Yes I apply a little spray lube to the delrin nuts. I honestly dont know if it helps or not, but certainly doesn't hurt. I have also found that if you apply a dry lubricant to the bearings, it does help quite a bit.
As far as accuracy goes, I haven't really measured it really close. I just know that when I cut a peice at 30", it comes out 30". The machine is more accurate than my tape measure. I'm sure that if I got out the calipers, I might find some varience, but this is woodworking. I have cut quite a few holes in melamine that needed to line up with the bearings, etc and they all work. Up to 16 holes per peice, no alignment issues.
The material itself will move more than the router will be off. I think that is one of the biggest concepts that people need to remember. Wood and wood products will have a tendency to expand and contract quite a bit, so how exact does a machine have to be?
Again, for example, if I cut a 30" piece, it seems to come out 30"
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