MAXMAKE CNC Blog

Still using that ordinary "Open/Closed" sign hanging on your doorknob? Let's give your shop or studio a hardcore mechanical upgrade! Today, I'll be using the HiMill D1S Desktop Machining Center to build a dynamic, high-contrast kinetic gear sign out of basswood. Just a gentle turn of the gear, and the sign smoothly flips from "OPEN" to "CLOSED" via a mechanical linkage. I'm sharing the ultimate fail-proof CNC carving parameters at the end—the full process revealed, holding nothing back!

🌟 I. Project Overview

• Project Name: Kinetic Gear Open/Closed Sign
• Equipment Used: HiMill D1S Desktop CNC
• Mechanism: Gear Transmission + Linkage Flip Structure
• Features: Highly interactive, minimalist industrial black & white style, buttery-smooth gear meshing.
• Difficulty Level: ⭐⭐⭐⭐ (Tests CNC precision, assembly, and tuning)
• Main Material: Premium Thick Basswood Plywood
• Cycle Time: Approx. 5 Hours

🛠️ II. 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:

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

2. Tooling:

• 3.175mm Single Flute Spiral End Mill

💻 III. Core CNC Parameters (Tested & Proven)

The gear profiles and meshing require extreme machine precision. Here are the optimal basswood cutting parameters I dialed in after rigorous testing on the HiMill D1S (Copy these directly!):

• Tool Type: 3.175mm Single Flute Spiral End Mill (Excellent chip evacuation; prevents wood from burning or scorching).
• Spindle Speed: 13,000 RPM
• Cutting Feed Rate (XY): 800 mm/min
• Plunge Feed Rate (Z): 800 mm/min
• Step Down (Depth per pass): 1 mm (Cutting a 10mm board in 10 passes ensures perfectly vertical and smooth edges).
• Stepover (XY): 2 mm
• Cooling / Chip Evacuation: Turn on the air assist! Clearing chips promptly prevents friction heat caused by chip packing in the slots.

⚙️ IV. CNC Machining: Let the Chips Fly

Parameters set, fire up the HiMill D1S! Accompanied by the steady hum of the spindle and the rush of the air assist, the 3.175mm end mill glides precisely across the basswood.

• Gear Cutting: You can clearly see every single gear tooth carved out perfectly with sharp chamfers and absolutely no tear-out. This is the biggest advantage of high-quality CNC machining over manual scroll sawing.
• Linkages & Letters: The smooth, cursive "open/closed" lettering and linkages are also cut out with spot-on accuracy.

🎨 V. Painting, Assembly & Tuning

Once the parts are cut, I opted for a high-contrast black-and-white finish to emphasize the mechanical layering.

1. Deburring: Use 400-grit fine sandpaper to gently smooth all part edges, paying special attention to the gear teeth.
2. Painting:
   • Base & Gears: Spray painted matte black. The deep black hides the complex internal linkages, making it look like a precision cast-iron machine.
   • Lettering ("open/closed"): Spray painted gloss white. This creates a strong visual contrast, making the shop's status instantly readable.
3. Mechanical Assembly: Place the gears onto the base according to the holes and install the shafts and bearings. This step truly showcases the precision of the HiMill D1S—all the gears mesh seamlessly without any slop or binding. Flick the outer drive gear, and the entire linkage system runs buttery smooth!

🎉 VI. Final Showcase

Place this at your storefront or on your desk, and it's guaranteed to be an eye-catcher. Every flip isn't just a status change; it's a playful interaction with mechanical art.

Transforming a flat wooden board into a dynamic 3D mechanical transmission requires not only clever CAD design but also a highly rigid, reliable desktop machining center like the HiMill D1S. Its rigidity and stability perfectly handled the fine profiles of the entire gear train.

Want to make one for your studio? Grab some wood, copy the parameters above, and fire up your machine!