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Industry · Manufacturing

Line procedures that survive a retirement, a new shift and a new product.

A setup or changeover is learned by watching the person who has done it for twenty years, and is lost when they leave.

Example: Harlow Precision Components (fictional). Fictional organisation, fictional data, scripted answers.

What makes this sector hard

  • 01A changeover is learned by watching the person who has done it for twenty years, and is lost the day they retire.
  • 02A procedure is revised on the shop floor long before the controlled copy is, so two versions are in use at once.
  • 03Scrap and rework are explained differently by each department, so nobody agrees where the money goes.
  • 04One stopped machine halts a line, then an order, then a customer, and the chain is clear only in hindsight.

See it work on Harlow Precision Components’s own data

Simulation. Five short examples, one for each working area. The wording is scripted and no model is called; the figures are computed from what you decide, and a person’s approval covers exactly what you decided.

Decide which changes become the controlled changeover

What happened
After a new fixture arrived, operators on cell 3 proposed changes to the five-step changeover for the CNC cell. The quality engineer must decide which become the controlled procedure.
The question
Which proposed changes should become part of the controlled changeover, and which of them change what an operator must do? Asked by: Production engineer.
  1. Decide which changes become the controlled changeoverAccept or reject each proposed change. The procedure below is rebuilt from your decisions, and the changes that alter a safety-critical step are marked.Open

    Accept or reject each proposed change. The procedure below is rebuilt from your decisions, and the changes that alter a safety-critical step are marked.

    Accept or reject each change. The text below is rebuilt from the changes you accept, and changes that alter what people must do are marked.

    Changeover, CNC cell 3, version 4 (fictional)

    1. Isolate the machine and apply the lock.

    2. Remove the previous fixture and clean the table.

      Added

      Wipe the locating pins with the lint-free cloth supplied.

      A cleaning detail; nothing that must be achieved changes.

    3. Fit the new fixture and torque the bolts in sequence.

      Reworded Changes what people must do

      Fit the new fixture and torque the bolts in two passes, 20 then 45 Nm.

      Changes how a safety-critical fastening is done; the torque values need engineering sign-off.

    4. Load the programme and run one proof part.

      Reworded Changes what people must do

      Load the programme and run three proof parts.

      Triples the proof checks and adds about six minutes to each changeover.

    5. Release to production once the proof part is passed.

      Removed Changes what people must do

      Removes the release step, so nothing would stop an unchecked part going into production.

    The text after your decisions (5 lines)

    1. Isolate the machine and apply the lock.
    2. Remove the previous fixture and clean the table.
    3. Fit the new fixture and torque the bolts in sequence.
    4. Load the programme and run one proof part.
    5. Release to production once the proof part is passed.

    4 proposed changes: 0 accepted, 0 rejected; 0 accepted change(s) alter what an operator must do.

    The torque change and the extra proof parts alter safety-critical steps, so each needs the quality engineer's sign-off before the procedure changes [S1]. Removing the release step would let parts run unchecked, which a review should not accept [S2].

    The procedure below is rebuilt from your decisions and has 5 steps.

    Relies on: S1 · Operators' proposed changes, cell 3 (fictional)S2 · Controlled changeover procedure, version 4 (fictional)

    The quality engineer decides. Approving issues the rebuilt procedure for operator training and a practical check. It does not change any machine setting or put the procedure on the line by itself.

    Not ready. 4 changes are still undecided. Accept or reject each one first.

Not done here. It does not decide that a torque value or a proof-part count is right: engineering owns the numbers, and the platform shows only what changed.

Where a person decides, and what is never done

Every example above ends with a named person approving it. Approving means exactly what is written here, and nothing more.

  • SOP IntelligenceDecides: The quality engineerApproving lets: Approving issues the rebuilt procedure for operator training and a practical check. It does not change any machine setting or put the procedure on the line by itself.Never: It does not decide that a torque value or a proof-part count is right: engineering owns the numbers, and the platform shows only what changed.
  • ComplianceDecides: The quality managerApproving lets: Approving freezes the evidence index for the audit file and lists what is still open. It does not say the quality system conforms to anything.Never: It does not judge whether the quality system conforms: an auditor does, and the platform shows only what evidence is held and how current it is.
  • Financial IntelligenceDecides: The plant controllerApproving lets: Approving records these assumptions as the case put to the capital committee. It does not order equipment or commit any spend.Never: It does not forecast orders or promise a saving: the freed hours are an estimate on the assumptions shown.
  • Legal IntelligenceDecides: Commercial counselApproving lets: Approving releases these statements as the factual basis of the reply. It does not admit or deny liability, and counsel still settles the wording.Never: It does not decide who is responsible or advise on liability: counsel does.
  • Executive IntelligenceDecides: The operations directorApproving lets: Approving records the dependency picture used to talk to the two customers. It does not move work between machines or promise any date.Never: It does not reschedule production or promise a delivery date: planners decide what moves.

Always a person in manufacturing

  • A quality engineer decides whether a revised procedure may be used on the line.
  • A supervisor, not the platform, decides when a machine is safe to restart.
  • Counsel decides how the company answers a customer's claim.

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