Yes, you can see the difference between Tersa and spiral. You can easily go from planer directly to 150-180 (my final grit when using hardwax)
with spiral I had to go down to 80-100 to remove some minor milling marks.?
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60 gallon can handle it, it depends on how frequent you are willing to empty it. I can easily fill a 35 gallon in a single milling operation.
