Custom Laboratory Liquid Measurement Device Design

About the project

Job Title: Optomechanical/Product Design Engineer Needed for Custom Laboratory Liquid Measurement Device (CAD/STEP) Project Overview: We are designing a high-precision fuel density and volume testing device. We require a manufacturing-ready 3D CAD model (STEP/IGES formats) of a custom 500 mL testing beaker assembly. The assembly integrates a borosilicate glass beaker, an automatic overflow/spillover mechanism, a sapphire glass optoelectronic sub-chamber, a floating target, and embedded sensors. We need 3 to 5 physical prototype units produced, so the design must be optimized for small-batch specialized manufacturing (scientific glass blowing/machining and precision optical assembly). Key Design Components & Scope: 1. Beaker Geometry (Borosilicate Glass): * Must hold an internal volume of exactly 500 mL from the base up to the lower lip of a side-mounted overflow spout. * Features an integrated, downward-angled overflow spout. The transition edge must be a sharp knife-edge to prevent liquid surface tension from holding back fluid. * Flat, uniform base for clean seating on an external load cell. 2. Optoelectronic Sub-Chamber & Lid Assembly: * A sealed metal/polymeric lid housing a Time-of-Flight (ToF) laser distance sensor. * The sensor must look through a circular Sapphire Glass Shield to isolate it entirely from volatile fuel vapors (petrol). * Must include an engineered gland/groove for a Viton O-ringproviding a reliable gas-tight seal (target 15% to 20% compression) without inducing fracturing stresses on the brittle sapphire glass. * Mount must hold the ToF sensor perfectly perpendicular (90°) to the window. * Provision/thread port to mount a **NTC/PT100 Temperature Probe** extending down near the bottom of the beaker. 3. Floating Target Disc (PTFE): * A lightweight, custom-profiled floating disc machined from black virgin PTFE (Teflon). * Must feature a "Top-Hat" stepped profile (raised central platform to act as a dry laser target; lower outer buoyancy ring to prevent tilting/surface tension wrapping). * Tolerances must allow the disc to slide smoothly up and down the beaker wall without jamming or drifting into the overflow channel. Required Freelancer Deliverables: * Production-ready 3D CAD Assembly (Native files + .STEP and .IGES). * Individual component files ready for manufacturing submission. * 2D Technical Drawings with explicit dimensioning and geometric tolerances (GD&T), specifically focusing on the O-ring compression gland and the glass-to-metal sealing interfaces. Preferred Qualifications : * Strong background in Optomechanical Engineering, Scientific Apparatus Design, or Enclosure Design for Volatile Environments. * Proven experience designing seals for glass, sapphire, and fuel-resistant elastomers (Viton). * Ability to advise on DFM (Design for Manufacturing) when working with specialized scientific glass blowers and precision CNC machine shops in India.

Skills required