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CAD Modelling Challenge #11 — Engineering Drawing Breakdown NX Modelling Challenge #11 | NXDATUM 04DTM23 This week's challenge features a compact mounting pad or grooved spacer block. Unlike our previous large-scale linkages, this component focuses heavily on precise internal pocketing and blind features. With an overall footprint of 70mm x 50mm and a maximum thickness of 20.5mm, this part requires careful attention to wall thicknesses, edge blends, and the internal depths revealed in the section view. Top & Front Views — The Outer Profile and Recess The top view establishes the main rectangular body — 70mm wide and 50mm high. The outer corners feature a distinct R10 edge blend. Inside the front face, there is a recessed pocket that maintains a 2.5mm wall thickness on the sides, along with its own internal R10 corner radii. The front profile view (bottom left) is crucial: it indicates the main block thickness is 20mm, with an additional 0.5mm raised lip detailing on the front face, bringing the total height to 20.5mm. Section A-A — The Rear Slots Section A-A is critical for understanding the hidden features on the back face of the model. It cuts directly through the centre, revealing two longitudinal grooves or slots. These blind cuts have a depth of 7mm and are spaced 18mm apart (center-to-center), with a profile diameter of Ø13.3mm. The section also clearly highlights the cross-section of the front recessed pocket and the small top lip. In Siemens NX, these rear slots can be created using a straightforward Extrude (Subtract) operation from the back plane. Modelling Strategy in Siemens NX Start by sketching the base 70x50mm rectangle on your primary datum plane and extrude it to the 20mm base thickness. Apply the R10 Edge Blends to the four outer vertical edges. Next, sketch on the front face to create the 0.5mm raised lip and the internal recessed pocket using the 2.5mm offset dimensions and Extrude (Subtract). Finally, flip the model to the back face, sketch the two slot profiles using the 18mm spacing dimensions, and use Extrude (Subtract) to a depth of 7mm. What This Challenge Tests This model tests your ability to manage multiple extrusions across different faces, maintain consistent offset wall thicknesses, and accurately interpret section views for blind features. While simpler than a swept organic shape, ensuring the front pocket and rear slots are perfectly aligned and dimensioned requires solid fundamental constraint logic. 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 A2
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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