Chapter 6 — Cleave and the Force at the Edge

Cleave is a small living-wedge — a chunky-cartoon triangular-prism-creature with broad flat back + narrow sharp edge. NOT a person, NOT gendered. The wedge IS the character.

Cleave is small, warm-grey-and-cream, deeply purposeful-about-force-concentration, fond-of-saying-”push forward; split it apart. force concentrated to a sharp edge.” Cleave’s signature feature is the triangular-prism shape — physically embodying the wedge.

This is load-bearing. Cleave embodies the wedge primitive — the simple machine that converts forward force into outward splitting-force. Most novices know wedges from knives + axes but don’t know HOW they work. The wedge is essentially TWO inclined planes back-to-back. When pushed forward, the wedge’s sloping sides exert outward (perpendicular) force on the material being split. The narrower the wedge angle, the greater the force-multiplication (and the less material splitting per stroke). The wider the angle, the less MA but more material movement. Same force-distance trade as every other simple machine. Wedges include: knives, axes, plows, chisels, scissors (each blade is a wedge), needles. Note: the wedge has obvious application to cutting, and at ages 9-14 we frame this carefully — as a TOOL whose USE requires safety + skill, not as anything frightening. Cleave’s whole work is making the force-concentration mechanism explicit AND framing wedge-use with safety-mindfulness consistent with MakerForge Mill’s tool-safety anchor.

Cleave is clear: “Push forward; split it apart. Force concentrated to a sharp edge. I’m two inclined planes back-to-back. Push my back; my sides spread outward, splitting whatever I’m wedged into. Same force-distance trade — focused at the edge.”

Cleave teaches the wedge scaffolds:

• Definition. (Two inclined planes back-to-back. Forward force becomes outward splitting force.)
• Mechanical advantage. (MA = wedge-length / wedge-width-at-thick-end. Long thin wedge = high MA but slow splitting. Short fat wedge = low MA but fast splitting.)
• Examples. (Knives — kitchen tools requiring adult-supervised use. Axes — for splitting wood. Plows — for opening soil. Chisels — for woodworking. Needles — for sewing. Scissors — paired wedges.)
• Safety framing. (LOAD-BEARING: wedges are TOOLS. Sharp tools require safety practices — same Mill’s tool-safety checklist applies. Wedges are not weapons; they’re tools. Frame use accordingly.)
• Daily ubiquity. (Door-stops are wedges. Hammers driving nails involve wedge-action. Even your front teeth are wedges. The mechanism is everywhere.)
• Compound-mechanism realization. (Like Auger, Cleave is a compound — two inclined planes combined. Most useful tools are compound machines.)

Cleave was made in the village toolmaker’s shop (MachineForge framing). Wedges in human use predate metalworking — sharpened stones used as splitting tools are documented from at least 2.5 million years ago (Oldowan tradition). The wedge is one of humanity’s oldest tools.

Cog (mentor) had asked: “What is a wedge?” Cleave: “Push forward; split it apart. Force concentrated to a sharp edge.” Cog: “You are appointed.”

In the workshop, Cleave demonstrates carefully with a tree-log + a wooden splitting-wedge. “Watch.” Cleave shows the wedge positioned against the log; a wooden mallet strikes the wedge’s back. Each strike drives the wedge forward, splitting the log progressively. “My narrow edge concentrates the force. As I drive forward, my sloping sides push the log halves apart. Force-multiplication at the edge.” Cleave says: “I am Cleave. The primitive I teach is the wedge. The move is push forward; force splits outward at the sharp edge. Tools require respect; tools require safety practices.”

Cleave is gentle and careful: “Wedges are TOOLS. Sharp tools require adult supervision + safety practices — same as Mill teaches. Never play with knife-wedges. Never test edge-sharpness with your finger. Use safely; learn carefully; respect the tool.”

“Push forward; split apart. Force at the edge. Respect at the handle.”

Voice register

Living-wedge (non-human, non-gendered). Purposeful-about-force-concentration, fond of safe-demonstration with mallet + log. NEVER frames wedges as weapons; ALWAYS centers tool-respect + safety-mindfulness consistent with MakerForge Mill.

Sample lines:

• “Push forward; split it apart.”
• “Force concentrated to a sharp edge.”
• “Tools require respect; tools require safety practices.”

Arc

• Kit 6 — Anchor.
• Kits 7-16 — Recurring (every wedge-related project routes through Cleave with safety framing).

Relationships

• Builds on Ramp: Wedge is two inclined-planes back-to-back. Cleave is Ramp paired.
• Cross-app design-language continuity with MakerForge Mill’s tool-safety anchor: Both apps share the safety-first framing for sharp/forceful tools.

Cultural-sensitivity gate

LOAD-BEARING tool-respect framing — wedges are tools, not weapons. Safety-mindfulness consistent with MakerForge Mill. Adult-supervision required for sharp-edge wedges. Off-ramps for kids uncomfortable with edge-tools.

Cultural-context note

The wedge as canonical simple machine is NGSS K-2-PS3 + MS-PS3 curriculum. Oldowan stone-wedges date 2.5M years ago — among the oldest documented human technologies. Living-wedge mascot designed to BE the mechanism + safety-framed via warm tool-respect register.