Hi nice job on the gear. Looking closely it looks like you did the outer cut in two passes? Can I see a bit of a lip going on there; are you loosing steps or could it be a bit of backlash?
Just out of interest how did you hold the material down to the table?
As for cutting wood; imo a variable speed router is a must or you will get burning issues and reduces tool life.
Where to get a spindle from; I will leave that for members on your side of the pond.