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19-01-2009 #8
I could be wrong, but I've always thought of CNC routers as tools for making pretties where a slight lack of precision is a minor problem easily fixed with sand paper.
When the tool cuts everything starts to bend. If you want to limit the bending to match your tolerance you can either make incredibly fine finishing cuts and production time goes through the roof, or, you buy a much heavier machine from the word go.
I was looking at a budget mill on ebay, the spec looked good until I noticed it only weighed 120kg
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