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CNC template · Technology and experiments
Sundial for your latitude
Horizontal sundial with calculated hour lines from 6 to 18 o’clock and a slot-in gnomon at the angle of your latitude. For the garden, a windowsill or the classroom.
- Size
- 338 × 216 mm, 6 mm thick
- Material
- Plywood
- Difficulty
- Intermediate
- Milling time
- approx. 14 min
- Bits
- V-bit 60°, End mill Ø 3.175 mm
- Customise
- Size, text and details adjustable with sliders
- With a laser
- diode laser from about 10 W (cuts 6 mm)
Try it without an account · carve with Chrome or Edge · no installation
Build instructions
Materials and accessories
| Qty | Part |
|---|---|
| 1 | Wood glue (water-resistant D3) |
| 1 | Wood oil, wax or clear varnish |
Also: sandpaper (grit 120 and 240), a utility knife or fine saw and, for joints, a rubber mallet.
Carving and finishing
- Clamp the workpiece flat on the spoilboard or secure it with double-sided tape, and set the origin as shown in the carving assistant.
- Engrave hour lines and numbers, carve the slot, then cut out the dial and gnomon. Set the latitude of your location first (Hamburg 53.5°, Berlin 52.5°, Cologne 51°, Munich 48°, Zurich 47.5°).
- Free the parts at the holding tabs with a utility knife or fine saw and sand the tab remains flush.
- Before gluing, dry-fit everything. If a joint is too tight, increase the clearance by 0.05 mm and carve the part again; if it wobbles, reduce it.
Assembly and final touches
- Glue the gnomon into the slot with its tip pointing south; it must stand exactly vertical.
- Set the dial level (spirit level) and turn the centre line exactly north: at true noon (in Central Europe around 12:10 to 12:40 standard time, depending on location) the shadow falls on the 12.
- The dial shows local apparent time. For clock time: add 1 hour in summer; west of 15° east add 4 minutes per degree of longitude; over the year it also varies by up to 16 minutes (equation of time). For outdoors use hardwood or acrylic and varnish it.
How to carve this template
- OpenOpen the template in the app and adjust size and text if you like.
- CheckLook at it in 3D, check run time and warnings.
- Set upThe carve wizard guides you through material, clamping, bit and zero point.
- CarvePress start; the app drives your Grbl router directly over USB.
