Introduction: Coffee Table W/ Raising Top/compartment
I decided I needed a new coffee table so I set out to build something that maximized storage, that could be used to as a work surface for my laptop, and looked halfway decent. So I came up with this design.
-Storage for oversize books
-A large cedar lined drawer for wool blankets, etc.
-A segmented top that will raise up and over to allow me space to work on a laptop and provide a nothing if not strange compartment for storage of small things.
-and Casters in case i want to move it (these can easily be replaced with short 3" legs)
Step 1: Tools and Materials
For this build I used a lot of usual carpentry tools and some can be substituted if you dont have a huge shop.
Tablesaw (Circ-saw could work)
lots and lots of clamps
3/4" Paint grade Plywood
1/4" Plywood (for the drawer bottom)
1/2" Plywood (for the drawer sides)
A big chunk of hardwood or veneered plywood (for the top)
Glues (primarily wood glue, but also spray contact cement for the felt)
Drawer runners (either purchased or homemade)
Screws (a range depending on the need about 1" to 2")
Tension Springs, 6" (small gas springs would be really nice)
Step 2: Design
First Step was to figure out was how big I should make it. I settled on 18" tall, 24" wide, and 48" long.
I did the initial design on paper with pencil, cause it's easier. But then I moved to a 3D program and worked things out more concretely.
There are three segments to this table. The drawer, The Bookshelf, and the Lift Top.
After working out these dimensions I moved to the cut list.
Step 3: Cut-List
First Thing is first.
The majority of this will be built from 3/4" Birch Plywood. Which comes in sheets of 48" x 96".
I essentially made three carcasses, then screwed to the bottom and then to each other.
Lay out your Rip's first then your Cross Cuts. There are some programs that will do this for you, but where is the fun in that?
As you can see the pieces for this build make for an odd set of cuts. I had to rip then cross cut then rip some more.
Step 4: Build the Carcass
The three carcasses can be seen in the photos above. One deep wide one for the drawer, One Shallow one for the storage, and one just big enough for my largest books.
I glued and pinned them together with the nail gun before screwing everything together.
The boxes at this point do not have a top, just a couple of 3" strips of plywood, something to secure the top to.
I finished the edge-grain of the plywood with 3/4"x3/4" strips of solid wood glued and clamped to the ends. After the glue was dried I sanded the strips smooth and flush for painting.
Step 5: The Raised Top (AKA the Hard Part)
This was tough. I took a lot of time to figure out the geometry of this moving part.
I knew the raised piece would need four supports.
But I needed to figure out:
-How high it was to raise.
-How far over it was to move.
-Then combine that with how long each support could be and still fit into the storage area.
-I also had to work out the spacing of the bolts for the supports.
I wish I could get into more detail of how I did this but time and a bad memory prevent me from getting there. Besides I think your own project may have different requirements and dimensions.
There was a lot of drawing and eventually a full-scale mock up before committing to anything. (there is no substitute for a full-scale mock up)
After the supports were laid out and bolted in, I need to make a structure to connect all the supports and to screw the table top to from underneath. (that was very simple)
To help with lifting and closing I added a tension spring to each support. I simply looped the ends of the springs around the bolts. I used 6" springs, just shorter than the distance of the two bolts. This is a little too much, the top can "launch" into the upright position too fast. HOWEVER, the springs do help keep the top down as well.
Step 6: The Table Top
The table top was a strange experiment in lamination. I wanted hard wood but I have a limited budget. I had a large Cherry board but it was a mess. Full of holes and somewhat warped. So I ripped it down to 1/4" strips and laminated those strips to a piece of 3/4" birch plywood. Then when that was dry I cut it to the size I wanted (48"x24"). After that I hid the edge-grain of the plywood with 1" strips of cherry, mitered and glued.
This worked surprisingly well. The top has a really nice color to it and I like the edgegrain of the cherry much better than the face grain.
The only thing I think I would have done differently is waited a while before lamination for the wood to stabilize. It is winter now and the cherry has shrunk leaving only slightly visible gaps between them. It's enough to drive me mad, but most wont notice.
Step 7: The Table Top Part II, the Big Cuts
The table top once finished needed to be cut into three pieces. and those cuts needed to be cut at a bevel so that when the middle raises up and sets down it doesn't bind up.
I chose an angle that matched the angle of the supports had when raised. ( I can't recall what that is now)
anyhow. This is a scary part of the build because I could easily cut at the wrong measurement (I've been known to do that.) or the wood could chip out and leave a ragged edge.
I First laid the top on the carcass and decided where to cut. Then Before Cutting, I laid down some blue tape where the cuts were to be made (this will help prevent chip-out)
then I used a tee square to transfer those lines across the width of the top with a pencil.
Then, I used another straight edge to cut those lines with a utility knife (this will also help prevent chip-out)
THEN I got out my cross cut sled, set the bevel on the table saw and began my cuts with a deep breath.
Step 8: Finshing Up.
I finished by laying out the cut pieces of the top onto the carcass and lining it all up perfectly.
Then I carefully marked and screwed all the pieces into place with pan head screws.
I screwed four locking swivel casters to the bottom (these could easily be some wooden feet)
and finished any sanding and painted the plywood and oiled the table top.
I had some felt and glued that into the compartment. I built the drawer from 1/2" plywood and faced it with a chunk of painted 3/4" plywood. Then the drawer was lined with some thin strips of aromatic cedar I had lying around.
It was a fun project. I'm happy with it but I miss feeling like I can put my feet up on the coffee table like I used to.