AssemblyOperations
Expert guidance for MNMUK assembly departments - Low Volume Assembly (LVA) and Full Manufacturing Line (FML).
Workflow Routing
Department Note: LVA = Low Volume Assembly. FML = Final Module Line (also referred to as Full Manufacturing Line) — a paced, takt-driven production line distinct from LVA's high-mix flexible configuration.
| Workflow | Trigger | File |
|---|---|---|
| Kitting | "kitting process", "kit preparation" | Workflows/Kitting.md |
| TorqueOperations | "torque process", "fastening" | Workflows/TorqueOperations.md |
| LineSetup | "line setup", "SMED", "changeover" | Workflows/LineSetup.md |
| Traceability | "serial number", "traceability", "build record" | Workflows/Traceability.md |
Department Overview
LVA (Low Volume Assembly)
Characteristics:
- Manual and semi-automated assembly
- High-mix, low-volume production
- Skilled operator dependency
- Flexible workstation configuration
Core Processes:
| Process | WI Reference | Description |
|---|---|---|
| Kitting | WI-LVA-001 | Component staging and verification |
| Assembly Sequence | WI-LVA-002 | Step-by-step build instructions |
| Torque Operations | WI-LVA-003 | Fastener installation and verification |
| Electrical Assembly | WI-LVA-004 | Harness routing and connection |
| Functional Verification | WI-LVA-005 | In-process and final testing |
| Traceability | WI-LVA-006 | Serial number and build record management |
FML (Full Manufacturing Line / Final Module Line)
Characteristics:
- Paced production line
- Takt time driven
- Higher automation level
- Standardized work critical
Core Processes:
| Process | WI Reference | Description |
|---|---|---|
| Line Setup/Changeover | WI-FML-001 | SMED methodology |
| Takt Time Monitoring | WI-FML-002 | Cycle time tracking and alerts |
| Error-Proofing Verification | WI-FML-003 | Poka-yoke checks |
| End-of-Line Test | WI-FML-004 | Final inspection and release |
Key Concepts
Torque Operations
Critical Requirements:
- Torque tools calibrated per MSA skill requirements
- Joint classification: Safety Critical / Critical / Standard
- Torque sequence specified for multi-fastener patterns
- Angle monitoring for yield-controlled fasteners
Torque Verification:
| Joint Class | Verification Method | Frequency |
|---|---|---|
| Safety Critical | 100% electronic monitoring + audit | Every joint |
| Critical | Electronic monitoring | Every joint |
| Standard | Operator verification | Per WI |
Poka-Yoke (Error-Proofing)
Categories:
| Type | Description | Example |
|---|---|---|
| Prevention | Physically prevents error | Keyed connectors |
| Detection | Detects error before next step | Vision system |
| Warning | Alerts operator to potential error | Light/sound alarm |
Verification Requirements:
- Daily poka-yoke verification at shift start
- Documented on verification log
- Failed poka-yoke = line stop until resolved
Line Balancing
Takt Time Calculation:
Takt Time = Available Production Time / Customer Demand
Example:
- Available time: 450 min/shift (7.5 hrs minus breaks)
- Demand: 50 units/shift
- Takt time: 9 minutes/unitBalancing Principles:
- No station cycle time exceeds takt
- Minimize operator waiting time
- Balance workload across stations
- Identify and address bottlenecks
SMED (Single Minute Exchange of Die)
Changeover Phases:
| Phase | Activities | Target |
|---|---|---|
| External Setup | Done while line running | Maximize |
| Internal Setup | Done while line stopped | Minimize |
| Adjustment | Fine-tuning after restart | Eliminate |
SMED Steps:
- Document current changeover
- Separate internal vs external activities
- Convert internal to external where possible
- Streamline remaining internal activities
- Standardize and practice
IATF 16949 Alignment
| IATF Clause | Requirement | Assembly Coverage |
|---|---|---|
| 7.1.3.1 | Plant, facility, and equipment planning | Line layout, workstation design |
| 7.1.4 | Environment for operation | Assembly area conditions |
| 8.5.1.1 | Control plan | Assembly control plan elements |
| 8.5.1.2 | Standardized work | Work instructions, operator instructions |
| 8.5.1.3 | Verification of job setups | Setup verification procedures |
| 8.5.1.5 | Total productive maintenance | Equipment maintenance |
| 8.5.1.6 | Management of production tooling | Tool/fixture control |
| 8.5.2 | Identification and traceability | Serial numbers, build records |
| 8.5.6.1 | Control of changes | Change implementation |
| 8.6.2 | Layout inspection | First article inspection |
Reference: ~/projects/work/docs/compliance/IATF16949_Compliance_Plan.md
Integration with Other Skills
| Skill | Integration Point |
|---|---|
| AutomotiveManufacturing | Process documentation standards |
| Pfmea | Assembly PFMEA development |
| Controlplan | Assembly control plan elements |
| Msa | Torque tool calibration studies |
| Spc | In-process monitoring charts |
| Tribalknowledge | Operator expertise capture |
| Skillsmatrix | Operator competency tracking |
Work Instruction Structure
Standard format for assembly work instructions:
# WI-[DEPT]-[SEQ]: [Title]
**Revision:** [Rev]
**Effective Date:** [Date]
**Applies To:** [Part numbers / product families]
## Purpose
[Brief description of operation]
## Safety Requirements
- [ ] PPE required: [list — e.g., safety glasses, gloves, steel-toe boots, hearing protection]
- [ ] Torque tool handling: ensure tool is within calibration, never exceed rated capacity
- [ ] Hazards: [list — e.g., pinch points, sharp edges, heavy components]
- [ ] Emergency procedures: [reference]
> **PPE is mandatory** before beginning any assembly operation. Operator must verify and don all specified PPE prior to first step.
## Materials and Tools
| Item | Specification | Qty |
|------|---------------|-----|
| [Component] | [P/N] | [#] |
| [Tool] | [Description] | [#] |
## Procedure
1. [Step with photo/diagram reference]
- Visual Aid:  *(photo or diagram required for each key step)*
- Torque: [value] Nm
- Quality check: [description]
2. [Next step with photo/diagram reference]
- Visual Aid: 
## Quality Checkpoints
| Step | Check | Method | Acceptance |
|------|-------|--------|------------|
| [#] | [What] | [How] | [Criteria] |
## Traceability
- Serial number location: [where]
- Data to record: [list]
- System entry: [how]Common Assembly Issues
| Issue | Likely Cause | Resolution |
|---|---|---|
| Torque not achieved | Worn fastener, cross-thread | Inspect, replace fastener |
| Component interference | Tolerance stack-up | Check dimensions, escalate to engineering |
| Missing component | Kit error | Return to kitting, add poka-yoke |
| Connector not seated | Alignment issue | Verify orientation, check for damage |
| Test failure | Assembly error or component | Follow troubleshooting tree |
Examples
Example 1: New product assembly setup
User: "We're starting production of a new damper variant next week"
-> Review BOM and assembly sequence
-> Verify kitting process (Workflows/Kitting.md)
-> Confirm torque specifications
-> Set up traceability in system
-> Create/update work instructions
-> Train operators (link to Skillsmatrix)Example 2: Line balancing issue
User: "Station 3 is bottlenecking the line"
-> Calculate current takt time
-> Document cycle times at each station
-> Identify tasks that can be redistributed
-> Update line balance chart
-> Revise work instructions
-> Re-train affected operatorsExample 3: Changeover improvement
User: "Changeover is taking too long on Line 2"
-> Document current changeover (Workflows/LineSetup.md)
-> Video the changeover
-> Separate internal vs external activities
-> Convert internal to external where possible
-> Create standardized changeover procedure
-> Practice and time improvements