Prototype Assembly Verification: Fit Checks, Fasteners, Fixtures and Build Reports

Prototype assembly verification is a controlled build used to confirm that individual parts, purchased components and hardware can be assembled into a working product as intended. It checks more than whether each part matches CAD. The build reveals interference, excessive gaps, inaccessible fasteners, unstable locating features, cable-routing conflicts, seal problems, tool-access limitations and tolerance combinations that may not be obvious in a digital model.

A successful prototype build should produce two results: a physical assembly and a reliable engineering record. Without part revisions, measured conditions, torque values, photos and issue dispositions, the team may know that “something did not fit” but cannot confidently correct the design or reproduce the build.

This guide explains how to plan prototype assembly verification, control parts and hardware, perform fit checks, use fixtures and gauges, evaluate fasteners and interfaces, document deviations and turn prototype findings into production-ready design actions.

Quick Answer: What Is Prototype Assembly Verification?

Prototype assembly verification is a structured process for building and evaluating a product or subassembly before production release. The team confirms that:

• The correct part revisions and purchased components are present.

• Components locate against the intended datums and interfaces.

• The assembly sequence is practical.

• Tools and hands can reach every operation.

• Fasteners, inserts, snaps, seals and connectors engage correctly.

• Gaps, flushness, alignment, movement and clearances meet defined limits.

• The product can be disassembled or serviced when required.

• Build issues are recorded with evidence and assigned actions.

The output is commonly called a prototype build report, assembly verification report, fit-check report or engineering build record.

Why CAD Assembly Is Not Enough

Digital interference checking is valuable, but real parts behave differently from ideal solid models.

Physical assemblies include:

• Manufacturing tolerances and geometric variation.

• Surface finish, paint, plating and coating thickness.

• Burrs, radii, print supports and tool-access limitations.

• Flexible walls, seals, wires and hoses.

• Screw float, insert movement and clamp deformation.

• Material shrinkage, warpage and residual stress.

• Purchased-component variation.

• Human assembly force and tool orientation.

A CAD model may show zero interference while a painted cover binds at a corner, a cable cannot bend through the planned route or a screwdriver collides with a wall. Prototype verification converts these unknowns into observable conditions before production tooling and work instructions are finalized.

Define the Purpose of the Build

Different prototype builds answer different questions. State the primary objective before choosing processes, quantities and inspection.

Form Verification

Form verification evaluates shape, proportions, visual balance, surface transitions and perceived quality. Appearance models may use nonproduction materials if the objective is visual approval.

Fit Verification

Fit verification checks mating geometry, hole alignment, gaps, flushness, engagement, clearance and stack-up. Dimensional fidelity and stable datums are more important than final material performance.

Functional Verification

Functional verification evaluates movement, load, sealing, torque, thermal behavior, electrical interfaces and other performance. Material, process and assembly condition must represent the intended use closely enough for the test conclusion.

Assembly-Process Verification

This build focuses on sequence, fixtures, tools, access, cycle time, operator risk and mistake prevention. Parts may already be functionally approved, but the manufacturing process still needs development.

Serviceability Verification

Service builds check disassembly, replacement, inspection and reassembly. Hidden fasteners, destructive adhesives and trapped cables often create service problems that are missed during the initial build.

One prototype can support several objectives, but each conclusion should state what the prototype can and cannot prove.

Establish Clear Pass/Fail Criteria

“Fits well” is not a measurable requirement. Define acceptance before the build.

Examples include:

• All screws start by hand for at least two turns without forced alignment.

• The cover-to-housing gap remains between 0.30 mm and 0.60 mm around the specified perimeter.

• Adjacent cosmetic surfaces remain within 0.20 mm flushness after final torque.

• The latch engages at least 0.50 mm and releases below a defined force.

• The shaft rotates through its full travel without contact.

• The seal compresses within the approved squeeze range.

• The connector centerline remains inside the keep-out envelope of the enclosure opening.

• The PCB can be installed and removed without bending beyond the permitted limit.

• Specified service components can be replaced using approved tools within the target time.

Acceptance can also be exploratory. If no limit exists, label the measurement as characterization rather than inventing a pass/fail judgment after the build.

Control the Bill of Materials and Revisions

An assembly result is unreliable if the team cannot identify what was built.

The build package should include:

• Assembly number and revision.

• Bill of materials with part numbers and quantities.

• Drawing and CAD revision for each custom component.

• Purchased-component manufacturer and exact item number.

• Fastener size, grade, finish and source.

• Prototype manufacturing process and material.

• Approved deviations or temporary substitutions.

• Software or firmware version when relevant.

• Build unit or serial number.

Avoid mixing components labelled “latest” or “final” without a controlled release. If an older part must be used, record the difference and which conclusions remain valid.

Prototype Fidelity and Process Selection

The prototype process should match the verification objective.

A mixed-process assembly is often appropriate. For example, machine the precision bearing carrier, print a cable guide, form a sheet-metal chassis and vacuum-cast the cosmetic cover. Document which interfaces are production-representative.

Plan Prototype Quantity

One assembly can expose major interference, but it cannot characterize normal variation.

Quantity should reflect the question:

• One unit: first integration, route check or gross interference review.

• Several units: repeatability, assembly learning and comparison of revisions.

• A small pilot batch: operator variation, process development, basic yield and test distribution.

• Deliberate high/low sets: challenge tolerance limits or material conditions.

If only one unit is available, avoid general statements such as “the design is capable.” Report the observed condition and the remaining uncertainty.

Prepare an Assembly Verification Plan

A concise plan prevents the build from becoming an undocumented workshop exercise.

Include:

1. Build objective and scope.

2. Unit quantity and identification.

3. Controlled BOM and drawing set.

4. Incoming inspection requirements.

5. Assembly sequence.

6. Tools, fixtures and gauges.

7. Fastener torques and adhesive processes.

8. Measurements and acceptance limits.

9. Functional checks.

10. Required photos or video.

11. Hold points for engineering approval.

12. Disassembly or teardown steps.

13. Issue reporting and disposition method.

Assign a build leader and identify who can approve deviations. A technician should not need to guess whether a part may be filed, drilled or forced to complete the build.

Incoming Inspection Before Assembly

Inspect the features that control the build before parts are joined. Otherwise, a failed assembly may be damaged during troubleshooting, making the original cause difficult to identify.

Typical incoming checks include:

• Part number and revision.

• Quantity and visible damage.

• Material and finish.

• Overall dimensions and critical interfaces.

• Hole, slot, boss and insert positions.

• Threads and fastener engagement.

• Flatness or warpage of mating surfaces.

• Burrs, sharp edges and contamination.

• Connector, switch and purchased-component identity.

Do not measure every drawing characteristic unless the plan requires it. Focus on features connected to the assembly question and retain supplier reports where available.

Establish the Intended Datum and Locating Strategy

Parts should locate from deliberate interfaces rather than from whichever edge touches first.

A deterministic locating scheme commonly uses:

• Three contacts to establish a primary plane.

• Two contacts to control translation and rotation on that plane.

• One contact to control the final translation.

Actual products may use pads, shoulders, pins, slots, rails or molded nests. The principle is to constrain required degrees of freedom without overconstraint.

If several tight holes are expected to locate simultaneously, small positional differences can prevent assembly. A round pin plus a relieved or slotted feature often locates accurately while allowing manufacturing variation. Confirm that clearance fasteners are not unintentionally acting as primary locators.

Fit Checks and Interface Verification

Fit checks should isolate each interface before the complete stack hides the source of a problem.

Two-Part Checks

Assemble mating pairs first when practical. Confirm contact surfaces, hole alignment, insertion force, travel and visible gaps.

Subassembly Checks

Build mechanisms, PCB modules, seal sets or fastener groups independently. This makes troubleshooting easier than starting with the full product.

Full Assembly Checks

After subassemblies pass, build the complete product and verify accumulated conditions. Full builds reveal stack-up, sequence and access issues that pairwise checks cannot.

Blueing, Witness and Contact Methods

Transfer film, removable dye, pressure-sensitive film or controlled witness marks can help identify where surfaces contact. Use methods compatible with cosmetic parts and clean the assembly afterward.

Gap and Flush Measurement

Feeler gauges, tapered gauges, dial indicators, optical tools, gap sensors or CMM methods may be appropriate. Define measurement locations and restraint so results can be repeated.

Tolerance Stack-Up in a Prototype Build

Every component can pass individual inspection while the assembly fails because dimensions combine unfavorably.

The build plan should identify:

• The functional closing dimension, gap or alignment requirement.

• Positive and negative contributors.

• Datum and geometric-tolerance effects.

• Coating and seal thickness.

• Fastener float and clamp deformation.

• Temperature and moisture condition.

Measure key contributors and the resulting assembly response on the same unit. Comparing calculated and observed values validates the dimension model. If filing or shimming is needed, measure the amount rather than recording only “reworked to fit.”

Fastener Verification

Fasteners are a common source of prototype build problems because CAD often represents their nominal envelope without the full installation process.

Confirm:

• Thread standard, size, pitch and engagement length.

• Screw grade, head style, drive and finish.

• Washer, nut, insert or locking feature.

• Clearance-hole and counterbore access.

• Tool angle and driver clearance.

• Hand-start capability and cross-thread risk.

• Torque specification and tightening sequence.

• Clamp load effects on gaps and flexible parts.

• Risk of bottoming before clamp-up.

• Required service cycles.

Use calibrated torque tools when torque affects the conclusion. Record actual torque and any prevailing torque rather than stating only “tightened.”

Threaded Inserts and Plastic Bosses

Heat-set, ultrasonic, press-fit, molded-in and self-tapping solutions behave differently.

For a prototype, verify:

• Insert specification and installation direction.

• Boss diameter, depth and support.

• Installation temperature, force or equipment.

• Insert projection and angular alignment.

• Pull-out and torque resistance when required.

• Effect of repeated screw cycles.

• Sink, cracking or local distortion.

A metal insert installed in a printed polymer may not predict performance in injection-molded resin. It can still validate geometry and assembly access if the limitation is documented.

Press Fits, Bearings and Pins

Press-fit verification needs controlled dimensions and installation force.

Record:

• Actual shaft, pin and bore sizes.

• Material and surface finish.

• Lead-in chamfer and edge condition.

• Alignment fixture.

• Installation force versus travel.

• Final position and retention.

• Damage, cracking or raised material.

• Removal requirement.

Hammering a precision component into place may complete a prototype but provides little engineering evidence. Use an arbor press, load cell or controlled fixture when insertion force matters.

Snap Fits, Latches and Clips

Snap interfaces depend on material stiffness, strain, friction, geometry and tolerance.

Evaluate:

• Assembly force and release force.

• Lead-in angle and tool access.

• Hook engagement and overtravel.

• Stress whitening, cracking or permanent set.

• Repeated cycle behavior.

• Temperature and aging condition.

• Risk of false engagement.

• Audible or tactile feedback.

Test the complete mating pair. A snap feature that works against a rigid gauge may behave differently when both production parts flex.

Seals, Gaskets and O-Rings

Seal installation can expose groove, compression and surface problems before a leak test begins.

Check:

• Correct seal material and size.

• Cleanliness and damage.

• Lubrication specification.

• Groove depth, width and fill.

• Stretch or compression during installation.

• Pinch, twist and extrusion risk.

• Mating-surface finish and edge breaks.

• Compression after fastener torque.

• Leak or pressure test condition.

Record whether the seal was reused. A seal damaged during an exploratory build may invalidate later performance results.

Adhesive and Bonded Assemblies

Bonding depends on material compatibility and process control, not only CAD geometry.

A prototype bonding plan should define:

• Exact adhesive and lot.

• Surface preparation and cleaning.

• Primer or activation.

• Mix ratio and dispensing method.

• Bondline thickness and spacers.

• Open time and assembly time.

• Fixture pressure and cure condition.

• Excess adhesive and cosmetic cleanup.

• Destructive or nondestructive test.

Temporary tape or cyanoacrylate can be useful for a route check, but it should not be used to approve a production bond without a representative process.

PCB, Connector and Electronics Integration

Electronics assemblies combine rigid boards, flexible cables, connectors, switches, displays and enclosure features.

Verify:

• PCB mounting-hole alignment and standoff height.

• Connector position relative to external openings.

• Cable bend radius and retention.

• Strain relief and pull direction.

• Clearance to sharp edges, hot parts and moving mechanisms.

• Display and light-pipe alignment.

• Antenna keep-out and metal proximity where relevant.

• Grounding contacts and conductive finishes.

• Thermal pads, heat sinks and compression.

• Battery installation and service access.

Use the real purchased components whenever possible. Connector models from a library may omit latch travel, cable boots or assembly tools.

Cable, Hose and Tube Routing

Flexible routing often looks feasible in CAD but fails because of stiffness, natural bend, connector orientation or assembly sequence.

Check:

• Minimum bend radius.

• Installed length and tolerance.

• Twist and torsion.

• Clip spacing and retention.

• Chafe and pinch points.

• Motion through the full mechanism travel.

• Access for connection and disconnection.

• Pressure, vacuum or fluid compatibility.

• Identification and mistake-proofing.

Photograph routing before the enclosure is closed. Record any temporary tie or manual preload that should become a designed feature.

Cosmetic Gap and Flush Evaluation

Visual quality depends on controlled references, lighting and assembly condition.

Define:

• Which interfaces are customer-visible.

• Gap and flush measurement locations.

• Lighting, viewing distance and orientation.

• Color and gloss standards.

• Acceptable witness lines, fastener marks and tool access.

• Torque and support condition during evaluation.

A gap may change when screws are tightened in a different sequence. Record the sequence and identify whether the variation comes from part geometry, locating strategy or clamp deformation.

Assembly Fixtures and Nests

Fixtures should support repeatability without forcing a bad design to appear acceptable.

Prototype fixtures can:

• Locate parts from functional datums.

• Hold flexible components without damage.

• Align inserts, bearings or pins.

• Control adhesive bondline and cure position.

• Support torque and press operations.

• Protect cosmetic surfaces.

• Verify position with go/no-go features.

3D-printed fixtures are fast and economical, but consider stiffness, wear, temperature and calibration. A fixture that bends can hide or create alignment problems.

Gauges and Measurement Aids

Simple gauges can turn subjective fit into repeatable evidence.

Examples include:

• Go/no-go plugs for hole or connector access.

• Gap steps for cosmetic joints.

• Pin gauges for alignment.

• Torque-angle or insertion-force measurement.

• Functional envelopes representing mating hardware.

• Templates for cable routing.

• Check fixtures that simulate downstream assembly.

Label gauge revision and calibration status. If a gauge represents a virtual condition or worst-case mating part, document the calculation behind it.

Tool Access and Human Factors

A product can be geometrically assemblable but practically impossible to build.

Observe:

• Driver and wrench approach angles.

• Finger clearance and grip.

• Visibility of hidden features.

• Ability to hold several parts simultaneously.

• Risk of dropping hardware into the product.

• Sharp edges and pinch points.

• Left- and right-hand access.

• Need for special tools.

• Operator posture and force.

Record improvised tools, magnets, tape or extra hands. These are signals that a fixture, sequence or design change may be needed.

Assembly Sequence Verification

The sequence determines whether later operations remain accessible and whether fragile parts are exposed to damage.

A useful sequence review asks:

• Which components establish the main datum structure?

• Which cables or seals must be installed before closure?

• Can every fastener be tightened after adjacent parts are present?

• Are adjustments needed before access is blocked?

• Does one operation damage a previously finished surface?

• Can the assembly be tested at intermediate hold points?

• Can rework be performed without complete teardown?

Time each step for process learning, but do not treat an early engineering build as a final production cycle-time study.

Record Force, Torque and Travel

Quantitative data are more useful than comments such as “tight,” “loose” or “hard to install.”

Depending on the assembly, record:

• Screw installation and final torque.

• Press-fit force curve.

• Snap insertion and release force.

• Hinge or mechanism operating torque.

• Spring preload and travel.

• Connector insertion and extraction force.

• Seal closure force.

• Actuator stroke and end stop.

Use instruments with suitable range and resolution. Note test speed, direction and fixture because measured force can depend strongly on method.

Handling Deviations During the Build

Prototype builds often need temporary changes. The key is to control them.

Before modifying a part:

1. Stop and identify the interference or failure.

2. Photograph and measure the original condition.

3. Confirm part numbers and revisions.

4. Decide whether the change is exploratory or approved.

5. Record material removed, shim added or hole changed.

6. Mark the modified component and unit.

7. Recheck affected interfaces.

8. Assign a drawing or design action.

Never let an unrecorded hand modification become part of the “passing” build. The team must know which results apply to the released geometry.

Common Prototype Assembly Problems

Avoid fixing the symptom before the evidence is captured.

Build Issue Classification

Classify issues so the team can prioritize them.

Critical

Safety, regulatory, major functional failure or damage risk. The build or test may need to stop.

Major

Assembly cannot be completed as intended, function is impaired or significant rework is required.

Minor

Assembly completes, but appearance, convenience, documentation or robustness should improve.

Also identify issue ownership: design, supplier, process, purchased component, inspection, documentation or unknown. Classification should guide action, not hide uncertainty.

Root-Cause Analysis

An interference is an observation, not a root cause.

Use evidence to separate:

• Incorrect nominal design.

• Tolerance allocation or stack-up.

• Part outside specification.

• Wrong revision or component.

• Prototype-process limitation.

• Assembly sequence or fixture problem.

• Measurement or datum error.

• Damage or handling.

Measure mating components independently and together. A slot enlarged to complete the build may show how much relief is needed, but it does not prove which original contributor was wrong.

The Prototype Build Report

A good report allows another engineer to understand what was built and reproduce the conclusion.

Recommended sections are:

1. Build Identification

Project, assembly revision, date, location, participants and unit numbers.

2. Objective and Scope

What the build was intended to verify and what was excluded.

3. Configuration

BOM revision, custom-part revisions, purchased components, materials, processes, finishes and approved substitutions.

4. Equipment

Tools, torque devices, fixtures, gauges and measurement equipment.

5. Assembly Sequence

Step-by-step operations, actual sequence changes and hold points.

6. Results

Measurements, forces, torques, gaps, fit checks, functional results and photos.

7. Issues and Deviations

Issue number, severity, affected parts, evidence, temporary action and owner.

8. Conclusion

Passed requirements, failed requirements, conditional conclusions and unverified risks.

9. Actions

Required CAD, drawing, supplier, process, fixture and test changes with responsible person and due date.

The report should not say “build passed” if the assembly required undocumented rework.

Photo and Video Documentation

Photographs should carry engineering context.

Include:

• Unit and part identification.

• Overall orientation.

• Scale, gauge or measured value when relevant.

• Before-and-after condition.

• Contact, interference or damage location.

• Cable routing and hidden interfaces before closure.

• Tool approach or awkward operation.

• Final assembly appearance.

Use annotations to identify the exact feature. Store original files with the report and avoid relying only on compressed messaging-app images.

Redlines and Change Control

Build findings often produce rapid CAD or drawing changes. Control them so the next prototype does not mix assumptions.

A useful redline identifies:

• Document and revision being changed.

• Exact feature and current requirement.

• Proposed change with units.

• Reason and supporting issue number.

• Affected mating parts.

• Whether existing parts can be reworked.

• Verification needed after change.

Release a new revision after review. Do not overwrite the files used for the build, because the report must remain traceable to the tested configuration.

Teardown and Post-Build Inspection

Disassembly can reveal evidence hidden during operation.

Inspect for:

• Fretting, rubbing and contact marks.

• Seal pinch, twist or compression.

• Fastener loosening or thread damage.

• Insert movement.

• Cracks, stress whitening or permanent deformation.

• Cable chafe and connector strain.

• Adhesive coverage and voids.

• Bearing or bushing witness patterns.

• Contamination or fluid paths.

Record the disassembly sequence and any damage created by teardown. Retain critical components for review.

Turning Prototype Findings Into Production Requirements

A prototype workaround is not automatically a production solution.

Translate findings into:

• Updated nominal geometry.

• Drawing tolerances and GD&T.

• Fastener and torque specifications.

• Material and finish requirements.

• Assembly sequence and work instructions.

• Fixture and gauge requirements.

• Supplier control characteristics.

• Inspection and test plan.

• Service instructions.

• Risk analysis updates.

Confirm changes with another controlled build when they affect function or several interfaces.

What Prototype Assembly Can and Cannot Prove

Prototype assembly can prove that a specific set of components was built under recorded conditions and produced observed results. It can strongly validate geometry, access, sequence and interface logic.

It may not prove:

• Long-term reliability from one unit.

• Production yield without representative variation.

• Injection-molded behavior from printed resin.

• Stamping distortion from a machined flat part.

• Final color and gloss from an unfinished model.

• Regulatory compliance without the required material and test evidence.

• Process capability without production-intent data.

State limitations explicitly so stakeholders do not extend the conclusion beyond the evidence.

Prototype Assembly Verification Checklist

• Is the build objective defined?

• Are measurable acceptance limits available?

• Is the BOM revision controlled?

• Are all custom and purchased components identified?

• Are prototype processes and material limitations recorded?

• Have critical incoming interfaces been inspected?

• Does the datum and locating strategy match product function?

• Are assembly sequence, tools and fixtures prepared?

• Are torque, force, adhesive and seal processes specified?

• Are mating parts verified before the full build?

• Are gaps, flushness and alignments measured consistently?

• Are deviations captured before rework?

• Are photos, data and issue owners recorded?

• Has teardown inspection been planned?

• Will findings create controlled design and process actions?

RFQ Checklist for an Assembly Prototype

Provide the prototype supplier with:

1. Complete assembly CAD and exploded view.

2. Controlled drawings for all custom parts.

3. BOM with quantities and revisions.

4. Purchased hardware and manufacturer part numbers.

5. Prototype purpose and acceptance criteria.

6. Required manufacturing process or performance intent.

7. Material, finish, color and cosmetic requirements.

8. Critical dimensions, datums, fits and gaps.

9. Assembly sequence or areas needing supplier development.

10. Fastener torque, inserts, adhesives and seals.

11. Customer-supplied components and shipping condition.

12. Inspection, build report and photo requirements.

13. Functional tests and required fixtures.

14. Delivery quantity, schedule and destination.

For individual machined components, the CNC Machining RFQ Checklist provides a complementary file and quotation guide.

Questions to Ask a Prototype Assembly Supplier

• Will the supplier review the complete assembly or only manufacture parts?

• Which interfaces should be measured before assembly?

• Can purchased components and customer-supplied hardware be managed?

• Who approves deviations during the build?

• Are fixtures, gauges and special tools included?

• Will actual torque, force and gap data be recorded?

• How are units and component revisions identified?

• What photographs and report format are included?

• Can the supplier perform rework, and how will it be documented?

• Will teardown or failure analysis be available?

• Which prototype-process limitations affect the planned conclusions?

• What design changes could simplify production assembly?

Align the report scope before ordering; a shipment of assembled parts is not automatically an engineering verification report.

Frequently Asked Questions

What is the difference between a fit check and functional testing?

A fit check focuses on geometry, alignment, engagement, clearance and assembly. Functional testing evaluates whether the built product performs under defined loads, motion, temperature, pressure or other use conditions. One build can include both.

How many prototype assemblies are needed?

One can identify major integration problems, but several units are usually needed to evaluate repeatability and normal variation. Quantity depends on risk, process fidelity, test plan and available budget.

Should every prototype part be fully inspected before assembly?

Inspect the features that control the assembly and any characteristics required by the plan. Full drawing inspection may be appropriate for critical programs but is not necessary for every exploratory build.

Can 3D-printed parts be used for assembly verification?

Yes. They are useful for geometry, access, routing and many fit checks. Material stiffness, creep, anisotropy, surface and dimensional behavior may differ from production parts, so limit conclusions accordingly.

Why do all parts pass inspection but fail to assemble?

Permitted dimensional and geometric variations can combine unfavorably, or the inspection datums may not represent the assembly condition. Coatings, flexible parts, fastener float and purchased components may also contribute.

Should prototype screws be tightened to production torque?

Use representative torque when clamp deformation, seal compression or retention matters and the prototype materials can tolerate it. If lower torque is necessary to protect nonproduction parts, record the deviation.

What should be included in a prototype build report?

Include objective, configuration, revisions, unit IDs, tools, sequence, measurements, forces, torques, photos, issues, deviations, conclusions and assigned actions.

Can parts be modified during the build?

Yes, when the purpose is troubleshooting or iteration, but capture the original condition first and record every modification. A modified unit cannot verify the unchanged design.

Is a successful prototype build enough for production release?

Not by itself. Production release may also require process capability, tooling trials, validation testing, quality planning, regulatory evidence and representative pilot builds.

Who should attend an assembly verification build?

The right group depends on the product, but design, manufacturing, quality, test and supplier representatives often provide complementary decisions. Assign one build leader and one controlled issue record.

Request a Prototype Assembly Review

Aluprototype supports rapid prototyping services, including CNC machining, 3D printing, vacuum casting, sheet-metal fabrication, finishing and low-volume assembly. A coordinated prototype build can combine several processes and purchased components into one controlled fit and function review.

Send the complete assembly CAD, BOM, part drawings, required quantity, material and finish requirements, mating components, acceptance criteria and desired build-report scope through the Aluprototype request-a-quote page. The engineering team can review process selection, assembly sequence, fixtures, inspection and delivery requirements before manufacturing begins.