Revision 2 · untested prototype. This version specifies the connections and fastener schedule, simplifies the shelf, and adds cutting and joint drawings. It has not been physically build tested. Use the drawings for construction; the cover rendering is an illustration.
A mobile table with room to clamp
A 36 × 72-inch plywood top sits on a 30 × 66-inch upper frame, leaving 3 inches of overhang on every side. The default finished height is 34 inches, including your caster assemblies. Four legs are laminated from pairs of 2×4s. Two lower rails attach directly to the inside faces of the legs and support a rectangular 60 × 23-inch shelf—no shelf notches or special rail-end connectors.
Choose and measure the caster assemblies
Use four matching plate-mounted swivel casters with both wheel and swivel locks. Each mounts beneath an 8 × 8-inch plywood pad. The leg bears on the pad; two steel corner braces connect the pad to opposite side-grain faces of the leg. This avoids relying on screws driven into the leg’s end grain to retain the pad.
Select the caster and corner braces together before cutting the legs. Use 2-inch-leg steel corner braces with two usable holes per flange. Check that the horizontal flanges fit within the pad. On a full-size paper layout, mark the 3 × 3½-inch leg footprint, the two brace footprints, and the caster plate. Select a caster bolt pattern whose heads, washers and tool access clear the leg and braces. A plate that cannot satisfy that layout is incompatible with this mounting detail; do not enlarge holes or weaken the leg to force a fit.
The installed caster assembly height is the distance from the bottom of the wooden leg to the floor. Include the pad thickness, mounting plate, swivel assembly and wheel. Enter that measured height in the calculator. Wheel diameter is not the installed height. All four assemblies must have the same installed height.
Calculate the legs
The upper frame rests on the leg ends. With actual 3½-inch-deep rails and a ¾-inch top, the construction above the legs totals 4¼ inches. Leg length = finished height − installed caster assembly height − 4¼ inches. If your material differs, use the actual combined rail depth and top thickness in a manual calculation; the on-page calculator assumes the specified 4¼-inch stack.
Example: a 34-inch finished table with a 5-inch installed caster assembly needs eight 24¾-inch leg components. A 6-inch assembly reduces those components to 23¾ inches. Choose and measure hardware before batching those cuts.
Outfeed mode targets a surface ⅛ inch below your equipment’s work surface. For 35-inch equipment and 5-inch caster assemblies: finished table height is 34⅞ inches and leg length is 25⅝ inches. Confirm the appropriate clearance, miter-bar path, fence movement and support position for your actual equipment.
Cut list
Actual finished dimensions in inches. “2×4” means actual 1½ × 3½-inch stock here. Part A is calculated; all other parts are fixed. Four J square blanks produce eight triangular gussets. The part IDs match the live cut list.
| ID | Part | Qty | Length × width × thickness (in) |
|---|---|---|---|
| A | Leg lamination | 8 | Calculated × 3½ × 1½ |
| B | Upper long rail | 2 | 66 × 3½ × 1½ |
| C | Upper ends and crossmembers | 5 | 27 × 3½ × 1½ |
| D | Lower shelf support rail | 2 | 66 × 3½ × 1½ |
| F | Top panel | 1 | 72 × 36 × ¾ |
| G | Shelf panel | 1 | 60 × 23 × ¾ |
| H | Caster mounting pad | 4 | 8 × 8 × ¾ |
| J | Gusset square blank | 4 | 8 × 8 × ¾; cut diagonally |
Materials and fasteners
Allow ten straight 2×4×8-foot boards and two nominal 4×8 sheets of ¾-inch plywood. Inspect for twist, splits and damage; the layout is a purchasing allowance, not a guarantee of yield from defective stock. Use wood glue for the leg laminations and multipurpose wood screws intended for wood construction, rather than drywall screws.
| Connection | Specification | Installed quantity |
|---|---|---|
| C ends to B rails | Two #10 × 3-inch wood screws at each of ten rail ends | 20 |
| D rails to leg side grain | Two #10 × 3-inch wood screws at each of four overlaps | 8 |
| Eight J gussets | Five #8 × 1¾-inch wood screws per triangle | 40 |
| F top to frame | #8 × 1¾-inch countersunk wood screws | 12 |
| G shelf to D rails | #8 × 1¼-inch wood screws | 8 |
| Corner braces to leg side grain | Two #10 × 1½-inch wood screws per brace, subject to brace-hole compatibility | 16 |
| Corner braces to pads | Two machine bolts per horizontal flange, with washers and locking nuts; size to brace holes and measured stack | 16 |
| Caster plates to pads | Four through-bolts per caster, with washers and locking nuts; size to caster instructions and measured stack | 16 |
Buy approximately 50 of the 3-inch wood screws, 75 of the 1¾-inch wood screws, and 25 each of the 1¼- and 1½-inch wood screws. Add eight steel corner braces and four casters. Select the 32 machine-bolt assemblies only after laying out the actual hardware. Include washers under heads and nuts where the hardware permits, and enough bolt length for full locking-nut engagement. Keep bolt heads outside the leg’s bearing footprint; all hardware must clear the swivel and brakes.
Cutting layout
Boards 1–2: one B from each. Boards 3–4: one D from each. Boards 5–6: split the five C parts as three and two. Boards 7–10: two A parts per board. The layout accommodates a ⅛-inch kerf and the maximum configured 32¾-inch leg length. Shorter legs leave larger offcuts.
Sheet 1 supplies the top. Sheet 2 supplies the 60 × 23-inch shelf plus four caster pads and four gusset squares. Square and measure the sheets before laying out final cuts. The diagram includes separation for kerfs; keep defects out of the leg connections and caster pads.
Connection details
Assembly sequence
1. Lay out the hardware and record the height. Complete the caster-pad paper layout above. Measure the assembled pad-and-caster height. Select standalone or outfeed mode and write down the calculated leg length. Confirm actual lumber dimensions and plywood thickness before trusting the numbers.
2. Cut and label. Cut B, C, D and the plywood blanks. Cut all eight A laminations to one checked stop setting. Make a sample cut and measure it before batching. Rip and crosscut the shelf to fit between the legs; if the actual opening is tighter, trim only the clearance needed for a slip fit.
3. Glue the legs. Pair A pieces broad face to broad face to form four 3 × 3½-inch legs. Use an even glue layer, align both ends, and clamp against a flat reference until cured according to the adhesive instructions. A twisted lamination makes the entire table harder to square.
4. Assemble the upper frame. Position two C end rails between B long rails. All members stand on their 3½-inch edge. Check a 30 × 66-inch outside rectangle, equal diagonals and no twist. Fasten each C end with two 3-inch screws through B. Put the screw centers about ⅞ inch from the top and bottom edges of B. Use the screw maker’s pilot and countersink guidance, especially near ends and in split-prone stock.
5. Add the crossmembers. Fit the other three C pieces between B. With 1½-inch rail thickness, four equal clear bays are 14⅝ inches. Clamp each crossmember square, then use two 3-inch screws through B into each end. Recheck the diagonals and frame twist after fastening.
6. Seat and brace the legs. Place the frame upside down on a flat surface. Orient the leg’s 3-inch dimension along the 66-inch direction and its 3½-inch dimension along the 30-inch direction. Set each leg end directly against the underside of the frame at a corner, with the outside faces aligned. Add two J triangles per corner on adjacent outside faces. Align the triangle’s 8-inch horizontal edge with the frame top and its vertical edge down the leg. Each gets two 1¾-inch screws into the rail and three into the leg. Keep screws clear of the triangular edges and stagger positions on adjacent faces so the screws do not intersect. The frame bears on the leg ends; the gussets retain and brace the connection.
7. Install the lower rails. Mark a line 8 inches up from the bottom of every wooden leg. Set the top of each D rail on that line, against the inside faces of the two legs on one long side. The 66-inch rail overlaps each end leg by 3 inches. Use two 3-inch screws through the rail into each leg, centered within that overlap, approximately ¾ inch below the rail top and ¾ inch above its bottom. These screws enter leg side grain. Repeat on the other side; check the diagonals and squareness before tightening fully.
8. Install the caster pads. Center H beneath each leg. Fit two corner braces on opposite leg faces with their horizontal flanges resting on the pad. Drill the pad holes from the actual brackets, deburr the holes, and through-bolt those flanges with washers and locking nuts. Fasten the vertical flanges to leg side grain with compatible 1½-inch wood screws. The wooden leg must bear flat on the pad; no bolt head or washer may sit between them. Check the layout before drilling any caster holes.
9. Bolt on the casters. Through-bolt each caster plate to its pad using four bolt assemblies sized to the caster’s instructions. Tighten locking nuts without crushing the plywood. Turn each caster through its full sweep and operate its locks to check clearance. Re-measure from the leg bottom to the floor; if it differs from the value used to cut A, resolve that discrepancy before continuing. Fit all four casters, then turn the table upright with assistance.
10. Fit the shelf. Set G on the two D rails between the legs. It should rest on both rails with a slip fit, not force the legs apart. Install four 1¼-inch screws along each supported shelf edge. Position the screw line over the middle of the 1½-inch rail thickness. Keep unsupported shelf ends free of unnecessary holes.
11. Attach the top. Center F for 3 inches of overhang on every side. Drive six 1¾-inch screws down through the top into each long B rail. With the top’s 72-inch direction as X, suitable positions are X = 9, 18, 27, 45, 54 and 63 inches; the two screw lines are 3¾ inches in from the long edges. Check those locations against the actual frame and other fasteners. Set heads flush, not deeply buried, and leave the top unglued so it can be replaced.
12. Inspect the prototype. Check the finished height on the intended floor with all locks set. Inspect every pad, brace, bolt and screw, and check for rocking or racking before use. Recheck fasteners after initial movement. For outfeed, confirm clear travel with the equipment isolated before using it for support.
Finish and maintenance
Ease exposed edges and sand splinters. If desired, apply a finish suitable for your shop use, keeping it out of glue joints before assembly. Let it cure before glue-ups. Replace a damaged top or caster pad rather than relying on finish to strengthen it. Periodically check locks and fasteners.
Prototype notes
Revision 2 replaces the original four lower stretchers with two side-grain-fastened shelf rails. The shelf is now rectangular and the caster pads are 8 × 8 inches. Do not combine the old shelf, pad dimensions or rail lengths with this revision.
The dimensions and part relationships have been checked digitally, but the mounting hardware has not been purchased or physically fitted, and the table has not been built. No load rating is established. The configured height and caster ranges describe geometry, not tested performance. Prototype checks still include racking, shelf deflection, lock performance, mounting-pad stiffness, hardware clearance, and actual outfeed fit.
Fastener reference: GRK’s multipurpose screw information. Follow the instructions for the actual fasteners, brackets and casters you select; the reference is not a certification of this table.