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:

• 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]
• Hazards: [list]
• Emergency procedures: [reference]

Materials and Tools

Procedure

1. [Step with photo/diagram]

   • Torque: [value] Nm
   • Quality check: [description]

2. [Next step...]

Quality Checkpoints

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