Revolve Sphere

 


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CAD Modelling Challenge #20 — Engineering Drawing Breakdown NX Modelling Challenge | NXDATUM 04DTM23 This week's challenge is deceptively simple — a Ø100mm Sphere modelled using the Revolve feature in Siemens NX. One dimension. One operation. And yet, this is exactly where most beginners reveal a critical gap in their understanding of solid modelling fundamentals. Why a Sphere? Why Revolve? A sphere has no flat face, no natural extrusion direction, and cannot be created with a simple Boss-Extrude. This challenge forces you to think in terms of rotational geometry. The Revolve feature in Siemens NX creates a solid by rotating a 2D profile around a defined axis — and a semicircle revolved 360° around its diameter axis produces a geometrically perfect sphere. This is the correct approach, and the drawing explicitly instructs you to use it. Understanding the Drawing The front view shows a perfect circle with a single dimension — Ø100mm. This represents the full diameter of the sphere. The 3D isometric view confirms the resulting solid geometry. No auxiliary views, no hidden lines, no additional features. The entire challenge lives in one number and one operation — which means your sketch setup and axis selection must be exactly right. Modelling Strategy in Siemens NX Begin by creating a new sketch on any default datum plane. Draw a semicircle with a diameter of 100mm — not a full circle. The straight edge of the semicircle becomes your revolution axis. Add a centerline along that straight edge and constrain it properly. Exit the sketch, invoke the Revolve command, select your semicircular profile, define the axis along the centerline, and set the angle to 360°. The result is a solid sphere of Ø100mm. Common mistakes at this stage include sketching a full circle instead of a semicircle, selecting the wrong axis, or leaving the sketch under-constrained. Any of these errors will either fail the operation or produce an incorrect geometry. What This Challenge Tests This challenge tests your understanding of sketch profile selection for revolve operations, axis definition, and the fundamental concept that not all geometry begins with an extrusion. If you instinctively reach for Boss-Extrude on every model, this challenge is a direct correction to that habit. Master the Revolve feature here — it becomes critical when modelling shafts, wheels, flanges, and turned components later in your CAD journey. Model the sphere in Siemens NX, calculate mass properties, and submit your answer on the NXDATUM validation tool to verify your result. Created by NXDATUM | Siemens NX CAD Modelling Series | All dimensions in mm | Scale 1:1 | Sheet A4
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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