A comparison of defects produced on oxidation of carbon nanotubes by acid and UV ozone treatment

A keyway is cut in a shaft by means of a cutting unit moved along a guideway on a base that is clamped on the shaft. The cutting unit has a milling head that is slimmer than the desired keyway. The keyway is cut in more than one sweep and the transverse position of the cutting unit is adjusted between the sweeps. In this way, narrow and wide keyways can be cut with the same precision and with one and the same comparatively small machine.