AMR Charging Dock Mechanical FAI: Approach Datum, Contact Travel & Floor Interface

An AMR charger can pass a cabinet inspection and still be difficult to commission. The enclosure may be square, the charging head may fit its bracket and every mounting hole may be within a general tolerance, yet the robot can approach from a floor coordinate system that was never connected to the contact position on the drawing. A mechanical first-article inspection has to close that gap.

For an AMR charging dock mechanical FAI, the useful questions are functional: Where is the approved approach datum? In what state is the dock supported? Can the contact carrier move through its released travel without binding? Are the floor anchors, leveling features and docking face related to one controlled coordinate system? What evidence can the integrator reproduce during installation?

The fabricator can manufacture and inspect the mechanical assembly to released drawings, models and an approved inspection plan. The AMR OEM, system integrator and qualified electrical and safety personnel retain responsibility for docking behavior, charging equipment, electrical protection, robot controls, application safety, applicable certification decisions and final validation.

Freeze the as-inspected configuration before measuring

Start by identifying exactly what the first article contains. The same dock can sit differently when measured as a bare welded base, a coated enclosure, a fully assembled mechanical station or an anchored installation. Hinges, doors, charger modules and cable loads can change the state enough to affect a narrow contact window.

The inspection instruction should define the revision of the enclosure, base, contact carrier, wear parts and purchased mechanical components. It should also state whether the dock is free-standing, supported at defined pads, leveled or clamped. If a surrogate charging head or robot-side gauge is used, record its revision and locating method.

Do not mix results from several states into one undifferentiated report. In-process measurements may help control welding and machining, but final acceptance should correspond to the configuration specified on the released drawing. Coating, hardware insertion and final assembly must occur before final-state checks when they can change the measured interface.

Build one datum chain from the floor to the approach window

An effective datum scheme begins at the installed boundary. The primary reference may be defined support pads or a released floor plane. A second datum establishes the longitudinal approach direction, and a third sets the lateral origin. The charging contact location, docking face and any guidance features should be dimensioned from that system rather than from cosmetic cover edges.

The robotics frame FAI and datum checklist is useful for recording support state, datum targets and CTQ evidence. It does not choose the datums for the OEM; it helps the responsible team make its chosen scheme explicit.

Functional question	Drawing input required	Practical FAI evidence
Where should the AMR stop relative to the station?	Released approach axis and stopping reference	Coordinate report or approved interface gauge
What establishes station height?	Floor plane, support pads and leveling state	Height map referenced to defined supports
Where is the contact window?	Contact center or mating envelope relative to dock datums	Position/profile result at released carrier setting
Can site installation reproduce the setup?	Accessible datum targets and anchor pattern	Setup photograph plus annotated inspection record
What may be adjusted?	Slot directions, limits, nominal setting and lock method	Adjustment-range and locked-position check

Inspect contact travel as a controlled mechanical function

Contact travel is more than an end-to-end dimension. The inspection should distinguish the purchased contact mechanism’s internal compliance from movement created by the fabricated carrier. It should identify nominal position, permitted adjustment, working stroke, hard-stop location and the state in which those values are checked.

A low-force shop gauge can move an unpowered carrier through its released range and reveal interference, loose hardware or cable restraint. The gauge must not energize the charger or substitute for the contact manufacturer’s test method. Record the measurement direction and applied setup because side loading can make a linear slide appear tighter than it is during the approved approach.

Check clearance through the complete stroke. Fastener ends, cable retainers, covers and finish buildup can create interference that is invisible in a bare-part inspection. If a service loop moves with the contact block, its length and retained path must come from the released design; the cable must not become an unintended return spring.

Adjustment also needs an acceptance state. A slotted bracket can show the available setup range, but the FAI should report the nominal drawing position unless another position is formally released. Dowel holes, witness edges or a locking plate can preserve the approved setting after commissioning, provided the responsible designer defines them.

Verify the floor interface without hiding installation assumptions

Floor flatness, anchor type and leveling method are site inputs, not properties a sheet-metal supplier can assume. The dock drawing should identify the surfaces that carry load, the holes used for anchors, any grout or shim allowance and the required access for installation tools. If levelers are present, state their approved range and locked condition.

Inspect the base in the same support state used to define the contact height. A base can be flat on a granite table yet distort when only three or four small feet carry it. Conversely, a large welded plate may show harmless free-state variation that disappears under the released support method. The acceptance rule has to match the installation definition.

Anchor and leveling access should be trial-checked with representative tools. Doors, side panels and power hardware must not block tightening or later inspection. Features exposed to the AMR lane should not create unreviewed wheel, cleaning or impact hazards. Those application decisions remain with the site owner and integrator.

Separate shop FAI from site commissioning

Shop FAI verifies the supplied mechanical scope. It can confirm material and finish requirements, weld acceptance, enclosure assembly, anchor pattern, datum relationships, carrier travel, service-panel operation and agreed trial fits. It cannot reproduce the facility floor, robot localization, control logic, live charging circuit or complete safety system unless those activities are separately specified and performed by the responsible qualified parties.

Site commissioning starts from the accepted mechanical record. The integrator surveys the dock relative to the robot map or facility coordinate system, sets any released adjustment, verifies utilities and validates approach, engagement and withdrawal. Fault cases, loss of localization, obstructed contact, electrical isolation and recovery require system-level procedures.

If commissioning changes a slot setting, bracket, cable route or floor position, capture the change. A photograph of a hand-marked setting is not adequate configuration control. Update the approved drawing, setup record and replacement procedure before subsequent stations are built.

Use an acceptance table that leads to a decision

The FAI report should allow a reviewer to decide whether the station is acceptable, requires disposition or needs additional integration work. Avoid entries such as “looks good” or “tested” without the characteristic, state and result.

Acceptance item	Inspect in the shop	Defer to responsible integrator
Base and anchor geometry	Drawing-defined pattern, supports and access	Anchor selection and site floor suitability
Docking-face position	Position to released mechanical datums	Position in facility/robot coordinates
Contact-carrier movement	Unpowered range, interference and hard stops	Live electrical engagement and charging behavior
Adjustment hardware	Range, nominal setting and locking features	Final site setting and commissioning record
Doors and service panels	Fit, retention and mechanical access	Lockout procedure and electrical service safety
Complete AMR approach	Not a fabrication acceptance test	Robot path, controls, fault recovery and validation

Related customer project: AMR Charging Station: Guided Docking and Contact Protection.

Send an RFQ and validation checklist that closes the gaps

Before requesting a build-to-print quote, confirm that the released package includes:

• Assembly model and drawings with revision identifiers.
• Floor plane, support state, approach axis and lateral origin.
• Anchor, leveling, grout or shim assumptions approved by the responsible party.
• Charging-head model and its controlled mechanical envelope.
• Nominal contact position, working travel, hard stops and adjustment limits.
• Robot-side mating gauge or approved surrogate definition, if required.
• Cable path and service loop through the full mechanical stroke.
• Material, weld, finish, masking and grounding-interface specifications.
• CTQ list, inspection method, report format and acceptance authority.
• Door, panel and module-removal checks in the installed access envelope.
• Packaging restraints that do not load the contact carrier.
• Site commissioning owner and route for dispositioning deviations.

This list supports quotation and inspection planning; it is not a system safety checklist. The OEM and integrator must add electrical, controls, fire, facility and application-specific requirements through qualified disciplines.

Keep the supply boundary explicit through final acceptance

The AMR charging station enclosure product page describes the build-to-print mechanical scope: fabricated enclosure, base, brackets, panels and drawing-defined assembly. DRAmetal can review manufacturability, identify missing mechanical interfaces and provide the agreed inspection evidence against the released package.

The OEM or integrator owns the charger selection, contact design, docking tolerance budget, AMR behavior, electrical safety, facility interface, risk assessment, certification decisions and final validation. A mechanical FAI does not transfer those responsibilities to the fabricator.

For a focused review, send the released dock model, datum plan, contact travel definition, floor interface and requested FAI deliverables. A complete input package lets quotation and inspection decisions be made before material is cut, while keeping mechanical workmanship separate from system performance.