I love designing in Siemens NX, but keeping these files on my hard drive doesn't help anyone. I decided to put them out here for anyone who needs to practice material. Whether you're a student or just love CAD like I do, feel free to use these blueprints to sharpen your skills.
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CAD Modelling Challenge — Engineering Drawing Breakdown
NX Modelling Challenge #15 | NXDATUM 04DTM23
This week's challenge is a clevis arm bracket — a single-arm pivot mount used in linkage mechanisms, actuator mounts, and hinge assemblies across automotive and industrial applications. The part looks simple in the isometric view, but the combination of a cylindrical boss, a narrow arm extension, and multiple fillet sets makes the sketch planning non-trivial.
Reading the Front View
The front view establishes the primary geometry — a 60mm total length, 40mm height block with a Ø40 cylindrical boss on the right end. The boss is centred on the right face and carries a through-bore, visible as a concentric circle inside the Ø40 profile.
The left portion of the part narrows into an arm — this transition is not a simple step but a blended reduction that connects the full-height block to the arm extension. This profile must be captured entirely within your base sketch before extrusion.
Right-Side View — Depth and Step Profile
The right-side view shows a total depth of 50mm with a 10mm raised step on the upper surface and an R2 fillet at the step transition. This confirms the main body is not a uniform thickness — the upper step creates a seating ledge, likely for a mating component or washer face. Model this as a secondary extrusion or a cut operation on the top face after the base body is established.
Left-Side View — The Arm and Fillet Set
The left-side view is where the arm geometry is fully defined — 30mm arm length, 20mm arm height, with 2× R10 fillets on the arm corners and a small bore centred on the arm face.
The arm bore is a clearance or pin hole for linkage attachment. The 2× R10 fillets on the main body noted in the front view are structural blends between the arm and the boss block — these are load-bearing transitions, not cosmetic, and their radius must be modelled exactly.
Modelling Strategy in Siemens NX
Begin by sketching the complete front profile — the full block with the arm extension and the circular boss outline as one closed sketch — on the front datum plane. Extrude to 50mm. Cut the upper step using a rectangular profile on the top face to the 10mm depth shown in the right-side view.
Add the Ø40 boss as a separate extrusion on the right face if not already captured in the base profile, then cut the through-bore concentrically. Place the arm bore on the left face using the dimensions from the left-side view. Apply the 2× R10 body fillets and the R2 step fillet last, in a single edge blend operation where possible.
What This Challenge Tests
This task tests integrated profile sketching for compound shapes, step feature creation from side-view data, multi-fillet management, and bore placement on non-primary faces.
The clevis bracket is a staple component in mechanical design — if you can model this cleanly with a minimal feature count and a fully constrained sketch, your NX fundamentals are solid. 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 A3
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