Project Overview

• Project NameKinetic Gear Open/Closed Sign
• Equipment UsedHiMill D1S Desktop CNC
• MechanismGear Transmission + Linkage Flip Structure
• Design StyleHigh-contrast industrial black & white aesthetic
• Main MaterialPremium Thick Basswood Plywood
• Cycle TimeApprox. 5 Hours
• Difficulty Level★★★★☆ (Tests CNC precision, assembly, and tuning)

Preparation & The "Real Estate" Workholding Trick

For the gears to spin smoothly, the flatness of the wood and the workholding method are crucial. According to our blueprints, we need to cut a large area of gear sets.

1. Materials List (BOM)

• 3 pcs: 300 × 210 × 10mm Premium Basswood Plywood
• 1 pc: 210 × 150 × 3mm Premium Basswood Plywood
• 2 pcs: 210 × 150 × 10mm Premium Basswood Plywood
• 6mm Wooden Dowels
• Miniature Bearings: Inner Diameter (ID) 6mm, Outer Diameter (OD) 17mm, Thickness (Width) 6mm.

2. Tooling

• 3.175mm (1/8″) Single Flute Spiral End Mill

Core CNC Parameters (Tested & Proven)

The gear tooth profiles and meshing require high machine precision. Here are the optimal basswood cutting parameters dialed in on the HiMill D1S:

• Tool Type: 3.175mm Single Flute Spiral End Mill (Superior chip evacuation; prevents wood burning or scorching).
• Spindle Speed: 13,000 RPM
• Cutting Feed Rate (XY): 800 mm/min
• Plunge Feed Rate (Z): 800 mm/min
• Stepdown (DOC): 1.0 mm (Cutting a 10mm board in 10 passes ensures perfectly vertical and smooth tooth walls).
• Stepover (XY): 2.0 mm
• Cooling & Chip Evacuation: Continuous high-velocity air assist! Evacuating chips promptly eliminates frictional heat build-up inside narrow slots.

CNC Machining: Let the Chips Fly

With parameters locked in, fire up the HiMill D1S! Accompanied by the steady hum of the spindle and the active air assist, the 3.175mm end mill glides precisely across the basswood.

• Gear Cutting: Every single gear tooth is carved out crisp and sharp with zero tear-out—demonstrating the distinct advantage of high-rigidity CNC milling over manual scroll sawing.
• Linkages & Letters: The smooth, cursive "open/closed" lettering and pivot linkages are routed with exact dimensional repeatability.

Painting, Assembly & Mechanical Tuning

Once parts are cut, a high-contrast black-and-white finish emphasizes the mechanical depth and layering.

1. Deburring: Use 400-grit fine sandpaper to lightly smooth all edges, paying close attention to gear teeth flanks.
2. Spray Finishing:
   • Base & Gears: Spray-painted matte black to resemble vintage cast-iron machinery while concealing underlying linkages.
   • Lettering ("open/closed"): Spray-painted gloss white to deliver punchy visual contrast and instant readability.
3. Mechanical Assembly: Seat the gears onto the base, press in the miniature bearings, and insert the dowel shafts. All gears mesh seamlessly with zero slop or binding. A flick of the outer drive gear spins the entire linkage system with buttery-smooth mechanical satisfaction!

The Final Showcase

Placed at your storefront or on your desk, this sign is an irresistible conversation starter. Every flip is more than a status change—it is an interactive piece of mechanical art.

Transforming flat sheet stock into dynamic 3D mechanical motion showcases the rigidity, accuracy, and versatility of the HiMill D1S Desktop Machining Center.