# Adjustable bench inspection fixture Actual worker outputs; supplied dimensions are design constraints, not measurements. ## Fit and manual motion review · gpt-6-luna - Opening arithmetic agrees with the supplied values: the jaw inner-face gap is 142 − (40 + 18) = 84 mm. If both 3 mm pads sit on the inward-facing jaw faces, the nominal pad-to-pad opening is 78 mm. That pad orientation and placement are assumptions, not fully specified interfaces. - Taking the initial moving-jaw position as X142..160 and positive X as opening, 60 mm of closing travel moves it to X82..100; 60 mm of opening travel moves it to X202..220. The latter overlaps the end-support envelope X212..228 by 8 mm. The proposed travel therefore conflicts with the supplied support envelope in the opening direction unless the later CAD review establishes a compatible arrangement; do not redefine travel or support coordinates here. - At the opening endpoint, the moving jaw also reaches the guide-rod endpoint at X220. The supplied coordinates do not establish rod engagement through the bushings at that limit, nor clearance between the jaw and the right support. - Both guide axes (Y45/135, Z32) pass through the stated jaw envelopes. The proposed Ø10 rods and Ø10.4 bushing bores are dimensionally compatible as nominal diameters, but the 0.4 mm diametral difference is not a validated fit. Bushing orientation, retention, and housing-bore fit are unspecified; the Ø16 bushing OD and Ø16.2 housing bore likewise do not establish retention or acceptable motion. - The Ø8 screw axis (Y90, Z32) lies within the jaw and end-support envelopes. No screw passages through either support or jaw are specified. The screw axis also intersects the fixed-jaw envelope, while the nut-to-moving-jaw interface is not defined. Treat these as unresolved geometry/interface conflicts, not as implicitly provided holes. - The screw spans X8..228, crossing both end-support envelopes (X12..28 and X212..228). A rotating screw needs suitable passages and an axial-retention/bearing arrangement relative to the frame; neither is specified. To translate the moving jaw, the nut must engage the screw and be restrained from rotating relative to the jaw. Thread form, handedness, engagement, and nut retention are unvalidated. - The knob occupies X−2..8 and meets the stated screw start at X8, but the contract gives no attachment or torque-transfer interface. Jaw/pad attachment, support-to-base attachment, and foot attachment are also unspecified. No fasteners or fastening features are included in the supplied contract. - A consistent 20-instance proposed-parts count is possible without adding parts: base 1, guide rods 2, end supports 2, jaws 2, pads 2, bushings 4, lead screw 1, nut 1, knob 1, feet 4; total 20. This is a quantity reconciliation only, not a complete fastening or retention specification. ### Recommendations - Keep the three supplied investigation nodes as the only nodes. For the later LIGHT package, use three modules with two story headings each: (1) structural/support parts—base, supports and feet; guide rods, jaw guidance and bushings; (2) manual adjustment/interfaces—screw, nut and knob; jaw/pad opening and travel; (3) assembly and proposed checks—assembly sequence; geometry/interface checks. This is an outline, not the package draft. - In the separate CAD review, check the stated opening and pad placement, both travel endpoints, jaw-to-support overlap, rod engagement at endpoints, and all rod/screw passages through supports and jaws. Preserve the locked coordinates and report any resulting conflicts rather than shifting parts. - Check the proposed bushing housing and rod clearances from the supplied nominal diameters, while treating fit, retention, and sliding behavior as unvalidated. Check the screw/nut engagement, nut anti-rotation, screw axial retention, support passages, and knob attachment as explicit unresolved interfaces. - Use a proposed assembly/check flow that first resolves support and attachment interfaces, then guide and jaw interfaces, then screw/nut/knob interfaces, and finally performs separate CAD geometry checks. Any later physical bench checks would be proposals only; no motion, holding force, repeatability, or physical build is established here. ### Concerns - The 60 mm opening-direction travel conflicts with the right end-support envelope by 8 mm, and the moving jaw reaches the guide-rod endpoint at that limit. - The supplied contract does not define passages for the rods or screw, screw bearings/axial retention, nut anti-rotation/retention, threads, knob attachment, pad placement/attachment, support attachment, or foot attachment. - The displayed 1 mm base clearance is not tied to a fully described interface. Jaw minimum Z11 above the base top at Z10 gives a nominal 1 mm gap, but the contract does not clarify whether that is the intended clearance or how it is maintained. - The simplified nominal diameters do not establish acceptable fits, friction, travel, or manual operation. No measured geometry, manufacturing readiness, or engineering validation is claimed. ## Assembly, BOM and proposed checks · gpt-6-luna - Candidate BOM, counting only named parts: base ×1; guide rods ×2; end supports ×2; jaws ×2; pads ×2; bushings ×4 (inferred allocation); lead screw ×1; nut ×1; knob ×1; feet ×4. This totals 20 meaningful components only if four bushings are used. The contract specifies bushing dimensions, not quantity or allocation; do not treat ×4 as locked. - Opening arithmetic: jaw inner-face gap is 142 − (40 + 18) = 84 mm before pads. If 3 mm pads are placed on both inward-facing jaw surfaces, the nominal gap is 78 mm. Pad mounting faces and placement remain assumptions for later CAD review. - The stated 60 mm travel conflicts with the end-support envelope at the opening end: the moving jaw at X202..220 overlaps the support at X212..228 by 8 mm. At the closing end it is at X82..100. Do not redefine travel or infer usable travel from these positions. - Both Ø10 rods run on X through the jaw/support region, and the Ø8 screw axis at Y90/Z32 crosses the support and jaw envelopes. The contract does not specify the required rod passages, bushing locations/retention, screw passages or bearing/axial-retention interfaces. These overlaps may be intended interfaces, but are not validated clearances. - The nut’s 18 mm outer diameter and 14 mm length, the screw’s simplified thread, and their engagement/retention in the moving jaw are not defined as a validated interface. The knob and screw meet at their stated X extents, but the coupling or retention method is unspecified. - No fasteners or fastening positions are specified for pads, supports, knob, bushings or feet. The proposed BOM therefore counts named components only; adding required fastening or retention hardware later would change the component count. ### Recommendations - Keep this review within the three supplied investigation nodes: fixture-question (use case), fixture-dimensions (locked constraints and conflicts), and fixture-concept (candidate parts and later checks). Preserve the planned three-module/two-story organization in the later package; do not add investigation nodes here. - Use the BOM above as a proposed count, explicitly labeling the four-bushing allocation as an inference made to reconcile the 20-part target. Resolve bushing quantity and placement, and whether any fastening/retention hardware is included, before treating the count as settled. - Proposed assembly/check flow, for later CAD review and a future non-destructive bench check only: confirm interfaces and travel envelope → place feet and base → locate supports and guide rods → fit/retain bushings if their allocation is resolved → assemble fixed jaw and pads → fit moving jaw to rods → engage nut and screw → attach knob → inspect access and unloaded manual motion. Do not force movement through a suspected interference. - Before any physical check, review the support overlap at the 60 mm opening position and the rod/screw passages in CAD. Do not call the stated 60 mm travel usable until that conflict and the interfaces are resolved. - Proposed non-destructive checks, not performed: visually inspect access around a suitable de-energized sample without applying clamping load; observe jaw position and approach from the intended inspection directions; turn the knob slowly with the fixture unloaded and stop if binding or interference is evident. Do not claim repeatability, holding force, or successful sample inspection from these checks. - Keep any later bench observation qualitative and bounded to access, positioning and manual adjustment. Do not perform a sample-damage test or infer load capacity from hand operation. ### Concerns - The opening-end jaw/support overlap is a direct coordinate-envelope conflict with the proposed 60 mm travel, not merely an unspecified tolerance. - Four bushings make the proposed named-part BOM total 20, but neither that quantity nor whether bushings belong in the supports, moving jaw, or elsewhere is locked by the contract. - The defined dimensions do not establish assembly retention, fastening, screw thrust support, threaded engagement, pad attachment, or foot attachment. - The simplified bores and thread, nominal opening, and proposed travel do not establish fit, smooth motion, positioning repeatability, or holding performance. ## Final integration Integrated both worker reviews as one bounded LIGHT proposal. Their coordinate findings agree; neither review establishes a working mechanism.