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CNC template · Technology and experiments

Marble run tiles

Preview of the CNC template “Marble run tiles”

Six tiles with carved channels: start, straight, curve, crossing, junction and finish. Lay them on a slightly tilted board to build ever new runs; size and marble adjustable.

Size
280 × 188 mm, 18 mm thick
Material
Hardwood (beech, oak)
Difficulty
Beginner
Milling time
approx. 28 min
Bits
End mill Ø 6 mm, End mill Ø 6 mm
Customise
Size, text and details adjustable with sliders

Free with an account · carve with Chrome or Edge · no installation

Build instructions

Materials and accessories

QtyPart
6Glass marbles

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 channels with the 6 mm end mill, then cut out the tiles.
  3. Free the parts at the holding tabs with a utility knife or fine saw and sand the tab remains flush.
  4. Break the channel edges with sandpaper so the marbles do not catch at the joins.

Assembly and final touches

  1. Tilt a large board or tray by 3 to 5 degrees (a book under one side), lay the tiles edge to edge on it and release the marble at the start.
  2. Experiment: how steep must the board be for the marble to get round the curve? How does the time to the finish change?
  3. Finally oil, wax or varnish; for toys use oils or varnishes that are saliva-resistant according to EN 71-3.

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.