"Waveguide" Bedside Reading Lamp cnc

I got some 10 mm acrylic glass (PMMA, a.k.a. plexi glass) from a donor. This material is not super easy to work with on a small cnc, as the chips tend to melt and clog the end mill resulting in breaking the bit. A solution is to reduce the spindle speed, ramp up the feed and make fast shallow passes. Some drops of water mixed with methylated spirits or washing-up liquid help to cool the cutter. However it increases the mess. Especially if you use some compressed air to clean out the cutting channel. The sides but in particular the edges where the light enters and exits should be sanded smooth and polished clear.

The design is based on two principles giving the lamp it's unusual look:
* first the waveguide based on total reflection of light inside a material
* the possibility to bend acrylic glass if it's heated to a certain degree

In order to get a defined curvature I made a (negative)-form out of plywood. After putting the acrylic glass into an oven at approx 170 °C for 10 min