Tens of Thousands of Drawings, Found Only by Part Number and Memory
Engineering teams at manufacturers often sit on tens of thousands of drawings. Yet when a new part is needed, the way people look for an existing one usually comes down to file names, part numbers, and what a senior designer happens to remember. If the numbering scheme has changed or that designer has left, someone ends up redrawing a bracket that is nearly identical to one already on file.
Duplicate design costs far more than one extra drawing:
Suppose registering one new part number takes a few dozen hours across design, validation, purchasing, and quality. A hundred part numbers a year that could have been existing parts then add up to thousands of hours. Reusing proven parts, on the other hand, lets you skip prototype and approval steps and shortens development lead time.
How Similar Drawing Search Works
Combining Three Signals
Hybrid Search
A part that looks similar isn't necessarily one you can use. What works in practice is to retrieve candidates by shape similarity, then narrow them with attribute filters such as material (SUS304, AL6061, and so on), overall dimension ranges, and finish. A designer uploads a sketch or an existing drawing and adds conditions like "same material, length within ±10%."
Data Preparation Decides the Outcome
Real drawing repositories mix scanned paper, print-ready PDFs, and native CAD files like DWG and STEP. The first job is normalization: fixing resolution and orientation, separating the title block and border, and linking the different formats of the same part.
It Only Gets Used When Connected to PLM and ERP
If search results show only a picture, designers still have to dig through ERP afterward. Each result card should show part number, latest unit price, supplier, usage over the past year, and where-used products, so the "let's reuse this" decision can happen on the spot.
Even better is to build it into the workflow. Attach similar-part results automatically to every new part number request, and when a close match exists, require a reason for not using it. That turns search from a matter of individual goodwill into a checkpoint in the approval process.
Security and Access Control
Drawings are core technical assets, and customer drawings are often covered by NDAs. Sending originals to an external cloud API may be ruled out by contract, so on-premises deployment of the embedding model and vector database should be the first option evaluated.
To keep the search system from becoming a leak path, access rights by customer and project must mirror the PLM permission model. Parts exclusive to Customer A shouldn't appear in search results for a designer working on Customer B's project, and views and downloads should be logged.
Pilot Scope and POLYGLOTSOFT's Approach
Rather than tackling every drawing at once, start with one part family in one product line, such as sheet-metal brackets or shafts. Useful metrics include:
POLYGLOTSOFT helps build similar drawing search on top of your existing drawing repository, PLM, and ERP without replacing them. We work with you step by step, from drawing normalization and title block cleanup to hybrid search, integration with new part registration, on-premises deployment, and permission design. If repeated duplicate design is costing you time and money, let's start by scoping a pilot together.