{"revision":"r1","units":"mm","status":"Concept only: dimensions and modules are proposed; no fabrication or fit validation.","groups":[{"id":"chassis","number":"01","name":"Lower chassis","machine":"CNC router / laser prototype","ownership":"Make","plan":"6 mm plywood plate; 220 \u00d7 280 mm. Route mounting holes and cable slots after motor selection. Laser-cut cardboard first to check packaging. Confirm stock and cutter limits.","lesson":"Keep the plate stiff around motor mounts; a visually flat plate still needs a loaded deflection check.","process":"cnc"},{"id":"mounts","number":"02","name":"Motor mounts & rails","machine":"FDM \u2192 optional Bridgeport","ownership":"Make","plan":"PETG fitting brackets with through-bolts, washers and metal motor clamps. If creep or flex changes wheel alignment, use staff-approved machined aluminum brackets. Bandsaw only rough-cuts approved stock.","lesson":"Orient load-bearing walls deliberately. Do not carry motor loads through thin printed tabs or rely on infill alone.","process":"print"},{"id":"drive","number":"03","name":"Wheels, gearmotors & encoders","machine":"Purchased assemblies","ownership":"Buy","plan":"Two 100 mm rubber wheels, matching hubs, encoder gearmotors and shaft hardware. Exact motors not selected. Confirm shaft radial-load capacity and hub offset.","lesson":"Choose torque at operating speed, not stall torque. Encoder speed is not ground speed when the tire slips.","process":"buy"},{"id":"caster","number":"04","name":"Rear caster","machine":"Purchased caster + FDM spacer","ownership":"Buy + make","plan":"One rear ball caster forms three-point support. Print a spacer after measuring the actual caster height.","lesson":"Locate the loaded center of mass inside the contact triangle and retain enough weight on the drive wheels.","process":"buy"},{"id":"battery","number":"05","name":"Power module","machine":"Bought pack / electronics bench","ownership":"Buy + assemble","plan":"Protected battery pack and matched charger, fuse, motor-power cut switch, regulator and strain-relieved wiring. Low removable tray; no custom cell assembly.","lesson":"Motor supply and regulated logic branch separately. Check voltage sag and logic resets while accelerating.","process":"electronics"},{"id":"deck","number":"06","name":"Service deck & standoffs","machine":"Laser cutter / FDM","ownership":"Make","plan":"3 mm approved plywood service deck, PETG standoffs and removable fasteners. Keep ports, connectors and the battery accessible.","lesson":"Separate packaging from structure: removing the cover must not disturb wheel alignment or sensor calibration.","process":"laser"},{"id":"electronics","number":"07","name":"Control & motor interface","machine":"Soldering / microscope bench","ownership":"Design + buy","plan":"Own MCU carrier and sensor/connector board; bought dual H-bridge sized for motor startup/stall limits. PCB fabrication route awaits staff confirmation.","lesson":"MCU runs encoder speed loops, watchdog and contact stop. A higher-level computer sends bounded velocity commands.","process":"electronics"},{"id":"sensor","number":"08","name":"Range / optional camera mount","machine":"PETG FDM + bought sensors","ownership":"Make + buy","plan":"Two low front range sensors; an optional camera on a bolted short mast. Camera box in model is an envelope, not a selected product.","lesson":"Measure blind zone and sensor-to-body transform. Keep the mast short; vibration and cable pull alter calibration.","process":"print"},{"id":"contact","number":"09","name":"Compliant contact bumper","machine":"TPU FDM + PETG guide","ownership":"Make","plan":"Separate TPU pad mechanically captured on a rigid guided bumper. Print TPU flat to reduce supports; hard stops limit travel. No AMS material change required.","lesson":"Compliance protects contact and spreads load; it does not measure force. Start with switches, then add a calibrated load cell.","process":"print"},{"id":"force","number":"10","name":"Contact sensing & stops","machine":"Electronics bench / FDM","ownership":"Buy + integrate","plan":"Two travel guides, return springs, microswitches and optional load cell + amplifier. Shown as conceptual envelopes; rated load and deflection remain to be selected.","lesson":"Design a load path and overload bypass. Motor current is only a secondary signal, not calibrated contact force.","process":"electronics"}],"parts":[{"group":"chassis","name":"Lower plywood plate","vertices":[[-110.0,59.0,-140.0],[110.0,59.0,-140.0],[110.0,65.0,-140.0],[-110.0,65.0,-140.0],[-110.0,59.0,140.0],[110.0,59.0,140.0],[110.0,65.0,140.0],[-110.0,65.0,140.0]],"faces":[[0,3,2,1],[4,5,6,7],[0,4,7,3],[1,2,6,5],[0,1,5,4],[3,7,6,2]],"color":"#bba077","explode":[0,0,0]},{"group":"mounts","name":"Longitudinal rail","vertices":[[-96.0,65.0,-120.0],[-84.0,65.0,-120.0],[-84.0,81.0,-120.0],[-96.0,81.0,-120.0],[-96.0,65.0,120.0],[-84.0,65.0,120.0],[-84.0,81.0,120.0],[-96.0,81.0,120.0]],"faces":[[0,3,2,1],[4,5,6,7],[0,4,7,3],[1,2,6,5],[0,1,5,4],[3,7,6,2]],"color":"#557d77","explode":[0,15,0]},{"group":"mounts","name":"Motor clamp 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