I think they are phenolite (browny redish colour). but I would have to remake the whole gear box as each meshing pair is made up of a metal and a plastic gear. Its mainly the gear I filed that is noisy but as that is in the chain for three of the speeds then its a bit of a problem.

I only wanted to get it working so the machine was complete if I decided to sell it in the future. I think belt drive will be much smoother as the notchy/cogging could be transferred to the tool tip and leave marks in the finish.