# Sovereignty Module: Join the Timber

## Complete Primitive Woodworking Joints: From Mortise to Dovetail

Strong joints are the foundation of all woodworking. This campaign covers joint types, cutting techniques, fitting, and applications from furniture to timber framing.

### Chapter 1: Joint Types

| Joint | Strength | Difficulty | Tools Needed | Best For |
|---|---|---|---|---|
| Butt joint | Very low | Very low | Saw | Rough construction, temporary |
| Lap joint | Moderate | Low | Saw, chisel | Frames, simple furniture |
| Mortise and tenon | Very good | Moderate | Saw, chisel, mallet | Furniture, timber framing |
| Dovetail | Excellent (tension) | High | Saw, chisel | Drawers, boxes, casework |
| Tongue and groove | Good | Moderate | Saw, plane, router | Flooring, paneling |
| Dado/housing | Good | Low-moderate | Saw, chisel | Shelving, bookcase |
| Bridle joint | Good | Moderate | Saw, chisel | Frames, light structures |
| Finger joint (box joint) | Very good | Moderate | Saw, chisel | Boxes, decorative |
| Scarf joint | Good | Moderate | Saw, chisel, plane | Lengthening timber |
| Pegged joint | Very good | Low (with drill) | Drill, mallet | Securing M&T, timber framing |

### Chapter 2: Mortise and Tenon

Mortise and tenon construction: 1) Mark mortise location on receiving piece. 2) Mortise width: 1/3 the thickness of the receiving piece. 3) Mortise depth: 2/3 to 3/4 the width of the receiving piece. 4) Drill out waste with brace and bit (or auger). 5) Clean walls with chisel (flat, square walls). 6) Mark tenon on mating piece. 7) Tenon thickness: matches mortise width exactly. 8) Tenon length: matches mortise depth (or slightly shorter). 9) Cut tenon cheeks with saw (cut on waste side of line). 10) Cut tenon shoulders with saw. 11) Test fit: tenon should slide into mortise with hand pressure. 12) Too tight: pare tenon with chisel. 13) Too loose: glue a shim or start over. 14) Peg through joint for mechanical lock (drill through assembled joint, drive hardwood peg).

| Variation | Application | Strength | Difficulty |
|---|---|---|---|
| Through mortise and tenon | Visible joint, timber framing | Excellent | Moderate |
| Blind mortise and tenon | Hidden joint, furniture | Very good | Moderate |
| Wedged tenon | Extra-strong, decorative | Excellent | Moderate-high |
| Tusk tenon | Knockdown furniture, removable | Very good | Moderate |
| Haunched tenon | Door frames, wide rails | Very good | Moderate-high |
| Double tenon | Wide rails, heavy loads | Excellent | High |
| Drawbored tenon | Self-tightening, no glue needed | Excellent | Moderate |

### Chapter 3: Dovetail Joints

Dovetail cutting: 1) Mark baseline on both pieces (depth of joint = thickness of mating piece). 2) Mark tails first (on the piece that shows end grain on the front). 3) Tail angle: 1:6 for softwood, 1:8 for hardwood (steeper = stronger but weaker in softwood). 4) Cut tail sides with dovetail saw (cut on waste side). 5) Remove waste between tails with coping saw and chisel. 6) Use cut tails as template to mark pins on mating piece. 7) Cut pin sides with dovetail saw. 8) Remove waste between pins with chisel. 9) Test fit: joint should go together with light mallet taps. 10) Gaps indicate poor marking or cutting (practice improves this). 11) Glue and assemble (dovetails are strong even without glue). 12) The mechanical interlock resists pulling apart (ideal for drawers).

### Chapter 4: Hand Tool Techniques

| Tool | Function | Technique | Key Skill |
|---|---|---|---|
| Crosscut saw | Cut across grain | Let saw do the work, light pressure | Straight, square cuts |
| Rip saw | Cut along grain | Steeper angle, moderate pressure | Following the line |
| Chisel | Pare, chop, clean joints | Bevel down for paring, bevel up for chopping | Sharp edge, controlled force |
| Mallet | Drive chisel, assemble joints | Strike chisel squarely | Controlled force |
| Marking gauge | Scribe lines parallel to edge | Set to exact dimension, scribe firmly | Consistent depth |
| Marking knife | Precise layout lines | Score wood fibers for clean cuts | Accuracy |
| Square | Check 90-degree angles | Reference against known flat edge | Verify frequently |
| Brace and bit | Drill holes | Steady pressure, keep vertical | Straight holes |
| Hand plane | Flatten, smooth, dimension | Adjust blade depth, plane with grain | Flat, smooth surfaces |

### Chapter 5: Timber Framing Joints

| Joint | Location | Function | Complexity |
|---|---|---|---|
| Mortise and tenon (pegged) | Post to beam | Primary connection | Moderate |
| Scarf joint | Beam to beam (lengthening) | Extend beam length | Moderate |
| Lap joint | Crossing beams | Beams cross at same level | Low-moderate |
| Birdsmouth | Rafter to plate | Rafter sits on wall plate | Low |
| Tongue and fork | Post to beam | Strong, decorative | High |
| Hammer beam | Roof truss | Spans wide openings | Very high |

### Reference Card

1. The mortise and tenon is the king of joints (it has been used for thousands of years because it is strong, versatile, and reliable; master this joint first). 2. Sharp tools make clean joints (a dull chisel tears wood and produces sloppy joints; sharpen before every session). 3. Mark from the piece, not from measurements (use the actual mating piece to mark joint dimensions; this eliminates measurement errors). 4. Cut on the waste side (always cut on the waste side of your line; you can pare to the line, but you cannot add wood back). 5. The dovetail resists pulling apart (the angled tails mechanically lock the joint; this is why dovetails are used for drawers). 6. Drawboring self-tightens (offsetting the peg hole in the tenon from the mortise pulls the joint tight when the peg is driven; no glue needed). 7. Test fit before gluing (always dry-assemble the joint to check fit; adjustments are impossible after glue sets). 8. Practice on scrap wood (every new joint type requires practice; cut ten practice joints before cutting the real piece).