17 votes
Accepted

Would this TV stand made almost entirely of 3/4 in birch plywood withstand the load?

If you build this right I think you could safely park a motorcycle on top of it. And no, I'm not exaggerating. A (very large apparently!) TV and soundbar should not pose any risk whatsoever. As ...
Graphus's user avatar
  • 65.8k
8 votes

Would this TV stand made almost entirely of 3/4 in birch plywood withstand the load?

3/4" plywood is VERY strong. I have some on a shelf in my shed holding my turning wood, I used full 4'x8' sheets and I have several hundred pounds on it. no dipping. I also have some 1/2" ...
bowlturner's user avatar
  • 16k
6 votes
Accepted

Can I enlarge this wood rack without beefing it up?

Firewood stacks pretty well, so there shouldn't really be any load acting sideways on the upright supports, even with a much wider (longer?) rack. Additionally, you're only making it taller by about 5 ...
mmathis's user avatar
  • 2,622
5 votes
Accepted

How to determine drawer weight capacity?

Is the Sagulator a reasonable way to figure out drawer weight capacity? No. Does a glued dado count as 'fixed ends'?. If you glue in yes, but the dados front and back change things completely. You ...
Graphus's user avatar
  • 65.8k
4 votes
Accepted

Weight bearing for a loftbed and wood only joints

I see three inherent weaknesses, two of which critically compromise the strength of the bed. I'd suggest looking at commercially-produced solid wood bed frames for some design ideas (don't look at ...
rob's user avatar
  • 18.7k
4 votes

Weight capacity - TV Stand

Without on-site testing, it might be a challenge to make a guess. How do you feel about the floor being able to manage the weight? Measure the width and length to get square meters or square feet and ...
fred_dot_u's user avatar
  • 2,899
3 votes
Accepted

How to use Sagulator for Sofa / Bed?

The weak point is the front, in the middle of the sofa (and correspondingly, the middle of the bed on the seam). You could fix the sofa with lumber on edge underneath the ply, but that doesn’t fix the ...
Aloysius Defenestrate's user avatar
3 votes

Pull-Up Bar - Wooden dowel - 1.25" actual diameter

I don't know how to calculate it, but it passes the sniff test when compared to parallel bars used in gymnastics: These are made of (unspecified) wood, are 11.5ft long and 2 inches thick. They are of ...
WhatEvil's user avatar
  • 3,948
3 votes

How do I calculate the weight capacity of my one side supported bookshelf (Spine Booshelf?)

Your design raises some interesting issues and requires additional consideration for connections. Each shelf is supported at only one location and the actual load on each shelf is not the only ...
Ashlar's user avatar
  • 8,454
3 votes

Weight bearing for a loftbed and wood only joints

Rob's concerns are important. When you calculate the load that the main beams will carry you must ignore the depth of the notches and calculate the sag/load based only on the depth of the continuous ...
Ashlar's user avatar
  • 8,454
3 votes
Accepted

Canopy bed frame design supporting a suspended adult?

What you have described is a swingset with a mattress connected below.To design this hybrid fabrication you must first consider each function separately. For the swing, consider the designs for ...
Ashlar's user avatar
  • 8,454
3 votes
Accepted

How to increase maximum load capacity of a table?

First of all, the 110 pounds they say for that desk almost certainly is being very conservative, it will probably actually hold at least twice that. That being said, we can look at the ways it can ...
LeeG's user avatar
  • 8,046
3 votes

Load Bearing Weight Capacity of a 3/4" x 3/4" Wood Molding?

While your concept can certainly work, there are several considerations that will help it perform well. Wood species. A softwood is not nearly as strong and will be more prone to splitting ...
Ashlar's user avatar
  • 8,454
3 votes
Accepted

How much weight can this stand hold?

I would not recommend using this table for a fish tank. There are too many potential sources for failure. If the tank rests upon the 3/4" top instead of extending to the width and length of the ...
Ashlar's user avatar
  • 8,454
3 votes
Accepted

For a kid's balance beam, which way should the grain face?

You want the grain/growth lines to be oriented vertically to maximize strength. Most 4x4 posts will have curved annual growth lines. Choose the orientation that is most vertical. As a caution, note ...
Ashlar's user avatar
  • 8,454
3 votes

Making a modern chaise on two cylinder legs stability issues

There's a few things going on that will make this feel less stable. First, and I'm not 100% sure about this, so possibly ignore, but it looks like in copying the design, you've stretched the main deck ...
Aloysius Defenestrate's user avatar
3 votes

Making a modern chaise on two cylinder legs stability issues

The design and construction is inherently unstable. You would do better to remove the 1x material and build the platform with two or three layers of plywood laminated together using glue and screws. ...
gnicko's user avatar
  • 1,496
2 votes
Accepted

Convert a minimalist bench design into a desk

Are any structural concerns with making the table this long? No. Even with a top much thinner than you're going to end up with you can have a >100" span. Would the table need to be reinforced ...
Graphus's user avatar
  • 65.8k
2 votes

How can I determine the load capacity of a simple bench?

You can always take the Calvin & Hobbes approach!
CoAstroGeek's user avatar
2 votes
Accepted

What Screw Should I Use For Fasten a 3/8th Steel Flat To A 4x4?

I would like them to lay flush against the steel flats This will be the role of countersinks you make in the steel rather than determining what screw to use. Note however that if you decided to use ...
Graphus's user avatar
  • 65.8k
2 votes
Accepted

How do I calculate the weight capacity of my one side supported bookshelf (Spine Booshelf?)

How do I go about figuring out how much weight each shelf can support? Based on what follows this becomes sort of irrelevant, but if you did want actual numbers the only way I can think of ...
Graphus's user avatar
  • 65.8k
2 votes
Accepted

Weight limit of IKEA Lagkapten/Alex desk

I think this should be fine, but as mentioned in the Comments you'll want to assess for yourself. While the knockdown fasteners that Ikea use here are not noted for being a super-strong way to put ...
Graphus's user avatar
  • 65.8k
2 votes

Screw Placement for Wall Hung Top Cabinet

In very general terms, for the best support, you'll want the fasteners to attach to the studs in the wall. If you have to shift the location of them to achieve this, as is suggested by your second ...
gnicko's user avatar
  • 1,496
2 votes
Accepted

Screw Placement for Wall Hung Top Cabinet

The difference between the two placements is torque. In diagram 1 all forces act downwards (at least the ones that matter, there might be other components to it, but these are negligible). All weight ...
Max's user avatar
  • 281
2 votes

Input sought on sturdy design for a storage + seating bench/seat

There are 3 things I would consider for this type of structure. Will the seat hold the weight without bending too much? You can use this calculator to select appropriate material and thickness: https:/...
stanch's user avatar
  • 307
1 vote
Accepted

Is it possible to convert Ikea crib to an adult sofa/couch?

I suspect the answer to the question in the title is yes, but not a good one. The crib is obviously made for a very lightweight occupant and the limited amount of strain they can introduce :-) and as ...
Graphus's user avatar
  • 65.8k

Only top scored, non community-wiki answers of a minimum length are eligible