Reverse Engineering
A physical part, 3D scan or photo becomes accurate, fully editable CAD — dimensions recovered, design intent rebuilt, files you own outright.
Hi, I'm Engr. Muhammad Shahryar Khan
From sketch, photo or part to manufacturing-ready CAD.
PEC-registered mechanical design engineer, working solo with clients worldwide. Send a hand sketch, a photo, a worn part or a rough PDF — get back production 3D models and fully dimensioned GD&T drawings, typically in 48 hours.
- 48hTypical turnaround
- 100%Upwork Job Success
- PECRegistered engineer
- 5.0★Client reviews
SolidWorks NativeSTEP / IGESDWG / DXFPDF DrawingsGD&T · ASME Y14.5Flat-Pattern DXFBOM Included
01 — Services
CAD & reverse engineering services, built for the shop floor.
Not general drafting. A focused pipeline that takes whatever you have to files your machinist, molder or fabricator can use on day one.
Sketch & PDF to CAD
Hand sketches, legacy drawings and rough PDFs rebuilt as clean, parametric production models.
2D Production Drawings + GD&T
Fully dimensioned drawings with datums, feature control frames, tolerances, sections and BOM — ready for quoting, CNC and QA sign-off.
3D Modeling & Assemblies
Parts, mechanisms and consumer products — mated, motion-checked and export-ready in native or STEP.
DFM Review
Every part checked for machining or molding reality, so it's built right the first time — not just pretty on screen.
Parametric & CAD Automation
Python-driven parametric models that regenerate whole families of parts from a handful of inputs.
02 — Portfolio
Real SolidWorks assemblies, drawn for manufacture.
Eight pieces from the portfolio — modelled, mated and drawing-ready. Hover any card to watch it come apart; open it for the full exploded view and every angle.
P·01
Planetary Gearbox — 3:1 Epicyclic Reduction
Problem — A 3:1 reduction was needed in a compact, coaxial envelope where a standard gear train wouldn't fit.
Solution — A fully-mated star epicyclic train with true involute tooth profiles; sun, planets, ring and carrier regenerate from module, tooth count and pressure angle.
P·02
Rigid Flange Coupling — Assembly + Drawing Set
Problem — Two shafts needed a rigid, torque-transmitting connection with drawings a shop could quote and cut from directly.
Solution — A 10-component assembly with hex-bolt fasteners, fully mated, plus a complete production drawing set with BOM and section views.
P·03
Dual-Side Soap Dispenser — Consumer Product
Problem — A twin-outlet dispenser concept had to become a real, moldable 7-part product with working seals.
Solution — A full assembly — perforated face plates, housing, internals and seals — modelled for injection molding and ready to prototype.
P·04
Clevis Shackle Bolt — GD&T Machining Drawing
Problem — A load-bearing clevis shackle bolt needed a drawing tight enough to machine and inspect without back-and-forth.
Solution — A single machined part with a fully GD&T-toleranced production drawing — datums, feature control frames and callouts sized for CNC and QA.
P·05
Hydraulic Engine Lifter — Workshop Hoist
Problem — A workshop needed to lift and position engines safely, which meant a rolling hoist whose ram, frame and castors all had to resolve into one mechanism that actually moves.
Solution — A multi-part assembly built around a hydraulic actuator and telescoping rod, on a welded leg frame with castor wheels — mated so the lift travel can be driven and checked in-model.
P·06
Switch Box Enclosure — Housing Design
Problem — An electrical switch enclosure needed cut-outs, mounting bosses and a lid interface that would still be manufacturable once every feature was in.
Solution — A single parametric housing where the shell, apertures and fixing points are driven features — so a change to one dimension regenerates the whole box cleanly.
P·07
Clutch — Single-Plate Dry Clutch Assembly
Problem — A 240 mm dry clutch had to exist as a working assembly rather than one solid block, so the clamping, friction and torsional-damping functions could each be checked and revised on their own.
Solution — A 12-component parametric assembly — an 18-finger diaphragm spring, six tangential damper springs seated in the disc, and a splined hub — driven from disc diameter, spring count and clamp travel, with the engaged and released states modelled separately.
P·08
Candle Stand — Revolved Profile Part
Problem — A turned decorative stand had to be captured as a clean profile a lathe could actually follow, not an approximated shape.
Solution — One sketched profile revolved about its axis, with the curve controlled by dimensions rather than freehand geometry — so the form is exact and adjustable.
03 — How it works
Three steps. Forty-eight hours.
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01
Send what you have
A sketch, photo, PDF or physical part — plus what it needs to do. No CAD file required to start.
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02
I model & draw
I build the manufacturing-ready CAD and GD&T drawings, checking design intent with you along the way.
-
03
Delivered, ready to cut
Native + STEP files and production drawings, dimensioned and toleranced so your shop can quote and machine immediately.
04 — About me
A solo mechanical engineer who ships files, not just renders.
I'm Shahryar — a PEC-registered mechanical design engineer. For years I've turned ideas and existing parts into designs that reach the shop floor, with the datums, fits and callouts done right the first time. You work directly with me from brief to delivery: clear communication, honest timelines, and a 100% Job Success record across freelance projects since 2020.
- Direct, not agency. One engineer owns your project end to end — no handoffs, no drift.
- Manufacturing first. Every model is checked against how it will actually be machined or molded.
- Worldwide, async. Fully remote with daily EU & US hours overlap; NDA-friendly.
SolidWorksAutoCADGD&TDFMPython CAD Automation
05 — FAQ
Questions clients ask before sending files.
What file formats do you deliver?
Native SolidWorks (SLDPRT, SLDASM, SLDDRW), neutral STEP and IGES for any CAD system, AutoCAD DWG/DXF, and dimensioned PDF drawings. Flat-pattern DXF for sheet metal on request.
What do you need from me to start?
Whatever you already have: a hand sketch, photos of a physical part with key measurements, a legacy PDF drawing, or a 3D scan — plus a sentence on what the part needs to do. No CAD file is required to start.
How does the 48-hour turnaround work?
After you send your input I confirm scope and quote. Single parts and small assemblies are typically delivered within 48 hours of confirmation; larger assemblies or full drawing packages get an honest timeline up front.
Do you work under NDA — and who owns the files?
Yes — I'm happy to sign your NDA before you share anything. Project files stay confidential and full ownership of the delivered CAD transfers to you.
Can you produce drawings to GD&T standards?
Yes. Production drawings include datums, feature control frames, fits and tolerances in ASME Y14.5 style, sized so a machine shop can quote, cut and inspect without back-and-forth.
Do you work with international clients and time zones?
Yes — I work fully remotely with clients worldwide, with daily overlap of EU and US working hours. Everything is handled async by email with clear milestone updates.
Available for new projects
Send me your sketch, photo or part.
Tell me what it is and what it needs to do — I'll come back with exactly how I'd take it to manufacturing-ready files, and a 48-hour quote.
Email the project brief