch had an egg shaped cross section, so there is a ridge running down one side of the box. I am considering ...
1
vote
1answer
141 views
How might I design a “quick-breakdown” feature to allow easy assembly and disassembly of this floating beds frame supports?
I have built a couple floating beds now and assembly and disassembly is very time consuming. I've tried researching possible braces to allow the person who is assembling the frame the quickly connect/...
1
vote
1answer
90 views
For a kid's balance beam, which way should the grain face?
I made a wood balance beam for my daughter out of a fir 4x4 and some compression joints. Which direction should the grain be? Should the grain run parallel or perpendicular to the top of the beam?
5
votes
3answers
1k views
How can I strengthen my 3/4" Plywood Bunk Bed Plan?
I'm working on a plywood bunk bed for our two 4 year olds. Obviously I need it to look cool, but more importantly not collapse on their impressionable skulls.
I plan on using 3/4 plywood (.706 or so) ...
6
votes
3answers
683 views
Shelf made of 1x2 pine boards. Stable?
This is just a basic project for fun and experience.
The shelf will measure about 48,24,12 (H,W,D).
Do you think this would hold an even load of 50 lbs per shelf with 5 shelves?
1
vote
2answers
2k views
Lumber Dimensions for Brachiation Ladder (Monkey Bars)
My American Ninja Warrior watching daughter has asked me to build her a Brachiation Ladder (fancy name for overhead ladder or monkey bars). Here's an example:
The interesting part is that she doesn'...
3
votes
1answer
105 views
Can I make a stool from thinner OSB
I have some leftover piece of 12mm OSB.
I want to make this stool out of it:
Originally it was made from 18mm plywood, obviously I need to adjust to use thinner board.
I want to keep the weight to ...
6
votes
1answer
3k views
8 to 12 mm plywood box joints: brackets vs glue(box joint) vs screws
There's very similar question, but there're no answers for my specifics.
I'm going to build few open-top boxes to be used mostly as a bench to seat 2 grown-ups, with ability to also carry things in ...
5
votes
5answers
2k views
Supporting a level box on an uneven surface
I am building some 6' x 2' x 1.5' (depth) cedar planter boxes for specific locations on concrete outdoors. The boxes need to sit as close to the ground as possible, a few inches max.
I am building ...
4
votes
3answers
3k views
Where should the trademark be placed on a baseball bat?
As a kid during the days of Little League (my last close contact with baseball), we always admonished one another not to hit the ball on the trademark of the bat. You'll break it!
Well, ...
3
votes
2answers
907 views
Structural engineering with wood: determining post size, span, etc, for a timber frame house [closed]
This may be off-topic here, not sure.
My college background is math and physics, but I'm hoping to switch gears and build my own home and live off the land. So, I've been studying and reading up on ...
2
votes
2answers
559 views
Lightest woods that would be strong & stable for 2 components of DIY Wall Stall bar?
Lightest woods that would be strong & stable for components of DIY Wall Stall bar?
Maybe this list can help you help me in shortlisting.
Reference list of possible woods available but may ...
5
votes
1answer
135 views
Should I orient the cupped sides toward each other when laminating boards?
I'm making a replacement press plate for a small apple press using some edge glued oak boards from a hardware store. The board was flat as purchased, and after acclimating to my shop conditions ...
6
votes
1answer
392 views
Make a bunk bed v2
I decided to make a bunk bed for my room as it is small and I need a desk. I made a first design in this thread Make a bunk bed
But I realised that all the strength would be on the angle brackets ...
11
votes
3answers
526 views
Make a bunk bed
I decided to make a bunk bed for my room as it is small and I need a desk. I'm a beginner at woodworking and I need some help.
I have made some "plans", I will put 7x2m stakes, 4x1.40m each around ...
4
votes
4answers
776 views
How can I create a sturdy walking cane
I've read a little and I see that butcher blocks are really sturdy, but they only seem to be used for flat surfaces, can I somehow adapt the technique for walking cane. eg. make a dozen cylinder and ...
7
votes
5answers
3k views
Using softwoods for bench tops
As most of the regulars know I work with a lot of whitewoods. Pines mostly that come from pallets and what not.
I recently made a workbench from an old door but it was hollow inside so I plan on ...
3
votes
0answers
73 views
Maximum size for an unsupported bench [duplicate]
I intend to make a number of simple wooden benches in the near future.
However, my aim is to make a wider bench capable of seating four across - pew style. Can I reliably assume that the same plan ...
11
votes
3answers
15k views
Is there a reference for how much weight a dowel rod can support before breaking?
I realize I am still in the beginning phase of designing this but I want to make a guitar wall hanger. The design as is will be a simple base plate (either plywood or 1x dimensional lumber) with 2 ...
7
votes
4answers
5k views
How can I design a large cherry table with no aprons?
I am trying to build a cherry table. I will be creating the top out of multiple 8/4 boards using standard techniques. The table will be 42" wide by at least 68" long. I have come up with the idea ...
6
votes
3answers
3k views
Can you make a small wooden sail boat from cedar?
We have a lot of trees we've been removing from our property for one reason or another. Instead of throwing them on the burn pile, I thought I might be able to make something of them.
I've always ...
8
votes
1answer
420 views
How do I calculate the amount of downward force a nail will support?
I have a project in mind that creates a removable panel ceiling, made of wood, in my finished basement. Part of the current design is fastening boards to the 1950's ceiling/floor joists that the ...
