Motorized Sit-Stand Desk

ROLE Act as a senior mechanical design engineer (design for manufacturing, assembly, SERVICE and LOW COST; weldments; 3D-printed parts; standard components) AND a FreeCAD Python macro developer. Build a professional, practical, parametric CAD model of a motorized sit-stand desk (height mechanism + depth mechanism) in FreeCAD, exportable to SolidWorks 2020 as STEP, plus a control GUI tab inside FreeCAD. This is a REVISION: keep what is FROZEN, apply every CHANGE. ATTACHMENTS Image 1 (my SolidWorks frame) with three parts labelled A, B, C. Image 2: the simple gear box photo. Image 3+: depth-mechanism references. Earlier macros (Simple_Column_Gearbox, Drive_Frame_1000mm): reuse their Gears-workbench bevel-gear code (orientation detection, diagnostics, no fake gears). WORKFLOW FreeCAD is run by me. Target FreeCAD 0.21.x or 1.0 and name every addon. If you can run freecadcmd, test each module and report honestly; otherwise say the code is UNTESTED and add try/except + diagnostics. Work in phases; STOP after each until I write "next": Phase 0: concept + dimension table (confirmed / assumed / calculated / awaiting supplier), part-count plan (before vs after), height budget (incl. depth module), decision tables, fastener schedule, clearance matrix, service scenarios, risks, addons. Phase 1: calculations. Phase 2: parametric macro (one function per part; parameters block at the top). Phase 3: assembly + control tab. Phase 4: STEP exports, BOM, fastener list, weld map (text), unresolved checks.

Parameters

This model was generated without adjustable parameters. Open it in the editor to add your own dimensions.

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.