# Solution for Problem 4: 3D Solid Modeling (SolidWorks) ## Step 1: **Analyze and Sketch the Main Profiles** - **Identify Main Features:** - The object consists of three primary sections: 1. The base with rounded ends 2. The vertical support 3. The top cylindrical boss with a through hole - **Key Dimensions (in mm):** - **Base:** 70 (length) × 20 (width) × 20 (height), fillet R20 and R10 at the ends - **Vertical Support:** 60 (height), thickness 10 - **Cylindrical Boss:** Outer Ø40, length 35, inner through hole Ø20, C bore to Ø30 × 6 deep - **Other holes:** Ø15 at the base, located at center **Example Sketch for Base Profile:** - Draw a rectangle, 70 mm × 20 mm, with semicircular ends (R20 on one side, R10 on the other). - Add vertical support rectangle 60 mm tall, 10 mm thick, offset 10 mm from side. - Sketch the boss on top, centered, with a 40 mm diameter. --- ## Step 2: **Extrude and Cut Features** 1. **Extrude the Base and Support:** - **Base:** Extrude the sketched base to 20 mm. - **Support:** Extrude the vertical support rectangle from the base to 60 mm. 2. **Add Boss and Holes:** - **Boss:** Draw a circle (Ø40) on the top face, extrude it 35 mm. - **Through Hole:** Cut a Ø20 hole through the boss. - **Counter Bore:** Add a counter bore (Ø30, 6 mm deep) on both sides of the boss. - **Base Hole:** Add a Ø15 hole at the base center. **Example SolidWorks Feature Sequence:** - Extrude Base: 20 mm thick - Extrude Support: 10 mm thick, 60 mm tall - Extrude Boss: 40 mm diameter, 35 mm long - Cut Boss Hole: 20 mm diameter through-all - Counter Bore: 30 mm diameter, 6 mm deep - Cut Base Hole: 15 mm diameter --- ## Final Answer **The final solid model will match all the provided dimensions and features as shown in the figure.** All sketches must be **fully defined** in SolidWorks, and the final model should look like the given drawing. --- ### Sample Graphical Representation  *Alt text: Example of a similar 3D part model and its sketches in SolidWorks.* --- ### **Summary Table of Steps** | Step | Action | Key Dimension(s) | |------|-----------------------------------------|----------------------| | 1 | Sketch base with fillets and support | 70×20, R20, R10, 10 | | 2 | Extrude base and support | 20 mm, 60 mm | | 3 | Sketch & extrude top boss | Ø40, 35 mm | | 4 | Cut through holes & counter bores | Ø20, Ø30×6, Ø15 | --- **Tip:** Use the "Fully Define Sketch" tool in SolidWorks to ensure all sketches are constrained. **Final Output:** Save your part as `Problem_4_LastName.SLDPRT` and submit as required.