What's inside
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A sliding-cover puzzle tray keeps a partly finished jigsaw protected from dust, pets, and accidental bumps without making you lift a lid every time you want to work. This build uses a plywood base, low side rails, and a thin cover that slides in grooves along the long sides. It suits a beginner with a saw and drill; a router makes the grooves neater, but you can cut them with a table saw or adapt the design with screwed-on guide strips.
Contents
Choose the size and design
Measure the largest puzzle you expect to assemble, then add about 2 inches to both dimensions for working room. A tray with a 24-by-36-inch inside area will fit many 1,000-piece puzzles, but check the puzzle maker’s finished-size dimensions before cutting. The cover needs to span the tray’s inside width and slide along its length.
The plan below uses a 1/2-inch plywood bottom, 3/4-inch-thick side rails, and a 1/4-inch plywood cover. Keep the tray shallow: rails about 1 inch tall leave enough space for pieces without making the cover bulky. The sliding cover takes up some vertical clearance, so allow at least 1/8 inch between the cover and the puzzle pieces.
Materials and tools
For a tray with a 24-by-36-inch inside area, buy a 1/2-inch plywood panel large enough for the bottom, two long rails, and two end rails; 1/4-inch plywood for the cover; and four pieces of straight 3/4-inch stock for the rails. Use cabinet-grade plywood if you want a smoother surface and cleaner edges. Construction plywood costs less and works, but patches and voids can make it harder to get a flat, tidy tray.
You’ll also need wood glue, 1 1/4-inch screws, sandpaper, a square, a drill, and a saw. A router with a straight bit is the most direct way to make the cover grooves. If you don’t own one, a table saw with a suitable blade can make the same cuts; don’t buy a router just for this project if a simpler guide-strip design meets your needs.
Wear eye protection when cutting, and support large plywood pieces so they cannot tip or pinch the blade. A pair of bar clamps helps hold the frame square while the glue sets, though careful assembly with a square and temporary bracing can work without them.
Choose a groove method
| Method | Advantages | Trade-offs |
|---|---|---|
| Router-cut grooves | Clean, continuous tracks; easy to fit a 1/4-inch cover | Requires a router and a straightedge guide; test the depth on scrap |
| Table-saw grooves | Fast and consistent on long rails | Requires safe handling of narrow stock and multiple passes if the blade is too thin |
| Screwed-on guide strips | No groove-cutting tool needed; easy to repair | Cover edges remain more exposed, and strips can snag if not aligned |
For occasional home use, guide strips are a reasonable low-cost choice. For a smoother slide and a cleaner look, cut grooves in the rails. Whichever method you use, test the cover fit before gluing the frame together.
Cut and prepare the parts
Cut the plywood bottom to the desired inside dimensions, then cut the rails to form a frame around it. For a 24-by-36-inch interior, the bottom measures 24 by 36 inches. The two long rails run the full 36-inch length; the end rails fit between them, so cut each to 24 inches minus twice the rail thickness. With 3/4-inch rails, that is 22 1/2 inches.
Cut the cover so it fits inside the rail grooves with roughly 1/16 inch of side-to-side clearance. Its length should allow it to slide far enough to expose most of the tray while staying captured in the tracks. A cover around 24 by 35 inches is a starting point for this size, but measure your assembled frame and groove positions before making the final cut. Sand the edges lightly; a cover that is too tight will bind as wood moves with humidity.
Cut the cover grooves
Mark a groove on the inside face of each long rail, about 1/4 inch below the top edge. Make the groove wide enough for the actual cover thickness, often slightly over 1/4 inch, and about 1/4 inch deep. Plywood thickness varies, so measure the cover rather than trusting its nominal size. Practice on a scrap of the same rail stock first.
With a router, clamp a straightedge and make a shallow test cut. With a table saw, set the fence and blade height carefully, then make multiple passes if needed to widen the groove. Keep both grooves at the same height. A mismatch can make the cover twist or jam. If using guide strips instead, fasten one strip along the inside of each long rail, leaving a track wide enough for the cover to slide between the strip and the rail.
Assemble the tray
Dry-fit the rails around the bottom and check that the corners meet cleanly. Apply a thin bead of glue where the rails meet the plywood, then secure the frame with screws driven through the rails into the bottom. Drill pilot holes to reduce splitting. Check both diagonals; if they differ by more than about 1/8 inch, adjust the frame before the glue cures. Wipe away squeeze-out before it hardens, especially inside the grooves.
Slide the cover into the tracks before installing an end stop. When it moves freely and stays captured, add a small stop block at the end of the rail so the cover cannot slide completely out. Leave the opposite end open for access, or add a removable stop if you want the cover to come off for cleaning.
Sand, finish, and test
Sand the tray and cover with 120-grit paper, then 180-grit for a smoother feel. Ease sharp corners, but don’t round over the cover edges enough to make them slip out of the grooves. Apply a water-based clear finish if you want protection from spills, or leave the tray unfinished for a simpler project. Keep finish out of the tracks; even a small ridge can make the cover drag. Let the finish cure fully before using the tray.
Test the slide across its full travel. If it binds, look for glue, finish, or a groove that narrows in one spot. Sand the cover edges lightly rather than forcing it. If the cover rattles, thin felt pads placed away from the track can reduce noise, but pads inside the grooves may increase friction. Store the tray flat; a warped bottom can make an otherwise well-fitted cover difficult to move.