Additive Manufacturing Work Instructions: How to Keep the Shop Floor on the Right Revision
TL;DR
Additive manufacturing work instructions should be linked to the specific job, process step and approved revision they govern.
To keep the shop floor on the correct revision, manufacturers need a controlled source for instructions, clear links between instructions and production work, a way to prevent obsolete versions remaining in use, and a record of which instruction was actually followed.
The objective is not simply to make work instructions digital. It is to make sure the correct instruction reaches the correct operator for the work being carried out.
Engineering releases Revision C of a part. The build file is updated and production receives the correct design.
Then an operator follows a work instruction written for Revision B.
Nothing may be wrong with the instruction itself. It is simply no longer the right instruction for that job.
This is why revision control in additive manufacturing cannot stop with CAD files and build data. The instructions used to manufacture, inspect and finish the part also need to remain connected to the correct production context.
What Is an Additive Manufacturing Work Instruction?
A work instruction explains how a specific manufacturing task should be carried out.
ISO 9000 describes work instructions as detailed descriptions of how to perform tasks. Depending on the process, they may include written guidance, checklists, images, technical notes, equipment instructions or other documented information.
In additive manufacturing, work instructions may cover:
machine preparation;
material handling;
part removal and depowdering;
heat treatment or machining;
inspection and testing;
packaging or release.
They are not the same as design data.
The design defines what should be manufactured. The work instruction explains how a particular activity should be performed. The production record then shows what actually happened.
Those three need to remain connected.
Why Work Instructions Become a Revision-Control Problem
AM production often involves several stages, people and systems.
A part may pass through printing, support removal, heat treatment, machining, inspection and testing. Some of those steps may take place at another site or with an external supplier.
At the same time, engineering information can change.
A geometry revision may affect support removal. A process change may alter heat treatment. A customer requirement may introduce another inspection.
The result is two separate questions:
Is production using the correct product definition?
And:
Are operators following the instructions that apply to it?
Controlling the first does not guarantee the second.
PLM may contain the correct engineering revision while an operator still uses an old PDF. The current instruction may be available in a shared folder while a printed copy remains beside the machine.
Revision control therefore needs to reach the point where manufacturing work is performed.
The Latest Instruction Is Not Always the Right Instruction
It is tempting to solve this by always showing operators the newest document.
That can also be wrong.
Imagine a part that entered production under an approved configuration. Engineering then releases a newer revision intended for future production.
Depending on the organisation's change-control process, the active job may remain against its existing approved baseline until the effect of the new revision has been reviewed.
The important question is therefore not, What is the latest instruction?
It is, Which approved instruction applies to this job and process step?
That distinction matters because a well-controlled document is only useful if it is connected to the work it actually governs.
Where Version Drift Happens
Work instruction problems often appear through ordinary workarounds rather than obvious process failures.
Operators may save PDFs locally, keep printed checklists beside machines or reuse instructions from similar jobs. Suppliers may receive documentation at the start of a job but miss a later update.
Each workaround creates another place where shop-floor information can drift away from the controlled production record.
The risk increases as operations expand across more machines, shifts, suppliers and sites.
How to Keep the Shop Floor on the Correct Revision
A few principles do most of the work.
Maintain a controlled source
Operators need to know where approved instructions come from.
That does not mean every engineering and manufacturing document must live in one system, but there should be no ambiguity about which instruction is authorised for production.
Connect instructions to the work
Instructions should be associated with the workflow, process step, part, workstation or activity they apply to.
Authentise Flows, for example, allows production workflows to contain individual manufacturing steps and associated work instructions.
The broader principle is simple: operators should not need to search through folders and decide which document probably belongs to the job.
Prevent obsolete versions remaining in active use
Publishing a revised instruction does not automatically remove every older copy.
Printed paperwork and locally saved files are particularly difficult to control once they leave the main system.
Where possible, operators should access the applicable instruction through the active production job rather than keeping their own copies.
Make instructions easy to access
Controlled information is only useful if operators can reach it when they need it.
For example, Authentise's QR workflow allows an operator to scan a traveller and access the current production run together with applicable work instructions.
That reduces the need to search manually or interpret filenames before starting work.
Record what was actually followed
Where traceability requires it, the production history should also make it possible to establish which instruction applied when the work was performed.
Depending on the process, the record may also include operator input, inspection results, measurements, images or comments.
This is particularly useful later when quality teams need to reconstruct how a part was manufactured.
What If the Instruction Changes During Production?
Once manufacturing has started, changing an instruction becomes more than a document-control problem.
If some parts have already completed the affected step while others have not, the manufacturer needs to understand:
which pieces are affected;
whether completed work remains acceptable;
whether production should stop;
who approves the change.
Simply replacing the instruction does not answer those questions.
That is why instruction revision control and production change management should remain separate processes.
Work Instructions Should Support the Production Record
Work instructions should not create another layer of administration.
Where possible, the information generated while completing the instruction should become part of the manufacturing history.
If an operator completes a task, records an inspection result or attaches supporting evidence, capturing that information during production is far more useful than asking quality teams to rebuild the history later from emails, filenames and spreadsheets.
Where Digital Workflow Software Helps
The value of digital work instructions is not simply replacing paper with a screen.
The greater benefit comes from connecting the instruction directly to the production workflow.
A workflow system can maintain the relationship between the active job, the relevant process step, the applicable instruction and the information captured during execution.
Authentise Flows uses production workflows to connect manufacturing steps with work instructions while allowing operators to feed production information back into the manufacturing record.
It does not replace PLM, quality systems or engineering change control. It helps keep controlled manufacturing information connected to execution.
The Goal Is Controlled Execution
A PDF can be digital and still be wrong.
The important thing is not the format of the instruction, but whether the instruction is approved for the work currently being performed.
Good work instruction control means the operator can access the correct instruction without searching, guessing or comparing filenames, while the organisation retains a record of what applied during production.
Controlling the engineering revision is therefore only part of the job. The relevant manufacturing instructions also need to remain controlled through shop-floor execution.
Explore Authentise Flows to see how connected work instructions can support controlled additive manufacturing execution.
