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CAD Modelling Challenge #10 — Engineering Drawing Breakdown NX Modelling Challenge #10 | NXDATUM 04DTM23 This week's challenge is a precision cylindrical shaft featuring an annular groove and a keyway — a fundamental power transmission component. While it may look simpler than our previous swept models, this part requires precise location of features along a cylindrical face and accurate interpretation of keyway depths. Front View — The Main Shaft Body The front view outlines the overall cylindrical profile. The shaft has a total length of 100mm, defined by a 15mm left section and an 85mm right section, both measured from the center of the radial groove. The main outer diameter is Ø30mm, with a secondary stepped diameter of Ø28mm. The groove itself has a full radius of R5. Both the left and right ends of the shaft are finished with a C1 (1mm x 45°) chamfer to remove sharp edges. Top & Side Views — The Milled Keyway The top view and the side profile detail the closed-end keyway slot. The slot is 24mm long and 6mm wide, featuring fully rounded ends (R3). Positioning is critical here: the right edge of the keyway begins exactly 23mm from the right-hand face of the shaft. The side cross-section view reveals the depth of the cut, which is 3.5mm measured down from the outer cylindrical surface. Modelling Strategy in Siemens NX The most efficient approach in Siemens NX is to use the Revolve feature. Sketch half of the shaft's cross-section profile on a primary datum plane (incorporating the Ø30/Ø28 diameters, the R5 groove, and the C1 chamfers) and revolve it 360 degrees around the center axis. For the keyway, create a datum plane tangent to the top surface or sketch on a parallel base plane. Sketch the 24x6mm slot and use the Extrude (Subtract) command, ensuring the cut goes exactly 3.5mm deep into the shaft body. What This Challenge Tests This challenge evaluates your ability to model turned parts efficiently using the Revolve command rather than stacking multiple cylinder extrusions. It also tests your accuracy in positioning secondary features (like the keyway) on curved surfaces and interpreting partial section views for depth dimensions. 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
This platform is curated by 04 DTM 23, a mechanical engineering professional with a background in Tool and Die Making from the Indo-German Tool Room. Driven by a strong passion for advanced 3D modeling, precision engineering, and computer-aided design—specifically utilizing Siemens NX—this blog serves as a dedicated repository for CAD drawings and design practice. The core objective of NXDATUM is to share high-quality, practical design exercises, document technical progression, and build a valuable resource for fellow designers and engineering enthusiasts aiming to refine their CAD proficiency and mechanical design skills.

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