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as the title says a simple bedframe that i came up with to raise my memory foam mattress topper off the floor slightly. 
when designing this i had a couple ideas in mind: 
i wanted no hardware so it was easy to assemble and disassemble 
and i wanted to make it out of simple materials like 2x4 and just a single sheet of 4x8 plywood

i used:
Illustrator for all the layouts for my cuts.
5 2x4s
1 4x8 sheet of 3/4" plywood
1 3/4" dowel
compound miter saw
table router
table saw
panel saw
hand drill with 3/4" hole saw
drill press with 3/4" forstner bit
orbital and belt sander

all my wood working was done at TechShop San Jose

Step 1: Layout

using Adobe Illustrator
I started with a rectangle the size of my mattress and a 4x8 rectangle 
first i wanted to figure out how to cut my plywood into as few pieces as 
possible to cover the area of my mattress.
Then I chose the placement of my 2x4s and the dowel holes to keep 
the plywood from sliding around.

Step 2: 2x4s

First I cut my 2x4s using the compound miter saw.
Next I marked the placement of the dowel holes and the 
notches for the cross halved joints.
Using the Drill press and a forstner bit I drilled out the dowel holes.
Then using a combination of the table router and table saw with 
dado blades cut out the joint notches.

Step 3: 4x8 Plywood Sheet

Using the panel saw I cut out my three main pieces from the full 
4x8 plywood sheet. Then I marked the locations of the dowel holes and 
drilled them out with a hand drill and a hole saw bit. Using the belt sander
I rounded the corners a bit. Then with the orbital sander I gave all three 
sheets a good smoothing out.

Step 4: Cut Dowels

I got a 3 foot dowel and used the compound miter saw
to cut it down to the sizes that I needed

Step 5: Assemble

layout the 2x4s with their interlocking cross halved joints
making sure to have all the holes facing up. 
then place the sheets over the 2x4s and place the dowels 
in the holes. 
and done... simple bed frame to elevate my mattress topper
<p>practical use of technology, science and IDEA</p>
Very practical. Thanks.
I really like how you've maximized the use of your materials here. Bravo.

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