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CAD Modelling Challenge — Engineering Drawing Breakdown NX Modelling Challenge #17 | NXDATUM 04DTM23 This week's challenge is a flanged pipe connector with an angled spigot port — a hydraulic or pneumatic fitting-style component that combines a square mounting flange, a cylindrical through-bore, and a 45° angled boss. With three section views on a single sheet, this is one of the most drawing-intensive challenges in the series. If you cannot read Section A-A, B-B, and C-C simultaneously, you will not model this correctly. Breaking Down the Front View The front view establishes the square flange face — overall dimensions indicated with a 17.5mm offset from center and a 17.7mm bolt hole spacing. The flange carries 4× R3 corner radii, giving it a rounded-square profile rather than a sharp rectangle. The central bore is visible as a large circular cutout. Section cuts A-A and B-B are both taken through this view, meaning the internal geometry differs significantly along each axis — pay close attention to what each section reveals independently. Section A-A and Section B-B — Internal Geometry Section A-A shows the primary through-bore channel — a 25mm deep cavity with a square outer flange and the cylindrical bore passing through. This is your main extrusion body. Section B-B is more revealing: it shows a 3.6mm wall thickness on the bore, a Ø5 small port, a R10 external blend, and asymmetric step depths of 12.5mm on both sides. This stepped internal profile cannot be assumed from the front view alone — it must be modelled as a separate revolve or shell operation on the boss geometry. Section C-C — The 45° Angled Boss This is the most technically demanding feature on the drawing. Section C-C reveals a Ø15 bore at 45° intersecting the main body, with a total boss length broken into 10mm, 20mm, and 24.1mm segments along the angled axis, and a 65mm overall reference. The angled face shows knurling or thread-like features — visible as parallel lines in the side view — indicating a threaded or serrated spigot. The 3× R2 fillets at the base of this boss are critical for mass accuracy. In Siemens NX, this requires creating a 45° datum plane referenced from the main body centerline, sketching the boss profile on it, and using an angled extrusion or revolve to generate the solid. Modelling Strategy in Siemens NX Begin with the square base plate and extrude the main body to the depth shown in Section A-A. Apply the 4× R3 corner blends to the flange. Cut the central through-bore using a hole or extrude-cut operation. Build the stepped internal walls per Section B-B using a shell or layered cut. Create a 45° datum plane and construct the angled spigot boss on it — extrude outward, then cut the Ø15 internal bore through the angled axis. Add the 3× R2 fillets at the boss-to-body junction last. Knurl or thread features are cosmetic in NX for mass purposes and can be represented as a surface pattern without affecting the solid body mass. What This Challenge Tests This task tests three-section-view interpretation, angled datum plane construction, stepped bore modelling, and feature sequencing on a complex organic body. This drawing gives you more information than most — the challenge is organising it into a clean, parametric feature tree without creating dependency conflicts. If your model matches all three section cuts and your mass properties are consistent, you have successfully completed one of the hardest challenges in this series. Complete the model in Siemens NX, run mass properties, and submit your answer on the NXDATUM validation tool. Created by NXDATUM | Siemens NX CAD Modelling Series | All dimensions in mm | Scale 1:1 | Sheet A3