{"id":436,"date":"2026-06-11T07:12:54","date_gmt":"2026-06-11T07:12:54","guid":{"rendered":"https:\/\/simutecra.com\/blog\/?p=436"},"modified":"2026-06-16T05:38:57","modified_gmt":"2026-06-16T05:38:57","slug":"version-control-engineering-drawing","status":"publish","type":"post","link":"https:\/\/simutecra.com\/blog\/version-control-engineering-drawing\/","title":{"rendered":"Version Control for Engineering Drawings | Revision Guide"},"content":{"rendered":"\n<p>Picture this: your manufacturing team is three weeks into production, cutting steel and assembling components, when someone discovers they have been working from the wrong revision of a critical assembly drawing. The updated hole pattern from Rev C never made it to the shop floor. They have been building from Rev A. The cost? Thousands of dollars in rework, delayed shipment, and a client relationship that takes months to repair.<\/p>\n\n\n\n<p>This scenario plays out in engineering firms, manufacturing plants, and design offices every week. It is not a technology failure. It is a version control failure.<\/p>\n\n\n\n<p>Managing revisions in <a href=\"https:\/\/simutecra.com\/blogs\/convert-hand-drawn-sketch-to-cad-drawing\/\" target=\"_blank\" data-type=\"link\" data-id=\"https:\/\/simutecra.com\/blogs\/convert-hand-drawn-sketch-to-cad-drawing\/\" rel=\"noreferrer noopener\">engineering drawings <\/a>is one of the most overlooked yet consequential disciplines in technical work. Unlike software code, where a bad commit can be rolled back in seconds, a machined part built from the wrong revision may be impossible to undo. The stakes are real and the margin for error is slim.<\/p>\n\n\n\n<p>This guide walks you through everything you need to know about version control for engineering drawings: what it means, how revision systems work, what tools are available, and what best practices separate teams that get it right from those that constantly fight drawing chaos.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"562\" src=\"https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-revision-timeline-1024x562.png\" alt=\"Engineering drawing revision history timeline showing incremental design changes from Rev A to Rev F\" class=\"wp-image-333\" srcset=\"https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-revision-timeline-1024x562.png 1024w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-revision-timeline-300x165.png 300w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-revision-timeline-768x421.png 768w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-revision-timeline-1536x843.png 1536w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-revision-timeline.png 1693w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. What Is Version Control for Engineering Drawings?<\/strong><\/h2>\n\n\n\n<p>Version control, in the <a href=\"https:\/\/simutecra.com\/blogs\/context-engineering-cad-system-future-prompting\" target=\"_blank\" rel=\"noreferrer noopener\">context of engineering drawings<\/a>, refers to the systematic process of tracking, managing, and preserving every change made to a technical drawing over its lifecycle. Each change is documented with a unique revision identifier, a description of what changed, who made the change, and when it was made.<\/p>\n\n\n\n<p>At its core, version control ensures that at any point in time, every person on a project is working from the correct, approved version of a drawing, and that the full history of previous revisions remains accessible for reference, audit, or analysis.<\/p>\n\n\n\n<p>This is fundamentally different from simply saving multiple copies of a file. True version control is structured, traceable, and governed by defined rules about how changes are approved and communicated.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Key Terms You Need to Know<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Revision: <\/strong>A formally approved change to a drawing, typically labeled alphabetically (Rev A, Rev B) or numerically depending on the organization&#8217;s standard.<\/li>\n\n\n\n<li><strong>Revision Block \/ Title Block: <\/strong>The section of a drawing, usually in the lower right corner, that records the revision history including revision letter, date, description, and authorization.<\/li>\n\n\n\n<li><strong>Release: <\/strong>The formal process of issuing a drawing for use in production or construction after it has been reviewed and approved.<\/li>\n\n\n\n<li><strong>ECO \/ ECR (Engineering Change Order \/ Request): <\/strong>A formal document that initiates, describes, and authorizes a change to an engineering drawing or design.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/simutecra.com\/blogs\/as-built-drawings-explained\/\" data-type=\"link\" data-id=\"https:\/\/simutecra.com\/blogs\/as-built-drawings-explained\/\">As-Built Drawing<\/a>: <\/strong>A drawing updated after construction or manufacturing to reflect the actual final state of the built item.<\/li>\n\n\n\n<li><strong>Controlled Copy: <\/strong>An official version of a drawing distributed through a managed process, ensuring it matches the current approved revision.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. Why Drawing Revision Management Matters<\/strong><\/h2>\n\n\n\n<p>If you have worked in manufacturing, construction, aerospace, or any engineering-heavy field, you already know that drawings are not static documents. They evolve. Materials change. Tolerances are refined. Assembly sequences get optimized. Customer requirements shift mid-project.<\/p>\n\n\n\n<p>What separates high-performing engineering organizations from those constantly in firefighting mode is not the absence of change. It is the ability to manage change systematically.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Business Cost of Poor Revision Control<\/strong><\/h3>\n\n\n\n<p>Poor drawing revision management creates a cascade of downstream problems:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Rework and scrap costs: <\/strong>Parts manufactured to an outdated drawing must be scrapped or expensively reworked. In precision machining, a single wrong revision can cost thousands of dollars in material and labor.<\/li>\n\n\n\n<li><strong>Project delays: <\/strong>When teams cannot quickly identify which drawing revision is current, time is wasted chasing clarification instead of executing work.<\/li>\n\n\n\n<li><strong>Safety risks: <\/strong>In structural, aerospace, and medical device engineering, using a superseded drawing can have life-safety consequences. This is why regulatory bodies like the FAA and ISO mandate formal revision control procedures.<\/li>\n\n\n\n<li><strong>Audit failures: <\/strong>Companies in regulated industries are required to demonstrate traceability of design changes. Without proper version control, passing a quality audit becomes nearly impossible.<\/li>\n\n\n\n<li><strong>Communication breakdown: <\/strong>When suppliers, subcontractors, and internal teams operate from different revisions, collaboration breaks down. Finger-pointing replaces problem-solving.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. How Engineering Drawing Revision Systems Work<\/strong><\/h2>\n\n\n\n<p>Most engineering organizations follow a structured revision numbering convention. While the specifics vary by company and industry, the underlying logic is consistent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Alphabetical vs. Numerical Revision Schemes<\/strong><\/h3>\n\n\n\n<p>The two most common approaches are alphabetical and numerical revision systems. Each has practical advantages depending on the type of project and the organization&#8217;s workflow.<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table><thead><tr><th><strong>Scheme<\/strong><\/th><th><strong>Format<\/strong><\/th><th><strong>Typical Use Case<\/strong><\/th><th><strong>Pros<\/strong><\/th><th><strong>Cons<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Alphabetical<\/td><td>Rev A, B, C&#8230;<\/td><td>General engineering, manufacturing<\/td><td>Simple, widely understood<\/td><td>Limited to 26 revisions; ambiguity with I, O<\/td><\/tr><tr><td>Numerical<\/td><td>Rev 1, 2, 3&#8230;<\/td><td>Software-influenced teams, PLM systems<\/td><td>Unlimited revisions, easy sorting<\/td><td>Less intuitive in traditional shops<\/td><\/tr><tr><td>Alpha-Numeric<\/td><td>Rev A1, A2, B1&#8230;<\/td><td>Complex, multi-phase projects<\/td><td>Tracks major\/minor changes<\/td><td>Can become confusing without clear rules<\/td><\/tr><tr><td>Date-Based<\/td><td>2024-03-15<\/td><td>Construction as-builts<\/td><td>Self-explanatory timestamps<\/td><td>Hard to determine sequence at a glance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Revision Block: The Heart of Drawing Version Control<\/strong><\/h3>\n\n\n\n<p>Every properly formatted engineering drawing includes a revision block, typically located in the title block area. This block is the official record of the drawing&#8217;s revision history and should include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Revision letter or number<\/li>\n\n\n\n<li>Date of revision<\/li>\n\n\n\n<li>Description of the change (brief but specific)<\/li>\n\n\n\n<li>Name or initials of the person who made the change<\/li>\n\n\n\n<li>Authorization or approval signature<\/li>\n<\/ul>\n\n\n\n<p>The revision block should be updated every time a formal change is made. Informal or undocumented changes (sometimes called &#8216;pencil changes&#8217; in traditional shops) are a major source of version control breakdown.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Role of the Engineering Change Order (ECO)<\/strong><\/h3>\n\n\n\n<p>For any organization handling <a href=\"https:\/\/simutecra.com\/blogs\/text-to-cad-ai-product-design\/\" target=\"_blank\" data-type=\"link\" data-id=\"https:\/\/simutecra.com\/blogs\/text-to-cad-ai-product-design\/\" rel=\"noreferrer noopener\">product design<\/a>, the ECO is the formal mechanism that bridges the gap between someone identifying a needed change and that change being officially incorporated into the drawing. A well-designed ECO process includes:<\/p>\n\n\n\n<ol start=\"12\" class=\"wp-block-list\">\n<li><strong>Change Request: <\/strong>Anyone on the team can submit a request identifying the problem or improvement needed.<\/li>\n\n\n\n<li><strong>Impact Assessment: <\/strong>Engineering reviews the request to understand how the change affects related drawings, parts, assemblies, and processes.<\/li>\n\n\n\n<li><strong>Approval Workflow: <\/strong>The change goes through an approval chain (engineering, quality, manufacturing, program management depending on impact).<\/li>\n\n\n\n<li><strong>Drawing Update: <\/strong>The drafter or engineer updates the drawing, increments the revision, and records the change in the revision block.<\/li>\n\n\n\n<li><strong>Release and Distribution: <\/strong>The new revision is formally released and distributed to all stakeholders, and old revisions are clearly marked as superseded.<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-change-order-process-flow-1024x683.png\" alt=\"Flowchart of an Engineering Change Order process showing steps from change request to drawing release and distribution\" class=\"wp-image-334\" srcset=\"https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-change-order-process-flow-1024x683.png 1024w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-change-order-process-flow-300x200.png 300w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-change-order-process-flow-768x512.png 768w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-change-order-process-flow.png 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. Manual vs. Digital vs. PLM-Based Version Control<\/strong><\/h2>\n\n\n\n<p>The method an organization uses to manage drawing revisions has a massive impact on efficiency, accuracy, and scalability. There is no single right answer. The best approach depends on team size, project complexity, and industry requirements. Let us walk through the three primary models.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Manual Revision Control (Paper and Shared Folders)<\/strong><\/h3>\n\n\n\n<p>Many small shops and independent contractors still manage drawings through physical files or shared network folders. This approach works at a small scale but introduces serious risk as teams grow.<\/p>\n\n\n\n<p>Common signs of a manual system include: print-and-mark revision tracking, emailed drawings with revision numbers in the filename, and a shared folder structure like &#8216;Engineering &gt; Drawings &gt; Current&#8217; with a separate &#8216;Archive&#8217; folder.<\/p>\n\n\n\n<p>The core problem with manual systems is that they rely entirely on human discipline. One person saving over the wrong file, or forgetting to move the old version to the archive, can create silent errors that do not surface until significant damage is done.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Digital Version Control (CAD Software and EDM Systems)<\/strong><\/h3>\n\n\n\n<p>Modern CAD platforms including SolidWorks PDM, Autodesk Vault, PTC Windchill, and CATIA come with built-in document management and revision control capabilities. These systems track file versions at the software level, making it much harder (though not impossible) to lose or overwrite revision history.<\/p>\n\n\n\n<p>Key features to look for in a digital drawing management system include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check-in and check-out functionality to prevent simultaneous editing<\/li>\n\n\n\n<li>Automatic version incrementing on save or release<\/li>\n\n\n\n<li>Audit trail showing who made changes and when<\/li>\n\n\n\n<li>Role-based access control (not everyone should be able to release drawings)<\/li>\n\n\n\n<li>Search and retrieval by revision number, date, or associated project<\/li>\n\n\n\n<li>Integration with CAD software to link drawing files directly to revision records<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>PLM-Based Version Control (Enterprise-Scale)<\/strong><\/h3>\n\n\n\n<p>Product Lifecycle Management (PLM) systems like Siemens Teamcenter, PTC Windchill, and Dassault Enovia represent the most comprehensive approach to engineering drawing revision control. PLM systems manage not just the drawings themselves, but the entire product data ecosystem: BOMs, change orders, supplier drawings, manufacturing processes, and quality records.<\/p>\n\n\n\n<p>For large manufacturers, aerospace companies, and automotive OEMs, PLM is often mandatory. These systems ensure that every drawing revision is linked to its originating change order, the associated BOM impact has been assessed, and all downstream teams receive automatic notification when a new revision is released.<\/p>\n\n\n\n<p>The tradeoff is cost and complexity. PLM implementations require significant investment in software licensing, IT infrastructure, and training. They are overkill for a 10-person fabrication shop but essential for a tier-1 aerospace supplier.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. Best Practices for Managing Drawing Revisions<\/strong><\/h2>\n\n\n\n<p>Whether your team uses paper folders or a full PLM system, the following practices consistently separate organizations with clean revision control from those drowning in drawing chaos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Establish a Revision Numbering Convention and Stick to It<\/strong><\/h3>\n\n\n\n<p>Pick a revision scheme and document it formally. Define what triggers a new revision (versus an informal markup), how revisions are labeled, and where the revision history lives. Share this standard with every person who touches drawings, including external suppliers and contractors.<\/p>\n\n\n\n<p>Consistency is more important than the specific scheme you choose. A team using alphabetical revisions impeccably will outperform one with a sophisticated system applied inconsistently.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Never Delete Old Revisions<\/strong><\/h3>\n\n\n\n<p>This one cannot be overstated. Superseded revisions must be retained, not deleted. Why? Because products already in service were built from those older revisions. If a field failure occurs, your maintenance team needs to know exactly what design was in place at the time of manufacture. If you have deleted Rev B because Rev C is current, you have lost critical traceability.<\/p>\n\n\n\n<p>In digital systems, superseded revisions should be moved to an &#8216;Obsolete&#8217; status, not deleted from the database. They should still be searchable and accessible to authorized personnel but clearly marked so no one accidentally uses them for production.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Use Meaningful Change Descriptions<\/strong><\/h3>\n\n\n\n<p>A revision block entry that says &#8216;Updated per ECO-1042&#8217; is useful only if someone can look up ECO-1042. An entry that says &#8216;Updated per ECO-1042: changed hole pattern on flange face from 4x M6 to 6x M8 per customer RFI-217&#8217; is genuinely informative to anyone reading the drawing years later without access to the ECO database.<\/p>\n\n\n\n<p>Train your team to write revision descriptions that stand alone. Future engineers, quality auditors, and production teams will thank you.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Control Distribution of Drawings<\/strong><\/h3>\n\n\n\n<p>The best revision control system in the world fails if people can bypass it. Establish a single source of truth for current drawings, whether that is your PDM system, your PLM, or a strictly managed shared drive with clear folder governance.<\/p>\n\n\n\n<p>When a new revision is released, formally notify all stakeholders and pull back or obsolete distributed copies of the previous revision. In digital environments, this means updating the file status. In physical environments, it means collecting and stamping old prints as &#8216;superseded.&#8217;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Separate Internal Working Revisions from Released Revisions<\/strong><\/h3>\n\n\n\n<p>Many teams use a preliminary revision scheme (often lowercase letters or draft numbers) for drawings that are in development but not yet formally released. This protects the integrity of the official revision record while still providing version tracking during the design phase.<\/p>\n\n\n\n<p>For example, a drawing might go through internal iterations a, b, c as the design evolves, then be formally released as Rev A when it is ready for production. This way, the official revision record stays clean and only reflects formally approved states.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"312\" src=\"https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-title-block-template-e1779440909918-1024x312.png\" alt=\"Engineering drawing title block showing revision history from Rev A to Rev D with change descriptions, dates, and initials\" class=\"wp-image-335\" srcset=\"https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-title-block-template-e1779440909918-1024x312.png 1024w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-title-block-template-e1779440909918-300x91.png 300w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-title-block-template-e1779440909918-768x234.png 768w, https:\/\/simutecra.com\/blog\/wp-content\/uploads\/2026\/05\/Engineering-drawing-title-block-template-e1779440909918.png 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Implement a Formal Drawing Review and Release Workflow<\/strong><\/h3>\n\n\n\n<p>Drawings should not be released directly by the person who created them. A formal review step, even a lightweight one for small teams, catches errors before they propagate into production. At minimum, define who can review drawings, who can approve them, and who can release them. These can be the same person in a small shop but the process should still be intentional.<\/p>\n\n\n\n<p>For higher-stakes drawings (safety-critical parts, customer-deliverable documents, regulatory submissions), require multi-discipline review including manufacturing, quality, and sometimes the customer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. Common Revision Control Mistakes (and How to Avoid Them)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Using File Names as the Version Control System<\/strong><\/h3>\n\n\n\n<p>File names like &#8216;bracket_assembly_FINAL_v3_REVISED_USE-THIS-ONE.dwg&#8217; are a warning sign. When the file name is your only version indicator, you are one accidental save away from losing your revision history. Use a proper revision tracking system and keep file names simple and consistent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Maintaining Multiple &#8216;Current&#8217; Folders<\/strong><\/h3>\n\n\n\n<p>Teams under pressure sometimes create parallel folder structures (&#8216;Current,&#8217; &#8216;Current-2024,&#8217; &#8216;Latest from Supplier&#8217;) that each claim to hold the authoritative version. This leads directly to the scenario described in the introduction. Enforce a single source of truth.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Skipping the Revision Block Update<\/strong><\/h3>\n\n\n\n<p>When a drawing is updated quickly or informally, it is tempting to skip updating the revision block. This creates a drawing that has changed physically but whose metadata says otherwise. Make revision block updates a non-negotiable step in the drawing change process, not an optional one.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Not Linking Drawings to Change Orders<\/strong><\/h3>\n\n\n\n<p>A revision with no associated change order is a revision with no traceable rationale. Future engineers, auditors, and customers cannot understand why a change was made if it was never documented. Even for minor updates, a simple ECR takes five minutes and creates invaluable traceability.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. Tools and Software for Engineering Drawing Version Control<\/strong><\/h2>\n\n\n\n<p>Choosing the right tool depends heavily on your workflow, team size, and industry. Here is a practical overview of what is available across the spectrum.<\/p>\n\n\n\n<figure class=\"wp-block-table has-medium-font-size\"><table><thead><tr><th><strong>Tool \/ System<\/strong><\/th><th><strong>Type<\/strong><\/th><th><strong>Best For<\/strong><\/th><th><strong>Key Feature<\/strong><\/th><\/tr><\/thead><tbody><tr><td>SolidWorks PDM Standard<\/td><td>CAD-Integrated EDM<\/td><td>Small to mid-size teams using SolidWorks<\/td><td>Check-in\/out, vault storage, revision workflow<\/td><\/tr><tr><td>Autodesk Vault<\/td><td>CAD-Integrated EDM<\/td><td>Autodesk Inventor \/ AutoCAD users<\/td><td>Tight CAD integration, lifecycle management<\/td><\/tr><tr><td>PTC Windchill<\/td><td>Full PLM<\/td><td>Mid to large manufacturers, OEMs<\/td><td>BOM management, multi-site collaboration<\/td><\/tr><tr><td>Siemens Teamcenter<\/td><td>Full PLM<\/td><td>Aerospace, automotive, defense<\/td><td>Digital twin integration, regulatory compliance<\/td><\/tr><tr><td>Onshape<\/td><td>Cloud CAD + PDM<\/td><td>Distributed teams, cloud-first orgs<\/td><td>Built-in branching, real-time collaboration<\/td><\/tr><tr><td>SharePoint + Custom Workflow<\/td><td>Document Management<\/td><td>Organizations already using Microsoft 365<\/td><td>Low cost, familiar interface<\/td><\/tr><tr><td>Git \/ Git LFS<\/td><td>Software-style VCS<\/td><td>Teams with CAD text formats (e.g. OpenSCAD)<\/td><td>Branching, diffing, open source<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>A Note on Git for Engineering Drawings<\/strong><\/h3>\n\n\n\n<p>Software developers use Git as their version control backbone, and some engineering teams have explored applying Git to CAD files. This works reasonably well for text-based CAD formats (OpenSCAD, FreeCAD, KiCad) where actual file differences can be compared line by line. For binary <a href=\"https:\/\/simutecra.com\/blogs\/cad-file-formats-dwg-dxf-step-iges\/\" data-type=\"link\" data-id=\"https:\/\/simutecra.com\/blogs\/cad-file-formats-dwg-dxf-step-iges\/\">formats like CATIA or SolidWorks native files<\/a>, Git stores the entire file on each commit rather than the difference, which becomes storage-intensive. Git LFS (Large File Storage) partially addresses this. For most traditional engineering workflows, a purpose-built PDM or PLM system will be more practical than Git.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>8. Version Control in Regulated and Aerospace Industries<\/strong><\/h2>\n\n\n\n<p>In regulated industries, drawing revision control is not a best practice. It is a legal and contractual requirement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>ISO 7200 and Drawing Title Block Standards<\/strong><\/h3>\n\n\n\n<p><a href=\"http:\/\/iso.org\" data-type=\"link\" data-id=\"iso.org\" target=\"_blank\" rel=\"noopener\">ISO 7200<\/a> defines the required fields for technical drawing title blocks used in ISO-compliant organizations. It specifies fields for legal owner, document status, revision identifier, dates, approvals, and related document references. Organizations seeking ISO certification are expected to maintain drawings that conform to this standard or an equivalent organizational standard derived from it.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>AS9100 and Aerospace Drawing Control<\/strong><\/h3>\n\n\n\n<p>The AS9100 quality management standard, used throughout the aerospace and defense supply chain, mandates rigorous control of technical documentation including engineering drawings. AS9100 requires that organizations control documents to ensure only the correct revision is available at points of use, changes are reviewed and approved by authorized personnel, the identity of the current document status is clear, and records of obsolete documents are maintained.<\/p>\n\n\n\n<p>Failure to demonstrate compliant drawing revision control can result in failed audits, lost contracts, and in the case of safety-critical parts, regulatory action.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>FDA and Medical Device Drawing Requirements<\/strong><\/h3>\n\n\n\n<p>Medical device manufacturers operating under FDA 21 CFR Part 820 (Quality System Regulation) and the ISO 13485 standard face similar requirements. Device History Records (DHR) must be traceable to <a href=\"https:\/\/simutecra.com\/blogs\/cad-drawing-specification-outsourcing-partner\/\" target=\"_blank\" rel=\"noreferrer noopener\">specific drawing<\/a> revisions. If a device is manufactured to a revision that differs from what was validated, it constitutes a serious regulatory non-conformance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>FAQ: <\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is the difference between a revision and a version in engineering drawings?<\/strong><\/h3>\n\n\n\n<p>In engineering practice, a &#8216;revision&#8217; typically refers to a formally approved and released change to a drawing, documented in the revision block. A &#8216;version&#8217; is a more informal term and may refer to any iteration of a file, including working drafts not yet formally released. Some organizations use these terms interchangeably, but best practice is to reserve &#8216;revision&#8217; for formally controlled changes only.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How do you handle drawing revisions when working with external suppliers?<\/strong><\/h3>\n\n\n\n<p>When sharing drawings with external suppliers, always include the revision number prominently on the drawing and in any accompanying purchase order or work order documentation. Establish a formal process for notifying suppliers when a new revision is released, and confirm that they have received and acknowledged the update before production begins. Include drawing revision numbers in acceptance criteria and inspection records.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Should you use letters or numbers for engineering drawing revisions?<\/strong><\/h3>\n\n\n\n<p>Either works, and the choice depends largely on organizational convention and industry norms. Alphabetical revisions (A, B, C) are traditional in manufacturing and aerospace. Numerical revisions (1, 2, 3) are common in software-influenced organizations and some PLM systems. What matters most is consistency: pick a scheme, document it, and apply it uniformly across all drawings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What should be included in a drawing revision description?<\/strong><\/h3>\n\n\n\n<p>A good revision description should be specific enough to be understood without referencing other documents. Include what changed (the specific geometry, dimension, note, or specification), why it changed (customer requirement, design improvement, manufacturing feedback), and the reference number of any associated change order. Aim for one to three sentences of clear, factual description.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How long should you retain obsolete drawing revisions?<\/strong><\/h3>\n\n\n\n<p>Retention requirements vary by industry and contractual obligation. As a general rule, retain all superseded revisions for the full service life of the product plus the applicable statutory limitation period. In aerospace and defense, this often means 20 to 30 years or longer. In regulated industries, consult applicable standards (AS9100, ISO 13485, FDA QSR) and your legal counsel for specific requirements.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Can you use cloud storage like Google Drive or Dropbox for engineering drawing version control?<\/strong><\/h3>\n\n\n\n<p>Cloud storage platforms can provide basic version history for files, but they are not purpose-built for engineering drawing revision control. They lack features like formal release workflows, revision block integration, role-based approval authority, and audit trails required by quality standards. They can serve as a step up from unmanaged shared drives for small teams, but growing organizations should invest in a proper PDM or EDM system.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion: <\/strong><\/h2>\n\n\n\n<p>Version control for engineering drawings is ultimately about trust. When your manufacturing team picks up a drawing, they need to trust that it is the correct revision. When your quality auditor traces a field failure back to its source, they need to trust that the revision history is complete. When your customer asks for the design documentation package, they need to trust that what they receive reflects exactly what was built.<\/p>\n\n\n\n<p>No software system, however sophisticated, creates that trust on its own. It is built through disciplined processes, clear standards, and a team culture that treats drawing revision control not as administrative overhead but as a core engineering responsibility.<\/p>\n\n\n\n<p>Start where you are. If your organization is still managing revisions through file names and shared folders, move to a structured naming convention and a formal release process first. If you have a basic PDM system, audit how consistently it is being used and tighten the workflows. If you are at the PDM stage and scaling fast, evaluate whether a PLM investment is justified.<\/p>\n\n\n\n<p>The cost of getting revision control right is modest. The cost of getting it wrong, measured in rework, audit failures, and damaged customer relationships, is substantial.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Picture this: your manufacturing team is three weeks into production, cutting steel and assembling components, when someone discovers they have been working from the wrong revision of a critical assembly drawing. The updated hole pattern from Rev C never made it to the shop floor. They have been building from Rev A. The cost? Thousands [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":333,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[39,83,67,22,17,24,82],"class_list":["post-436","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-3d-modeling","tag-eco","tag-engineering","tag-engineering-design","tag-engineering-drafting","tag-mechanical-engineering","tag-version-control-for-engineering-drawing"],"_links":{"self":[{"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/posts\/436","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/comments?post=436"}],"version-history":[{"count":2,"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/posts\/436\/revisions"}],"predecessor-version":[{"id":485,"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/posts\/436\/revisions\/485"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/media\/333"}],"wp:attachment":[{"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/media?parent=436"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/categories?post=436"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/simutecra.com\/blog\/wp-json\/wp\/v2\/tags?post=436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}