I've posted about the four drawer filing cabinet I wanted to make for my office. Well, I finally made it a reality this last winter.
I had a plan. No really... I had a plan.
My plan was to use some free rough sawn air dried soft maple that I acquired a few years ago from a coworker who was moving out of town and was leaving his woodworking behind. He'd tried selling it and had no takers so he gave it to me.
The second part of my plan was to spend the last week of December 2024 and see if I couldn't finish a large project in a single week. (hint: I couldn't)
I started by rough milling the soft maple. What I ended up with was a pile of disappointing looking wood. The first couple of pieces I'd pulled out last summer was a pretty brown and slightly spalted (blues and pinks) color. A large portion of what I had turned out to be kind of ugly and whatever spalting that was there just looked like black mold..
I thought long and hard about it. Then for giggles I checked how much it would cost to buy lumber. Turned out I could build the entire filing cabinet for just over $200 in cherry. I've always loved cherry but in the beginning of my woodworking hobby cherry was the expensive wood and walnut was less expensive. Now it's the opposite.
I did finish milling the soft maple so it will be readily usable for another project but then I ran out to the lumberyard and picked out several nice cherry boards and brought them home.
Construction of the filing cabinet was relatively typical. The one thing I did different from other cabinet projects is that I built the drawers first. Typically the size of drawers isn't the critical dimension. If your sock drawer is 1/8" wider or deeper you aren't going to notice. However, since my drawers needed to hold a specific dimension of hanging file they were made a bit earlier in the process.
But, I am getting a little ahead of myself. My first step was to rip some book-matched boards out of some 5/4 cherry for the panels in the sides of the cabinet. These were critical path because I needed to get them finished before I could start assembling the sides.
I did use 5/4 for two 1/4" thick panels. I'll admit I did it because I'm not good at resawing on the bandsaw and I didn't want to risk too thin panels from a 4/4 board. Of course then I decided to leave them extra wide (i.e. wider than 6") and they were beyond the capacity of my 14" bandsaw. So I ended up using a rip blade on my table saw and then used a ryoba pull saw to finish.
In the interest of time I cheated a little. I didn't bother sanding the faces of the panels that would end up being on the inside. This "sacrifice" saved me a couple of hours of sanding plus when I was applying the finish - to both sides - I didn't need to be precious about the inside faces. This made applying finish easier too. I also left witness marks on the inside faces so I could keep the parts organized.
While the oversized panels were in my finishing room I built the drawers. Their dimensions were set by the size of a US legal sized hanging folder. This defined the width between the rails (sides) and height. The drawer depth was defined by how deep my filing cabinet was going to be. From this I created a cutting diagram and cut out the drawers pieces.
There are a lot of ways to build drawers; however, since I was planning on filling these with 50lbs or more of paper per drawer I wanted them to be as strong as I could make them while still being cost effective. My favorite way of building drawers is out of 1/2" plywood including the bottoms. It is relatively dimensionally stable and plenty strong.
I know a lot of people might just use a butt joint and some brad nails; however, I prefer tongue and dado joinery. It doesn't take a lot of time to set up a 1/4" dado blade, cut all the dados and grooves, then come back and make the mating tongues. It gives me increased gluing surface as well as joints that will help align the pieces and keep everything square.
One choice I did regret was using Sande plywood from my local big box store. It was less expensive than birch plywood from my hardwood supplier but it was also not the best plywood. It had voids and was soft enough that when I made some jigs out of the offcuts screws would rip right through it. Though, I think it will be fine for this purpose.
I did finish building the drawers with what I had because I didn't have anything else. I figure if they ever start falling apart I can rebuild them then. It's an experiment. Living, learning, and growing.
Here's a mockup of how I did the rails. They're basically 1/2"x1/2" angle aluminum that I screwed into the tops of the drawer sides. So far they are working great and I have no complaints.
With the drawer boxes complete I started working on milling the lumber for the drawer faces as they were going to need to be glued up out of multiple pieces and the rails and stiles for the sides.
Unfortunately, this was where my week of PTO ran out. It was January 2nd. My finishing room needed to be reverted to an office and I had not really started on the case work yet. Things were already not going at a breakneck pace but I needed to go back to my day job. However, by the end of January I had managed to get the side panels assembled.
Yes, I saw the staining at one end of those panels. I'd already cut my board to rough length and couldn't use the other end. As discussed earlier, this is not the first of the compromises I made for this piece of furniture.
Once the glue dried on the side panels my next step was to start cutting the joinery. I'd had a lot of different ideas for how to fasten the rails between the sides. I'd even considered using sliding dovetails to get additional mechanical strength. In the end I decided to just use shallow 1/4" mortises in the sides and stub tenons on the rails.
To get some level of accuracy I first calculated, then re-calculated, then sanity checked the spacing. I then did layout on the mortises. I also built a jig so I could cut them using my plunge router with a collar.
This whole project was about stretching my comfort zone. I wanted to try to build it quickly and I also wanted to try some new techniques.
All of the cabinets I have built so far have a top that sits on top of the carcasses. This allows me to put screws in the front and screws in slots in the back to account for wood movement. The design for my filing cabinet has the top inset inside and between the two side panels. I could have just added more structure inside the case to fasten the top to; however, I decided instead to use a sliding dovetail joint. I am relying on the dovetail to hold the sides together.
For my first sliding dovetail I am satisfied. They aren't great but they're good enough for a prototype filing cabinet. I need more practice with this joint.
With all the joinery complete I could move onto glue-up. I've been dry-fitting throughout the entire project but I did do another complete one along with miming adding glue to each joint. This let me know there were going to be a couple of challenges with the glue up.
The first was that trying to do it all in one big frenzy of gluing and clamping probably wasn't going to be a good idea. If I glued in all the rails to just one side I could take my time, at least on the first side.
The second problem was that my sliding dovetail on the top meant that I couldn't just bring the two sides together. I needed to be able to slide the top into place. The challenge with that step is that I had already fit the front lip onto the top and the top back rail would interfere with sliding the top on.
I worked around this issue by shortening the stub tenons on that one rail and with the top only partially slid into place there was enough movement to get that last rail in.
So, I glued the rails into one side using the top and the other side to make sure they were all square. After 24 hours of clamping I took the cabinet apart. Put the unglued side face down on my workbench, added glue to the mortises and tenons then with my wife's help fastened the two sides together.
Once all the glue was dry I started fitting drawers and drawer slides.
Then fitting drawer fronts...
You can see from the picture that I used playing cards to center the drawer fronts, then some truss head screws through the pre-drilled holes for the handles to hold the front in place. After the fronts were held in place I added four more screws from the inside to permanently hold the fronts in place.
I couldn't resist getting an early glimpse of what the filing cabinet would look like with hardware.
It was not April 13th and I finally got the case into my finishing room - my wife's home office. Fortunately it is well ventilated and if I applied finish right after we finished work for the day by the next morning most of the smell was gone. I also moved the cabinet into my home office for the day so new smells wouldn't be volatizing near her during the day. It was extra effort but worth it.
I finally finished it mid May. It took an evening to reattach the false fronts to the drawers, reattach all the drawer slides, and put the leveling feet on but it was finally done and tucked into a corner next to my 3d Printer.
Overall I am satisfied with this project. There are a number of things I pointed out here and a few things I didn't that could have gone better. However, my primary goal was to have a filing cabinet and I accomplished that goal. It is solid and I have no fear of it falling apart any time soon.
I ended up needing to design my own cabinet from scratch because I could not find any plans I could buy. I found 2 drawer and desk based cabinets but not 4 drawer cabinets. I designed this cabinet based off of a broken 4 drawer filing cabinet my in-laws had. Theirs was all veneered plywood. Since I wanted to use solid wood my construction challenges would be different. If I can find the time I am going to write up these build plans for this and publish them here for free.