Cutting threads for the laserbench of the Michelson-Interferometer which we will use to measure the (hopefully existing) forces of our Baby EMdrive.
I am using a 12mm ALU plate as base. A laser will be splitted into two beams which will be mixed together later. Interference occurs which can show displacements of a few nanometers.
More explanation follows in a video as soon as the bench is ready.