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CAD Modelling Challenge #6 — Engineering Drawing Breakdown NX Modelling Challenge #6 | NXDATUM 04DTM23 This week's challenge is a multi-tiered machine base with complex profile cutouts. This part is a fantastic test of your spatial reasoning—requiring you to visualize how different vertical levels and subtractive features (like the U-slots and semi-circular grooves) interact across the X, Y, and Z axes. Base Plate and Front Slot The overall footprint of the base is 96mm in length and 64mm in width, with a uniform base thickness of 16mm. At the front end, there is a U-shaped slot cut into the base. This slot is 24mm deep and 16mm wide, positioned exactly 16mm from the left edge and 12mm from the right edge (as indicated by the 64mm total width breakdown). The Vertical Tier and Gussets The model rises in several stages. On the left side, a tall vertical wall stands at an overall height of 30mm from the top of the base plate (making the absolute height 46mm). This wall is 16mm thick and features a top flat section of 20mm before sloping down. Supporting this wall is a lateral gusset with a height of 34mm. On the opposite side, a smaller triangular gusset provides structural support, rising to a height of 28mm from the base plate. Notice the 20mm depth dimension for the top flat section of this right-hand support—consistency in these smaller dimensions is key for a successful model. The Middle Block and Semi-Circular Groove The centerpiece of this model is a raised rectangular block positioned 22mm from the rear vertical wall. This block has a width of 40mm. Centered on the top face of this block is a semi-circular groove (a half-cylinder cut) with a diameter of Ø24mm. In Siemens NX, ensure this cut is perfectly centered along the 40mm width to maintain symmetry. Modelling Strategy in Siemens NX For the most efficient workflow in Siemens NX, try this sequence: Base Feature: Start by extruding the main 96x64x16mm base block. Use the Extrude (Subtract) command to create the 24x16mm front slot. Supports: Next, sketch the side profiles of the tall rear wall and the two side gussets on their respective planes and extrude them to their specific widths (16mm for the rear wall). Raised Block: Create the middle block as a separate extrusion. To create the Ø24 semi-circular groove, sketch a circle on the face of the block and use Extrude (Subtract). Finalize: Always use the Unite boolean to merge these features into a single solid body before finishing. What This Challenge Tests This challenge evaluates your ability to manage multiple height references (16, 28, 30, and 34mm) without getting confused. It also tests your precision in centering circular features on prismatic blocks and managing subtractive operations in tight spaces. 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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