Joints

14 joint types — how parts are connected in verified assemblies. Interface contracts (how parts CAN interact) are described separately.

butt_pin_joint butt-split halves of one long section aligned by end-face press pins — identical outlines verified, pins on sockets compression_gap_joint split-clamp compression interface: posed mating planes keep the declared gap, saddles form one circle with equal radii dovetail_joint slide-on payload adapter: male dovetail foot in the female socket groove, clearance band per side, lift-out retention by undercut, friction-only axial hold (v1) drop_in_screen drop-in strainer basket over the collector drain: seats in the sump ledge, encloses the drain (no bypass), anti-shift, tool-free, zero-bypass fail-safe unless allow_emergency_bypass fluid_joint water/nutrient line handover: outlet hands to inlet downhill with matched channel widths (VF-3 adapters are the first client; the physics is ready) lap_flow_joint flush module-to-module water handover: the upstream lap lip continues the floor plane into the downstream FLOORED lip-seat receiver — dZ = 0, controlled face gap, deliberate tip slot, no downward leak (closed below) lid_seat lid plug drops into the shell interior with declared clearance and seats on the rim without bottoming out press_fit_pin_pair pins on B press into receiving bores on A: coincident in the pose, thicker than the bore by the interference profile_perch rail bottom groove seated on the aluminum profile carrier (straight reference): width fit and capture verified locally; row-level truth in assembly.profile_support_full_length removable_insert drop-in cassette in the rail seat: clearance band, tool-free rim, contact window inside the channel with pulse-only reach and a guaranteed drain gap saddle_hang auxiliary verification joint: the adapter's saddle straddles and rests on the rail wall in the pose the fluid joint set — never realizes a fluid port screw_joint bolt-circle/line screw joint: clearance holes on B over thread pilots on A, verified coincident in the pose snap_joint cantilever snap hooks into receiver windows: undercut and insertion strain verified, engagement probed in the pose tongue_groove module line alignment: groove swallows tongue in the clearance band without bottoming; channels stay parallel, level, and same-facing across the joint