Triple Bore Yoke Bracket

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CAD Modelling Challenge #2 — Advanced Engineering Breakdown NX Modelling Challenge #2 | NXDATUM 04DTM23 This week's challenge is a high-precision triple clamp or structural yolk. This is one of the most complex models in the series so far, requiring expert-level interpretation of section views, detail views (Scale 2:1.5), and multi-plane pocketing. This part is a true test of your ability to manage a heavy feature tree in Siemens NX while maintaining dimensional accuracy. The Main Profile — Curved Geometry The base profile of the yolk is defined by a large 200mm span from end to end. The central hub has an R35 outer radius, while the two outer mounting circles feature an R33 and R35 profile. The geometry is not straight; it follows a curved path with a 22° angle on the right wing. Identifying the correct center points for the R207 and R130 arcs is critical to getting the outer "web" shape correct. Internal Bores and Section A-A The central mounting point is highly detailed, as seen in Section A-A. It features a stepped internal bore starting with a Ø50 counterbore (11mm deep), leading into a Ø43 and finally a Ø24 inner diameter. The overall thickness of the central block is 32mm. On the outer ends, the large vertical bores have a Ø50 diameter. Notice the 2 x 45° chamfers and R2 fillets that are scattered throughout the internal edges—missing these will significantly alter your final mass properties. Detail Views — Slots and Pockets This drawing uses Detail Views to explain the smaller, high-precision features: Detail B: Shows a complex internal pocket with a 22° orientation and specific R4 corner radii. It also specifies a 15mm width and 13mm depth reference. Detail E: Highlights the side-clamping slot, featuring a Ø10.50 entry hole and a Ø22 secondary bore. This is where the clamp "pinches" the fork tubes. Top View Slots: There is a central oblong slot (32mm long) and various Ø8 and Ø14 through-holes that must be positioned relative to the central datum. Modelling Strategy in Siemens NX Master Sketch: The best approach in Siemens NX is to start with a master sketch on the XY plane to define the 200mm span and the main curved "web" profile. Extrude this as your base body. Central Hub: Use the Hole command or Revolve to create the complex central stepped bore from Section A-A. Angular Features: For the outer clamping sections, use Datum Planes oriented at the 22° angle to sketch the Detail B and Detail E profiles. Use the Pocket or Extrude (Subtract) tools for the internal cutouts. Finishing: Finally, apply the extensive list of R2, R30, and R1.50 Edge Blends as your last features to ensure model stability. What This Challenge Tests This model is a "Final Exam" in blueprint reading. It tests your ability to synthesize information from five different views (Top, Front, Section, and two Details). It evaluates your proficiency with angular offsets, complex booleans, and large-scale symmetric modeling. 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 1:2
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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