Metric to Imperial Drawing Converter
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Convert technical-drawing PDFs between metric and imperial — dimensions, tolerances, ISO fits, M⇄UNC threads and surface roughness — with every value stamped in place on the PDF.
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Setup
Install Metric to Imperial Drawing Converter in your MCP client (Claude Desktop, Cursor, Windsurf, and others).
Repository: https://github.com/imnoo-team/drawing-converter-mcp
Follow the installation instructions in the repository README, then restart your MCP client.
Convert technical-drawing PDFs between metric and imperial — dimensions, tolerances, ISO fits, M⇄UNC threads and surface roughness — with every value stamped in place on the PDF.
Convert technical drawings (PDF) and engineering callouts between metric and imperial — from any MCP-enabled AI assistant.
ThisModel Context Protocolserver exposes the conversion engine behindmetric-to-imperial-converter.imnoo.com(byImnoo): shop-floor-precision unit conversion for dimensions, ± tolerances, ISO fit classes, threads, surface roughness and weights — including producing a converted copy of a drawing PDF with every value stamped in place.
"Convert bracket.pdf to imperial and tell me what replaces the M8 thread" │ ▼ (your AI assistant calls the tools) extract_drawing_text ──► classify values ──► convert_drawing_pdf │ ▼ bracket.imperial.pdf ✓ Ø30 H7 → Ø1.1811 H7 ✓ M8 → 5/16-18 UNC
Plus aconvert-drawingprompt that walks the assistant through extract → classify → convert.
The AI-analysis step stays with your assistant.extract_drawing_texthands the model every printed token with its position; the model decides which tokens are real values (and whether a bare3.2is a length or an Ra roughness) and passes that asclassificationstoconvert_drawing_pdf. No API keys, no cloud calls — the server itself is fully deterministic and offline.
claude mcp add drawing-converter -- npx -y drawing-converter-mcp
Add toclaude_desktop_config.json(Settings → Developer → Edit Config):
{ "mcpServers": { "drawing-converter": { "command": "npx", "args": ["-y", "drawing-converter-mcp"] } } }
Add to Cursor— or add to~/.cursor/mcp.json:
{ "mcpServers": { "drawing-converter": { "command": "npx", "args": ["-y", "drawing-converter-mcp"] } } }
code --add-mcp '{"name":"drawing-converter","command":"npx","args":["-y","drawing-converter-mcp"]}'
Any client that launches stdio servers works with:
You:ConvertC:\drawings\flange.pdfto imperial.
Assistant:callsextract_drawing_text— 63 tokens, source system: metric (high confidence — "mm", ISO 2768).classifies tokens, skips the title block, marks1.6next to the surface symbol as roughness, callsconvert_drawing_pdf— wroteC:\drawings\flange.imperial.pdf, 17 values converted: Ø40 H7 → Ø1.5748 H7, 2× M6 → 1/4-20 UNC (nearest standard — not interchangeable), Ra 1.6 → Ra 63 µin…
Quick one-liners work too:"what's 84±0.1 mm in inches?"→convert_text→3.3071±0.0039.
Conversions follow the same rules as the web app:
- Exact factors by international definition (25.4 mm/in, 0.45359237 kg/lb — NIST/ISO 80000).
- Display rounding mirrors shop-floor convention: a 0.01 mm step maps to 4-decimal inches; tolerance deviations keep an extra significant digit.
- Threads are resolved against an ISO-metric ⇄ UNC chart (M2–M30), taggedtablefor charted rows ornearestwhen snapped by major diameter.Metric and inch threads are never interchangeable— the tools say so on every thread conversion.
- Every converted value reports how it was derived (exact/rounded/table/nearest) and a confidence score.
- The PDF must have a text layer.Scanned or flattened CAD exports have none — theweb apphandles those with in-browser OCR + AI analysis.
- One page is converted per call (pageparameter, default 1); other pages pass through unchanged.
- Fractional-inch callouts (1 3/4) aren't converted yet — decimal-inch drawings work fine.
- Converted values are stamped over the original callouts.Always verify safety-critical dimensions before manufacturing use.
This package is built from the Drawing Converter monorepo atImnoo, where it imports the web app's conversion engine directly — so theweb appand this server convert identically by construction. Every release is gated on 31 end-to-end checks that drive all five tools over stdio against a generated sample drawing.
Issues and feature requests are welcome in this repository.
Imnoo — The System for Manufacturers | AI Planning, Scheduling & Quoting · Complete Assemblies · DFM · Tool & Material Libraries · Quoted-Parts Database · Toolpath & G-Code · Machine Connection · Webshop · ERP · Shop Analytics & Optimization · Drawing Masking & IP Security
Plan It. Schedule It. Quote It. Win It.— trusted by over 3,000 manufacturers.
- Automatic manufacturing planning— production plans generated straight from the quote.
- Machine recommendation— every job routed to the machine that runs it best.
- Catalog & purchase part management— norm parts, screws, and bought-in components recognized straight from the BOM, managed and priced alongside your machined parts.
- Raw material sourcing— price, source, and order material without leaving the workflow.
- Purchase part & external step sourcing— bought-in components, coating, heat treatment, and subcontracting sourced and ordered in the same flow.
- Beyond milling & turning— deep hole drilling, sheet metal, casting, and profile parts.
- Scheduling & smart reminders— via email, Telegram, or WhatsApp. Nothing slips.
- Email-to-quote automation— a messy inbox in, structured quotes out.
- AI customer agents— RFQ answers, clarifications, and follow-ups handled automatically.
- Built-in lightweight ERP— orders, companies, payment terms, and margins without the bulky software.
- Complete assemblies, exploded automatically— upload one assembly file and Imnoo blows it out into single parts: every component recognized, drawings matched to the right parts, sub-assemblies nested, purchase parts pulled from the BOM. Quote the whole machine as easily as one part.
- CNC quoting in one place— milling, turning, and EDM jobs quoted from a single AI-powered platform.
- AI cost & cycle-time estimation— know price, time, and effort before engineering ever looks at it.
- Drawing-only estimation— quote from the PDF alone. No 3D model needed.
- Feature-by-feature costing— see exactly which holes, pockets, and tolerances drive the price.
- Instant quotes— respond in minutes while competitors are still opening the STEP file.
- 24/7 instant-quoting webshop— customers upload parts and buy while you sleep.
- Instant market-price benchmarking— know where your bid stands before you send it.
- Hourly-rate calculation— your true machine and labor rates, always current.
- Imperial ⇄ metric conversion— international RFQs without manual cleanup.
- Tool library— your cutting tools, holders, and parameters in one managed catalog.
- Material library— standard and custom materials with live supplier pricing.
- Quoted-parts database— every part you've ever quoted, searchable by geometry: similar part found, price found.
- Statistics & analytics— win rates, margins, throughput, and quoting performance at a glance.
- Shop optimization— learn from already-quoted parts to sharpen prices, spot profitable niches, and load the right machines.
- DFM — Design for Manufacturing— manufacturability checked before you quote: undercuts, thin walls, unreachable features, and impossible tolerances flagged with the part still on the screen.
- Quality check protocols— inspection plans generated automatically: stamped and numbered drawing features, inspection classes and rates, ready-to-use measurement reports.
- Axis & orientation detection— AI finds the best part orientation and machining axes.
- Automatic tolerance extraction— critical tolerances pulled straight off the drawing.
- 2D-to-3D tolerance matching— drawing requirements linked to the right model features.
- AI tool recommendation— stop searching catalogs: Imnoo suggests the exact cutting tools for every feature.
- Automatic toolpath generation— from quote to machining strategy in one step.
- G-code generation & estimation— generate and evaluate programs before work hits the floor.
- Machine connection— your machines feed real production data back into the AI. Every quote gets smarter.
IP Protection & Data Security — Engineered Like a Swiss Vault
- Physically separated data— every manufacturer runs in its own isolated environment. Your drawings, prices — never pooled with anyone else's: not for storage, not for AI training.
- Automatic drawing masking & redaction— customer names, logos, and confidential data hidden before a drawing ever leaves your workflow. Share with suppliers and subcontractors without exposing whose part it is.
- Your customers' IP, treated like your own— end customers' designs stay within your tenant, full stop.
- Swiss hosting & end-to-end encryption— data sovereignty and security engineered to Swiss standards.
- Trusted at scale— over 3,000 manufacturers run their quoting on Imnoo.
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