🛠️ Project Overview

• Project Name Red Dead Inspired Aluminum Bull Skull
• Machine HiMill D1S Desktop CNC
• Core Challenge 3D Relief Carving in Aluminum
• Applications Belt Buckle, Motorcycle Charm, Keychain
• Difficulty ⭐⭐⭐⭐⭐ (Metal Machining)
• Time Approx. 1 Hour
• Material 3mm thick 6061-T6 Aluminum Plate

📋 1. Preparation

Machining aluminum is a different beast compared to wood. Heat dissipation and chip evacuation are the keys to success.

🧰 Bits & Tooling

1. Roughing: 3.175mm (1/8") Single Flute Spiral End Mill. (Pro Tip: Large flute valleys are essential for clearing chips!)
2. Finishing: 2mm Ball Nose End Mill.

🪵 Hardware & Materials (BOM)

• Stock: 6061-T6 Aluminum. Excellent machinability and less prone to "gumming up" the tool.
• Workholding: Clamps + Double-sided tape. The workpiece must be rock-solid to handle vibrations.

💻 2. Design & CAM Strategy

This is the most critical phase. When milling metal on a desktop machine, the "slow and steady" approach wins. The design is based on the classic Texas Longhorn aesthetic with a recessed slot on the back for mounting hardware.

Step 2.2: CAM Parameters (The Secret Sauce)

Roughing Pass: 13,000 RPM | 200 mm/min | 0.1mm - 0.2mm Depth of Cut.

Finishing Pass: 200 mm/min | 0.1mm Stepover. (An ultra-fine stepover creates a pre-polished luster directly off the machine.)

⚙️ 3. The Machining Process

Eyes on the workpiece, goggles on, and let the chips fly!

1. Workholding: Ensure the plate is perfectly flat and the clamps are torqued down.
2. Roughing: The HiMill D1S begins hogging out the material efficiently.
3. Finishing: Swapping to the ball nose bit to transform rough edges into smooth, rounded contours.

🎨 4. Post-Processing & Showcase

Raw aluminum is bright, but it lacks that "weathered" look. We used a needle file for deburring and 600–1000 grit sandpaper to remove microscopic tool marks, giving it a rugged, vintage patina.

🎉 Performance Summary

The HiMill D1S maintained a crisp acoustic signature throughout the cut. No skipped steps or noticeable chatter marks—proving the frame is rigid enough for professional-grade light metalwork.