Panel glue-up
Glued butt / rub joint
Two long-grain edges, planed straight, rubbed together with glue.
Use when
- You are making a wider panel from narrower boards.
Don’t use when
- Do not rely on it for end grain.
- Keep
- Waste, hatched on the drawing
- Dimension
- Long parts are broken. The 1 in bar is true scale.
Stock
Thickness steppers move by 1/16 in, or 0.5 mm. You can type 3/4 or 1-1/8.
Sizes
| Mark | Size | Rule |
|---|---|---|
| Board thickness | 3/4 in | Both edges need to be the same thickness, or close |
| Edge length | 30 in | The joint is as long as the boards |
| Clamp spacing | 8 in | A clamp about every 8 in, plus one at each end |
| Clamps | 5 | Ends plus the spaces between |
Cut sequence
1Plane both edges straight
A straightedge and a light should show no gap. Spring the joint a hair if the boards are long, so the ends close first.
Setup: Edge length 30 in.
2Rub the joint
Glue both edges, rub them until the glue grabs and the faces are in plane.
Setup: Clamps about every 8 in.
Stop when: The seam is tight and the faces do not step.
3Dry-fit, then glue
Close the joint dry. Check that shoulders and faces meet, then glue. If this is a frame or a box, check both diagonals before the glue grabs.
Stop when: Dry-fit is tight with hand pressure, square, and the diagonals match.
Glue
Long grain to long grain
Strength
furniture
Movement
Long grain to long grain. This is the strongest glue joint there is, if the edges are straight.