SolidWorks Job — Parametric Helical Coil Tower ( Immediate Start Required)

--- ## Scope of Work We need a **parametric 3D SolidWorks model** of a vertical helical coil tower used as a gas cooling and condensation unit in an industrial measurement system. The coil will be manufactured externally (tube bending shop), so the model serves as the manufacturing specification. **Deliverables:** - SolidWorks part/assembly (.sldprt / .sldasm), fully parametric - Manufacturing drawings per coil zone (tube length, coil diameter, pitch, number of turns, end connections) as PDF + .slddrw - Overall assembly drawing with key dimensions (height, outer diameter, connections) - STEP export (.step) for the bending shop - Bill of materials (BOM) - Optional: rendered isometric view for project documentation --- ## Functional Description A single continuous stainless steel tube is wound into a vertical helical coil with three stacked temperature zones. Gas enters at the top and exits at the bottom, cooling progressively as it passes through each zone. Condensate runs down by gravity ("water slide" principle) into a collection vessel at the base. The coil axis is strictly vertical. There is **one continuous gas path** (series connection) and **one collection vessel** at the bottom. --- ## Geometry Specification ### Tube | Parameter | Value | |---|---| | Material | Stainless Steel AISI 304 (1.4301 / V2A) | | Outer diameter | **16.0 mm** | | Wall thickness | 1.5 mm | | Inner diameter | 13.0 mm | | Construction | One continuous tube, **no welds** in the coiled section | ### Helix Parameters (must be parametric — see Design Table below) | Parameter | Value | Notes | |---|---|---| | Coil diameter (tube centerline) | **350 mm** | Main parameter, optimized for shipping | | Helix radius (centerline) | 175 mm | = coil diameter / 2 | | Pitch (axial rise per turn) | **18 mm** | Parametric (alternative: 22 mm for steeper drainage gradient) | | Helix angle | ≈ 0.94° | = arctan(pitch / (π × D)) | | Outer envelope diameter | 366 mm | = 350 + 16 (clearance) | | Inner free diameter | 334 mm | = 350 − 16 | ### The Three Coil Zones (series connection, top to bottom) | Zone | Function | Tube Length | Turns | Height (at 18 mm pitch) | |---|---|---|---|---| | **1 (top)** | Primary cooling | **30 m** | ≈ 27.3 | ≈ 491 mm | | **2 (middle)** | Secondary cooling | **10 m** | ≈ 9.1 | ≈ 164 mm | | **3 (bottom)** | Deep cooling | **10 m** | ≈ 9.1 | ≈ 164 mm | **Total tower height** (3 zones + 2 × approx. 100 mm transition sections): **≈ 1,119 mm** (~1.12 m). At 22 mm pitch the tower grows to ≈ 1.30 m (provides steeper drainage angle). --- ## Design Requirements 1. **Continuous helix:** The three zones form one unbroken tube. Zone transitions are modeled as short vertical or gently curved connector segments (≈ 100 mm each). No break in the gas path. 2. **Vertical tube ends:** Gas inlet (top) and gas outlet (bottom) as **straight, vertical tube stubs** (≈ 80–100 mm length each) for easy connection. 3. **Vertical axis:** The helix axis must be vertical. Every turn must have a downward slope — no "water traps" where liquid could pool. 4. **Cooling jacket (optional, second phase):** Each zone will eventually be surrounded by a cooling jacket / shell (double-pipe heat exchanger, counterflow). Model this as a **separate, suppressible sub-assembly**. For now, the bare coil is sufficient. 5. **Collection vessel:** At the base, model a connection stub to a cylindrical stainless steel vessel (approx. Ø 330 × 700 mm, 30 liters) — a simplified placeholder body with the connection geometry is sufficient. 6. **Support frame:** A simple support structure (stainless steel square tube or struts) that holds the three zones and keeps the tower axis vertical. Conceptual level is fine. --- ## Design Table (Parametric Control) The following dimensions **must** be controllable via a SolidWorks Design Table / configuration table so that variants can be generated without remodeling: - Coil diameter D (default 350 mm; variants 300 / 400 mm) - Pitch (default 18 mm; variants 14 / 22 mm) - Tube length per zone (default 30 / 10 / 10 m) - Tube outer diameter and wall thickness (default 16 / 1.5 mm) **Dependent values** (number of turns, zone height, total tower height) must calculate automatically. **Formulas to embed:** - Turns per zone = tube length / (π × D) - Zone height = turns × pitch - Helix angle = arctan(pitch / (π × D)) --- ## Drawing Standards and Quality Requirements Drawings must be **technically correct AND professionally executed**. A drawing that is dimensionally right but sloppily drafted will not be accepted. **Applicable standards:** - Technical drawings per **ISO 128** (line types and weights) - Dimensioning per **ISO 129-1** - **First angle projection (ISO-E)**, projection symbol in title block - Title block and BOM per **ISO 7200**; sheet formats per **ISO 5457** (A3 or A4 as appropriate) - Preferred scales per **ISO 5455** (1:1, 1:2, 1:5, 1:10); scale stated in title block - GD&T where needed per **ISO 1101**; general tolerances per **ISO 2768-mK** - Surface finish notation per **ISO 1302** **Quality expectations:** - Clean, consistent line work: correct line types and weights; no open corners, no overhanging or missing lines - Complete, unambiguous dimensioning: every dimension exactly once; no duplicates or omissions; dimension chains logical and non-overlapping - Tidy layout: views logically arranged with sufficient spacing; no overlapping annotations; centerlines and symmetry axes placed - Legibility: uniform font size and style; labels horizontal and readable; consistent part naming - Complete title block: part name, drawing number, material, scale, projection symbol, author, date, general tolerance class - Consistency: views must agree with each other; sections correctly hatched (45°, uniform) The standard is what an experienced mechanical designer would call **production-ready and presentation-quality**. These drawings represent a professional engineering project. --- ## What Is NOT Part of This Job - Flow simulation or thermal analysis (CFD) — the thermal design is already complete - Detailed modeling of the collection vessel (it is a purchased part; only a placeholder + connection geometry) - Instrumentation or control system design (handled separately) --- ## Reference Information - The thermal design, flow rate tables, and condensate calculations are available and will be shared upon assignment. - A reference photo of a similar coil (~30 m tube, Ø 12 × 1.5 mm, vertical ends, no welds) will be provided. - Design point: 2.0 m³/h gas flow; total condensate ≈ 9.2 kg over 5 hours. --- ## Before You Start Please confirm the choice of **pitch 18 mm vs. 22 mm** (tower height vs. drainage gradient trade-off) before beginning detailed modeling. We will clarify this immediately upon assignment. **To apply:** Please share 1–2 examples of parametric helical/coil models you have built in SolidWorks, and confirm you can start immediately.