Batch Drawings for Similar Parts
Import hundreds of similar parts, review a few representative drawings, and generate editable, standards-compliant drawings for the full batch.
When mechanical designers need drawings for a batch of similar parts, the slowest work is often not drawing any one sheet. It is repeatedly deciding the primary view, section views, and dimension layout. Users drag an entire batch of 3D parts into a project, then upload an approved legacy drawing as an example of their company’s line styles, title block, and annotation conventions.
The product first groups parts into families based on geometric features such as hole locations, outer profiles, wall thickness, and assembly faces. It generates just one representative drawing for each family. On that drawing, the designer confirms the primary view, section locations, critical dimensions, and tolerance notation. The approved rules are then applied to other parts in the family, without forcing every part into an identical drawing.
After batch generation, the project page separates directly editable drawings, missing tolerances, and exception parts. If a part has an extra hole or cannot use the same section view, the system identifies the specific difference from its representative part and asks the designer to address only that issue. Outputs can include version numbers for purchasing or the shop floor to verify.
The first release focuses on individual machining drawings and recurring part families, initially covering common dimension and section-view annotations. Exploded assembly drawings and highly specialized corporate drafting rules can follow through later template extensions.
Why now
On July 30, a developer demonstrated a tool that automatically generates drawings for hundreds of models; the post has received 69 likes, 4 reposts, and 1,851 views. S1 The demonstration makes the time spent laying out views in batches and repeatedly adjusting layouts a concrete engineering-automation problem.
Target user
The core user is the person responsible for drawing output on a mechanical design team. A typical moment comes just after a project completes models for a batch of similar parts, while purchasing or the shop floor is waiting for released 2D drawings. Laying out views and dimensions one drawing at a time delays the entire release. The team already has approved templates but lacks a way to determine what can be reused across parts. The lead is willing to review a few representative parts, but cannot accept tolerances without human review.
Minimal entry point
Build the first version as an Inventor plug-in for prismatic machined parts. Use B-Rep data to extract bounding-box ratios, hole patterns, and major planes, then group parts through interpretable feature distances. Generate base, projected, and section views with DrawingViews; add and arrange dimensions through DrawingDimensions. S3 Initially accept only editable IDW or DWG legacy drawings as templates. Inherit the title block, line styles, and dimension styles directly from the template. Once a representative part is approved, save only its view orientation, sectioning, and dimension-reference rules. Send unmatched features to an exception queue rather than adding tolerances automatically. Exclude assembly drawings, freeform-surface parts, and learning from arbitrary PDFs for now.
Punching above its weight
Find initial users among mechanical design teams that already have batch drawing work. Demonstrate the reduction in review count before and after grouping with a public set of STEP parts, emphasizing how added holes enter the exception queue. Then invite teams to provide de-identified part packages for short trials. Each trial should deliver editable drawings and a difference list. Discussions of automation scripts in mechanical-design forums are also suitable for plugin videos. Show real revision workflows rather than only before-and-after generation comparisons.
Competitors & gaps
- Autodesk Fusion Drawing AutomationGoogle
- Fusion can automatically create drawings from designs and place views using templates. It also offers several automated dimensioning strategies and dimension-arrangement capabilities, while engineers can review and modify the output. S2 This already covers most basic drawing-generation tasks for an individual design. Its public documentation still centers on templates and settings for individual drawings. There is no apparent workflow for organizing an entire batch of parts by geometric similarity, reviewing one representative drawing per family, and propagating its rules. Nor are geometric differences between exception parts and their representative part presented separately. The opportunity is therefore not simply to generate a single drawing faster, but to focus on batch grouping, rule reuse, and exception review.
- DraftAidGoogle
- DraftAid generates 2D manufacturing drawings from 3D models. It can learn from a company’s existing drawings and apply their layout and annotation standards; its official materials also list machined parts, sheet metal, and structural profiles. S4 This overlaps directly with the proposed product. It already addresses template adaptation and initial drawing generation. Public descriptions appear more focused on automated drawings for individual models. There is no apparent review interface that first clusters an entire batch of parts into families, or an explanation of how rules from a representative part are propagated to its family. The opportunity is to reduce how many drawings an engineer must confirm one by one, while turning differences such as extra holes into explicit review tasks. If the grouping experience is not reliable enough, that opening will close quickly.
- Inventor API and in-house drawing scriptsGoogle
- Companies often use the Inventor API or in-house scripts to generate drawings in batches. The official API can create base, projected, and section views, access drawing dimensions, and automatically arrange their positions. S3 For companies with stable part rules, this is a direct path that keeps templates, naming, and export workflows inside their existing CAD environment. But scripts generally depend on predefined part rules. New holes, new profiles, or version changes add maintenance work, and engineers still need to decide which parts can share a rule set. In-house scripts also rarely provide representative-part review or a difference queue. The product’s value is making the grouping decision a product capability, while proving that its maintenance cost is lower than continuing to extend existing scripts.
How it makes money
Charge a monthly subscription per engineer seat, with a fixed number of parts included. Charge by part bundle above the allowance; quote enterprise template adaptation and private deployment separately.
The case against
Incorrect grouping could propagate one drafting rule across many drawings. Missing an extra hole or datum face could directly affect machining and inspection, so the system must preserve traceable links between models and annotations. Legacy drawings also contain implicit conventions that layout alone cannot recover as design intent. Tolerances, datums, and surface finishes are especially dependent on assembly relationships. Supporting different CAD versions adds ongoing maintenance costs. If every drawing still requires individual review, the time saved will be limited. A single erroneous alert could also cause the team to lose trust.