Original bounded enclosure evidence report · scope revision53

Saved original-report · Original source proposals/2026-10-09-continuation/research-bfs/section01/02-enclosure.md · original SHA256 6d53bc8eca421c72131da795ef0f343988413eeb3c6410144d75ec74ee29a9d9 · immutable published snapshot proposals/research-artifact-archive/4d004a362aeb/6d53bc8eca421c72131da795ef0f343988413eeb3c6410144d75ec74ee29a9d9.md · SHA256 6d53bc8eca421c72131da795ef0f343988413eeb3c6410144d75ec74ee29a9d9

Bounded research/review evidence. This artifact does not certify physical manufacturing closure or later changed routes.

Enclosure

Part · evidence research draft · closure open. The enclosure locates and protects the phone's completed modules and establishes their mechanical and thermal interfaces. BFS item 2/5, level 1 after handset, scenario coordinated-discovery-v1, selected discovery-enclosure-v1, chosen revision 52 and scoped snapshot revision 53. This reviews the selected machined-aluminum hypothesis; it does not expand the mechanical lane's shared tools.

Required capability

One incorporated enclosure, plus trial/loss stock not yet specified. External dimensions, wall thickness, cavity datums, connector openings, flatness, surface finish, screw/bond interfaces, alloy/temper, stiffness, impact behavior, corrosion resistance, thermal contact, battery swelling clearance, antenna geometry and ingress performance are not yet specified. The handset's flagship-equivalent capability and real-network requirement are inherited. Enclosure RF interaction must be accepted in the assembled antenna geometry; a geometrically fitting metal box is insufficient.

Immediate inventory and allocation

The selected seven requirements remain explicit.

At the consumer page, preserve known operation requirements carried by precision-machines: milling machine, compatible cutting-tool set and workholding, manual drive, flat reference/surface, independent dimensional references, suitable lubricant/water, ventilation, protection and containers. These are nested machine requirements, not extra enclosure feedstocks. For the actual machining job, tool wear, cutting-zone chip removal, cutting fluid or an explicitly researched dry-cut strategy, chip capture and cleaning stock must be allocated rather than assumed supplied by tool construction. cutting-tool-set, water-supply, solvents-lubricant, containers, metalworking-waste-tray, metalworking-protection and workshop-surfaces are reuse candidates; lubricant suitability is unknown. Dedicated duty quantities remain open.

If the chosen radio arrangement requires insulating windows or separated metal sections, incorporate compatible insulating material and joining interfaces. Check polymers, molding-equipment and the antenna owner before requesting an enclosure-insert identity; connector-insulator describes another consumer and is not automatically interchangeable. No insert is added as a mandatory fact before geometry selection. Fasteners joining frame subassemblies or cover seals need allocation to this route versus final assembly. Mechanical-load, joint-integrity, thermal and RF acceptance fixtures remain explicit unresolved capabilities, with joint-pull-test-fixture, thermal-test, antenna-tuning and rf-test as candidates.

Bounded making outline

The following is a design inference pending a frozen drawing and machining trials. Choose a stock composition/temper capable of meeting strength, corrosion, machining and thermal demands. Existing aluminum-stock produces unspecified electrolytic/cast metal; it is not evidence for a chosen wrought alloy. A route through alloy-stock, forming or heat treatment may become necessary, but these alternatives must be separately evaluated before substituting stock.

Establish workpiece datums on a stable surface and independently inspect the blank. Cut/face it with compatible cutters, hold it against the expected forces, and machine cavities/openings while supporting thin walls. Preserve appropriate machining allowance between rough and finishing stages. Clear chips without scoring sealing surfaces; deburr edges and verify no sharp contact threatens cables or the battery. Clean, dry and protect the finished piece before joining. If inserts are chosen, prepare their material-specific contact geometry, install/bond or co-mold them, and recheck geometry after thermal processing. Install only the seals and adhesive interfaces assigned to this subassembly; final phone seals remain with their actual consumer.

Apple describes a cellular iPad enclosure containing plastic antenna splits, co-molded into machined aluminum and then finished by CNC machining. That is a primary-source precedent for metal/plastic RF integration, not evidence that this phone requires Apple's geometry, alloy, processing parameters or flatness specification. Apple enclosure account [E1]

Sandvik identifies rigid workholding, machine stability, short tooling and chip removal as milling considerations. Its guide concerns commercial tooling and damped assemblies, so it supports the obligation to handle machining forces/chips without qualifying our earlier manual machine or selecting a cutter. Sandvik milling guide [E2]

Acceptance, reuse and alternatives

Independently measure datums, interfaces and sealing surfaces against the actual drawing, accounting for gauge uncertainty. Check assembly fit, joint retention and damaging edges. Validate enclosure/antenna performance with completed radio fixtures and relevant mechanical/thermal loads. Anodizing or another coating is optional until corrosion, conductivity and surface demands are frozen; adding it entails its own chemical process, masking and waste requirements. No coating performance is assumed from a decorative appearance.

The existing machines, metrology and surfaces are preferred reuse candidates, but none has a qualified range, precision or build-order guarantee. A forged/cast near-net blank could reduce removed stock while adding forming/casting obligations. A polymer enclosure could simplify RF isolation but changes stiffness, heat transport, joining and polymer-manufacture burdens. These are coherent separate alternatives, not mixed inventories or proven shorter paths. The current metal hypothesis remains selected and open.

Manual drives avoid assuming imported CNC electronics, yet manual machining accuracy for this geometry is unproven. If automated machining is selected, declare its earlier physical controller, host, loading interface, power and black-box motion program. An enclosed loop involving enclosures, machines and metrology cannot be cured by renaming this handset enclosure.

Next review: freeze drawing/material, qualify stock and manual machine capability, allocate operation consumables and RF interfaces, and compare independent acceptance resources. No natural terminal or successful enclosure manufacture is claimed.