What's inside
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A desktop book rack is a useful small project for scrap hardwood or plywood, and adjustable dividers make it more adaptable than a fixed set of slots. This plan makes a rack about 16 inches wide, 7 inches deep, and 8 inches tall, with dividers that slide along two parallel grooves. It suits a beginner comfortable with accurate measuring and a router. You can substitute a drill and chisel, but expect more fitting and cleanup.
Contents
Design and materials
The rack has a flat base, a low back, and three removable dividers. Two grooves in the base guide each divider; matching grooves in the back keep it upright. The grooves run from front to back in the base and from top to bottom in the back. Dividers can then be moved to make wide or narrow spaces for books, notebooks, or mail.
Use ¾-inch plywood for the base and back, and ½-inch plywood for the dividers. Birch plywood is a practical choice because its plies are stable and its faces take paint or clear finish well. Solid wood works too, but seasonal movement and cupping can make sliding parts bind. For a first build, a ¾-inch birch plywood panel is easier to work consistently than a wide solid-wood board.
Cut the base to 16 by 7 inches and the back to 16 by 8 inches. Make each divider 6½ inches deep and 7 inches tall; it will sit just short of the back’s top edge. The base grooves should be ⅛ inch wide and about ¼ inch deep. The back grooves should match the divider thickness and be about ¼ inch deep. Measure your actual plywood thickness before cutting: “½ inch” plywood may be slightly thinner, and a snug fit is better than a forced one.
| Groove approach | Best for | Trade-off |
|---|---|---|
| Router with straight bit and guide | Repeatable, clean grooves | Fast, but needs careful setup and secure clamping |
| Drill and chisel | Basic home toolkits | Cheaper if you own the tools, but slower and less uniform |
| Fixed dividers in dadoes | A rack that rarely needs reconfiguration | Strong and simple, but not adjustable |
Tools and layout
You’ll need a saw, square, tape measure, clamps, sandpaper, and either a router with a straight bit or a drill and sharp chisel. A small ⅛-inch straight router bit can cut the base tracks if it is rated for your router and material. A router table is not necessary; a straightedge clamped to the work is enough.
Mark the base grooves as pairs, not as isolated lines. For each divider position, cut two grooves ½ inch apart, centered across the base’s width. The divider’s bottom edge will have two matching tongues, each ⅛ inch thick and ½ inch long, that engage those tracks. This paired arrangement prevents the divider from twisting. Mark the back grooves in line with the base pairs. Leave at least 1½ inches between groove pairs so the rack can hold ordinary books without crowding.
Cut and groove the parts
Cut the base and back square. A circular saw and straightedge can produce clean cuts; a jigsaw is acceptable if you sand the edges straight afterward. Check each piece corner to corner for square. If the base is out of square, the back grooves may not line up with the tracks.
Clamp the base flat and secure a straightedge as a router guide. Make a test groove in scrap of the same plywood first. Set the depth to ¼ inch, then take two shallow passes rather than forcing the bit through the full depth at once. Cut the paired tracks straight from the front edge toward the back, stopping about ½ inch short of the back edge. On the back panel, route matching vertical grooves from the top edge down, stopping ½ inch above the bottom. Those uncut margins keep the grooves from breaking out at the edges.
If using a drill and chisel, drill a row of shallow holes inside each marked groove, keeping them within the lines. Pare the waste to depth with the chisel, checking the width often with a scrap divider. This method works, but uneven walls can let a divider lean or jam.
Make the adjustable dividers
Cut three divider blanks to 6½ by 7 inches. At the bottom of each, mark two ½-inch-long tongues to fit the paired base tracks. Trim away the material between and outside the tongues with a saw, then test them in the grooves. For the back edge, leave the full width intact and check that it enters both matching back grooves without forcing.
Adjustability depends on fit. A divider should slide with light hand pressure but not rock noticeably. If it binds, sand the tongue faces or widen a tight spot with a few controlled chisel strokes. Don’t loosen every track to fix one oversized divider; that creates wobble across the whole rack. Sand cut edges to 180 grit and ease sharp corners slightly.
Assemble and finish
Dry-fit the base, back, and dividers before applying glue. Set the back upright at the rear of the base and check it with a square. Apply a thin bead of wood glue along the joint and clamp the back in place. Reinforce the joint from underneath with three evenly spaced 1¼-inch screws, drilling pilot holes first to reduce the chance of splitting the plywood edge. Keep screws clear of the base tracks.
Leave the dividers unglued so they remain adjustable. Test every position after the glue dries, and remove any squeeze-out that would block a track. Sand the outside surfaces through 120 and 180 grit. A water-based clear finish dries quickly and keeps the rack’s natural color; paint hides plywood edges better. If you use finish inside the grooves, apply it sparingly and retest the dividers after drying, since even a thin coat can tighten the fit. For a painted project, water-based primer and paint are a reasonable low-odor option for indoor use.
Troubleshooting and safe use
If a divider leans, check whether both base tongues are seated and whether the back grooves align with the tracks. A small alignment error can make the divider twist as it slides. If it slides too freely, add a thin veneer shim to one groove wall or remake the divider slightly wider; avoid thick felt, which can bunch up and drag.
Clamp work securely when routing, keep hands out of the bit’s path, and make shallow passes. A desktop rack is not a shelf for heavy stacks: keep it on a stable surface and load books upright rather than pushing a tall, uneven pile against the back. For a lighter-duty organizer for paperbacks, the same design can be made from ½-inch plywood, but the base and back will flex more. Use ¾-inch stock if you expect larger hardcovers or frequent divider changes.