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A slotted plywood corner clamp that flexes to squeeze a mitered frame joint closed instead of just pinning the corner.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Base Slotted to let the jaw sections flex inward. | 1 | 1/2" × 6" × 10" | 1/2" plywood | ☐ |
| Jaw blocks Angled face; counterbored bolt slot faces DOWN against the base. | 4 | 3/4" × 1 1/2" × 3" | Hardwood scrap | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 1/2" plywood, partial sheet The flexing base. | 1 sheet | ☐ |
| Hardwood scrap (jaw blocks) | 1 board ft | ☐ |
| Carriage bolts, 1/4" x 2" | 4 each | ☐ |
| Wing nuts | 4 each | ☐ |
| Washers | 8 each | ☐ |
Overall cost: $. Lumber varies by region, species, and season, so we give a band rather than a figure.
Tools: Table Saw. Materials: 1/2" plywood, partial sheet
Cut the plywood base with slots that let the fixed jaw sections flex inward under pressure.
Tools: Bar / Pipe Clamps. Materials: Hardwood scrap (jaw blocks)
Glue the angled hardwood jaw blocks to the base, making sure the counterbored bolt slot on each block faces down against the base, not up.
Tools: Drill / Driver
Drill through the base and jaw blocks for the carriage bolts.
Tools: Drill / Driver. Materials: Carriage bolts, 1/4" x 2", Wing nuts, Washers
Assemble the clamp with the carriage bolts, washers, and wing nuts.
Clamp a mitered corner by tightening the wing nuts, which draws the flexing jaw sections together across the miter.