Clevis Fork Mount

NXDATUM VALIDATION TOOL

NX Model Validation

NXDATUM CAD Education Portal

⏱️ Time: 00:00:00

Measurement Unit: Grams (g) Kilograms (kg)

Calculated Mass (Measure Body):

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CAD Modelling Challenge #4 — Engineering Drawing Breakdown NX Modelling Challenge #4 | NXDATUM 04DTM23 This week's challenge is a heavy-duty angular clevis block with an internal counterbore. This model is a perfect exercise for those wanting to master angular geometry and subtractive feature placement. The key to this part is correctly identifying the relationship between the front bore, the side profile angle, and the internal U-cutout. The Main Body and Angular Cut The overall length of the part is 90mm, with a square rear face of 50mm x 50mm. The front of the clevis features a full R30 radius, which defines the rounded mounting ends. A critical feature of this challenge is the slanted side profile—the cut begins 26mm from the rear face and slopes down at a 110° angle from the bottom edge. Correctly sketching this profile on the side plane is the first major step for a robust model. The Front Bore and Internal Pockets Looking at the rear face, we have a complex internal hole. It starts with a large Ø35 counterbore that is 2mm deep, leading into a Ø20 through-hole that penetrates 15mm into the block before opening up into the main U-channel. The internal U-channel itself is 30mm wide, creating two arms that are each 10mm thick (since the outer width is 50mm). Note the R1.5 fillet inside the channel corners—this is a small but essential detail for structural integrity in real-world parts. The total width of the tiered side section is 42mm, implying a 4mm offset on each outer face. Hole Alignment and Positioning There are two types of holes on the side arms: Main Pivot Hole: A Ø22 through-hole positioned exactly 65mm from the rear face, centered vertically at 25mm. Small Locking Hole: A Ø5 hole located 25mm from the rear face and 17.5mm up from the bottom edge. Precision in these coordinates is vital for the mass properties validation tool. Modelling Strategy in Siemens NX Primary Block: Start with a 50x50x90mm block. Use a side-view sketch to define the 110° angular cut and the R30 front radius, then use Extrude to trim the overall shape. Rear Bore: Use the Hole command from the rear face to create the Ø35 x 2mm counterbore and the Ø20 inner hole. U-Channel: For the internal fork, sketch the 30mm wide channel on the top datum plane and extrude it downwards with the Subtract boolean. Side Features: Finally, add the Ø22 and Ø5 side holes and don't forget the R1.5 Edge Blends inside the channel. Using the Unite boolean correctly here will ensure your model behaves as a single solid body. What This Challenge Tests This challenge evaluates your ability to interpret angular dimensions (110°), manage complex internal bores with multiple diameters, and accurately position holes across different geometric tiers. The combination of the counterbore and the fork makes it a high-level test of your subtractive modeling 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