Secondary Operations & Assembly

Secondary Operations Assembly Services

SPI supports secondary operations and light assembly after CNC machining, injection molding and rapid manufacturing. We can coordinate insert installation, joining, marking, inspection, packaging and shipment preparation so finished parts move from individual components to a controlled, shipment-ready condition.

Project review starts with released requirements. CAD, drawings, BOM data, CTQ features, cosmetic criteria, labeling and pack-out requirements are reviewed before the secondary-operation route is confirmed.

Request Assembly Support → Send drawings, 3D CAD, BOM, quantity and assembly or packaging requirements for review.
Secondary Operations Assembly Services for Parts
Drone assembly projects can combine CNC-machined structures, injection-molded housings, 3D-printed prototype parts and secondary operations before final inspection and shipment preparation.
Upstream Parts CNC / Injection / Rapid Manufacturing
Secondary Work Inserts / Joining / Marking / Finishing Coordination
Verification Assembly / Visual / Agreed Inspection Checks
Release Labeling / Packaging / Shipment Preparation
Upstream Part Routing

Supported Part Types

Secondary operations can be planned for molded, machined, 3D-printed and mixed-component parts when downstream work is defined by the released drawing, BOM, assembly sequence and shipment requirements. The service scope begins after the primary part-manufacturing route has been established.

  • Molded Plastic Parts

    Housings, covers, brackets and molded components may continue from injection molding into insert installation, joining, marking or pack-out support.

  • CNC Machined Components

    Machined brackets, frames, plates and precision components can move into deburring, finishing coordination, hardware installation, identification or light subassembly.

  • 3D-Printed and Prototype Parts

    3D-printed housings, fixtures and prototype components can continue into hardware installation, fit checks or light assembly when a development build needs to validate interfaces before the production manufacturing route is finalized.

  • Mixed Plastic and Metal Subassemblies

    Programs combining molded housings, machined inserts, fasteners or purchased hardware can be reviewed as one controlled assembly and release sequence.

  • Electronics Housings and Mechanical Parts

    Enclosures, carriers, brackets and related mechanical parts for electronics manufacturing may require inserts, labels, hardware, inspection and protective packaging before shipment.

Drone part assembly with CNC machined components, molded plastic housings and insert installation support
Drone assemblies can combine CNC-machined structural parts, molded housings, prototype components, inserts, fasteners and purchased hardware within one controlled downstream assembly route.

Scope boundary: this page covers downstream manufacturing support after the primary part process. CNC machining, injection molding, 3D printing and other upstream manufacturing routes retain their own process, tolerance and production requirements. For broader process selection and upstream manufacturing routes, review SPI’s manufacturing capabilities .

Assembly Operations

Insert Installation and Simple Assembly

After the molded or machined part is released, secondary operations can add retention, joining, identification or basic subassembly functions before final inspection and pack-out. The operation route is selected from the released drawing, material, mating geometry, access, cosmetic requirements and the required assembly result.

  • Threaded Insert Installation

    Heat-set, press-fit or other specified inserts can be installed where the released part design and material support the required retention and assembly condition.

  • Ultrasonic Welding and Heat Staking

    Plastic components may be joined or retained with the specified process when mating geometry, material behavior and access are suitable for a controlled secondary operation.

  • Hardware and Fastener Installation

    Screws, pins, clips, bushings and approved purchased hardware can be installed as part of a defined assembly sequence.

  • Light Mechanical Subassembly

    Molded and machined components can be combined into simple subassemblies when part orientation, revision status, fit and required verification points are clearly defined.

Integrated drone manufacturing and assembly with 3D printed prototypes, CNC machined parts and molded components
Drone programs can move from prototype parts and machined structures to molded components, hardware installation and coordinated light assembly within one downstream manufacturing workflow.
Representative Workflow

Prototype-to-Assembly Workflow for a Drone Program

A development build may begin with 3D-printed housings or fixtures for interface checks, then move to CNC-machined structural components and molded production housings. Once the released parts are available, threaded inserts, fasteners and purchased hardware can be installed, followed by light mechanical assembly and the agreed fit or orientation checks. The same workflow can then continue into identification, packaging and shipment release without separating each downstream step into an unrelated supplier handoff.

  1. 3D Prototype
  2. CNC Structure
  3. Molded Housing
  4. Inserts & Hardware
  5. Light Assembly
  6. Release & Pack-Out

Keep handoffs controlled when several operations depend on the same revision or assembly references. Coordinating part manufacturing, secondary fixtures, assembly steps and release checks under one workflow can reduce interpretation gaps during pilot builds and recurring production.

  • Revision status
  • Part orientation
  • Fixture reference
  • Assembly sequence
  • Release criteria
Secondary Process Coordination

Surface Finishing and Secondary Process Coordination

Secondary operations may include finishing, deburring, polishing, marking or other post-process work needed before assembly and shipment. SPI can coordinate these steps with the released part requirements so finish, identification and downstream handling remain connected to the same project definition.

Edge & Surface Preparation

Deburring and Polishing

Machined or molded components can be reviewed for edge cleanup, polishing or other preparation steps where handling, appearance or downstream assembly requirements justify additional processing.

Coating Coordination

Anodizing, Plating and Coating

Where the drawing or approved specification defines a finish, SPI can coordinate the required external finishing step and keep the released finish requirement linked to the part and shipment records.

Identification

Marking and Labeling

Part numbers, revision labels, identification marks or agreed graphics can be coordinated when location, appearance and release requirements are clearly defined.

Downstream Readiness

Finish-to-Assembly Handoff

Secondary processing should be completed before assembly or pack-out where coating, surface condition, marking or handling could affect fit, appearance or release status.

This page coordinates finishing as part of the downstream workflow; it does not replace finish-selection engineering. When appearance, corrosion resistance, wear, coating thickness or substrate compatibility drive the decision, use the dedicated finishing guidance.

Review Surface Finishing Guide →
Scope boundary: programs requiring controlled cleanroom or sterile final assembly, dedicated high-speed automation, specialized ICT/FCT systems, firmware-linked release, or regulated pharmaceutical-style packaging should be reviewed as separate supplier responsibilities before quotation.
Pack-Out & Release Control

Sorting, Packaging and Traceability

Secondary operations do not end when the assembly step is complete. Parts may still require sorting, identification, kit verification, protective packaging and shipment preparation so the correct revision, lot and assembly condition remain identifiable through final pack-out.

  • Sorting and Kit Verification

    Parts, hardware and simple subassemblies can be checked against the released BOM or pack-out requirement before they are grouped into kits or shipment quantities.

  • Label and Revision Matching

    Part labels, identification marks and package labels can be matched to the required part number, revision or customer-defined identification before shipment.

  • Lot and Traceability Control

    Where required by the program, lot identity and supporting manufacturing or inspection status can remain associated with the packed parts through the agreed release workflow.

  • Protective Packaging and Shipment Readiness

    Trays, bags, separators or other agreed protection can be used to reduce cosmetic damage, mixing or handling risk during storage and shipment.

Drone assembly components prepared for inspection, packaging and traceability support before shipment
Drone assemblies and related components can move through inspection, kit verification, identification, protective packaging and traceability checks before shipment release.
Identity Part / Revision / Lot
Contents Quantity / Hardware / Kit Match
Protection Tray / Bag / Separator / Surface Protection
Release Label / Pack-Out / Shipment Readiness
Traceability depth is project-specific. Lot control, label format, serialization, inspection-status linkage and packaging records should be defined by the drawing, purchase order or agreed customer requirement rather than assumed as one fixed documentation package.
Final Release Check

Final Inspection Before Shipment

After secondary operations and assembly are complete, final release should confirm that the shipped condition matches the agreed drawing, assembly and order requirements. The exact inspection scope depends on the project, but the final check should close the gap between completed secondary work and shipment approval.

Assembly

Assembly Completeness and Fit

Required inserts, fasteners, joined parts or other specified components are checked for presence, orientation and the agreed assembly condition.

Appearance

Visual and Surface Condition

Customer-visible surfaces, marking and secondary-process areas are reviewed against the defined cosmetic or workmanship requirements where those criteria apply.

Requirements

Agreed CTQ and Inspection Checkpoints

Defined dimensional, fit or functional checkpoints are verified according to the drawing, inspection plan or other agreed project requirements before release.

Release

Shipment Release Verification

Final release confirms that part identity, approved quantity and the agreed shipment condition match the released order requirements before the shipment is cleared for dispatch.

This section covers the final release checkpoint, not SPI’s complete inspection and quality-control system. Detailed CMM inspection, calibration, CTQ control, quality documentation and broader production-release methods remain within SPI’s Quality Assurance framework.

Review Quality Assurance →

Inspection depth, sampling, reports and release records are project-specific and should be defined by the drawing, purchase order or agreed quality plan rather than assumed as one fixed package for every assembly program.

Assembly Support Review

Request Secondary Operations and Assembly Support

If your molded or machined parts require inserts, joining, marking, finishing coordination, light assembly, inspection or controlled pack-out, send the released project requirements before the downstream route is finalized. SPI can review the required operations together with part revision, BOM, assembly sequence, quality checkpoints and shipment requirements.

Submit Assembly Requirements →

Project scope and documentation should be confirmed before quotation where customer-specific assembly or pack-out requirements apply.

  • Current 2D drawing and 3D CAD with revision level.
  • BOM, purchased hardware, inserts or mating components.
  • Required secondary operations or assembly sequence.
  • CTQ, cosmetic, marking, label or inspection requirements.
  • Quantity, packaging, traceability and shipment requirements.