hollow cylinder 3d model

Updated SolidWorks Step-by-Step Guide: SBSC Mini Tube (Total Length = 85 mm) All unchanged parameters: D_i=2.0\ \mathrm{mm},\ D_o=2.4\ \mathrm{mm} Single saddle cavity axial length =1.5 mm, cavity depth=0.2 mm 1 block = 3 cavities, cavity pitch inside block =3 mm → each block length = 9 mm Smooth recovery gap between blocks =6 mm One repeating cycle (block + gap) = 9+6=15\ \mathrm{mm} Total tube length = 85 mm, flow direction: Left → Right Step 1: Create outer solid tube body 1. New Part, Unit: MMGS (mm, gram, second) 2. Front Plane → Sketch 3. Draw circle Ø2.4 mm, center at origin. 4. Exit sketch. 5. Boss-Extrude, Blind depth = 85 mm → OK. Step2: Cut inner hollow bore 1. Click the right end face of the rod → Sketch 2. Concentric circle Ø2.0 mm 3. Exit sketch 4. Cut-Extrude, Blind depth = 85 mm → OK. Now you have smooth hollow tube, OD 2.4 / ID 2.0, length 85 mm. Step3: Sketch one asymmetric saddle cavity profile Same as before: 1. Create reference plane passing through t