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CNC template · Learning

Fraction circles

Preview of the CNC template “Fraction circles”

Six circles divided into wholes, halves, thirds, quarters, sixths and eighths, each piece engraved with its fraction, plus a tray with recesses.

Size
279 × 374 mm, 6 mm thick
Material
Plywood
Difficulty
Beginner
Milling time
approx. 37 min
Bits
End mill Ø 6 mm, 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

QtyPart
1Wood paints or acrylic paints

Also: sandpaper (grit 120 and 240), a utility knife or fine saw and, for joints, a rubber mallet.

Carving and finishing

  1. Clamp the workpiece flat on the spoilboard or secure it with double-sided tape, and set the origin as shown in the carving assistant.
  2. Clear the recesses of the tray 2.5 mm deep, engrave the fractions, then cut out the tray and the circle pieces.
  3. Free the parts at the holding tabs with a utility knife or fine saw and sand the tab remains flush.
  4. Lightly break the edges with sandpaper (grit 120, then 240) and remove burrs.

Assembly and final touches

  1. Paint each circle in its own colour; then you see at once that two quarters are as big as one half.
  2. Ideas: Which pieces make a whole together? How many eighths fit into a third? The recesses show whether it adds up exactly.

How to carve this template

  1. OpenOpen the template in the app and adjust size and text if you like.
  2. CheckLook at it in 3D, check run time and warnings.
  3. Set upThe carve wizard guides you through material, clamping, bit and zero point.
  4. CarvePress start; the app drives your Grbl router directly over USB.