← All projects
Drag to rotate · pull parts out · put them back
01 · 3D CAD & assemblies
HT-20 air tank in FreeCAD
A 20 L, 11 bar air tank first designed in SolidWorks, then rebuilt from scratch in FreeCAD with parametric parts, an assembly and TechDraw sheets. Each part was compared with the SolidWorks model.
Interactive 3D
Drag to rotate · pull parts out · put them backSpecifications
- All dimensions come from one spreadsheet: 20 values and 2 formulas
- 12 of 12 sketches fully constrained
- Assembly: 10 components, 9 fixed joints, interference 0
- Volume vs SolidWorks: 4 of 6 parts within 0.001 %; the two threaded sockets differ by 0.68 % and 0.66 % (thread root)
- 3 A3 drawings made with TechDraw
- FEM (CalculiX): peak 103.0 MPa at design pressure 1.1 MPa (corroded), allowable S 137.9 MPa; hydrotest 1.43 MPa peak 89.9 MPa
- Method check on a plain cylinder: -0.003 % against Lame
- Nozzles, welds and legs were not modeled in the FEM
Images · 5
- 01 · 3D model
- 02 · FEM result with CalculiX: peak 103 MPa at the head knuckle (design, corroded)
- 03 · HT-00 general assembly, 1:5, balloons and parts list, A3
- 04 · HT-03 G1/2 sleeve, 5:1, section A-A, 10:1 thread detail, A3
- 05 · HT-05 foot, 1:2, three views, A3