AssemblyOperations

Expert guidance for MNMUK assembly departments - Low Volume Assembly (LVA) and Full Manufacturing Line (FML).

Workflow Routing

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)

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/unit

Balancing Principles:

1. No station cycle time exceeds takt
2. Minimize operator waiting time
3. Balance workload across stations
4. 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:

1. Document current changeover
2. Separate internal vs external activities
3. Convert internal to external where possible
4. Streamline remaining internal activities
5. 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]
- [ ] Hazards: [list]
- [ ] Emergency procedures: [reference]

## Materials and Tools
| Item | Specification | Qty |
|------|---------------|-----|
| [Component] | [P/N] | [#] |
| [Tool] | [Description] | [#] |

## Procedure
1. [Step with photo/diagram]
   - Torque: [value] Nm
   - Quality check: [description]

2. [Next step...]

## 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 operators

Example 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