if want longer than they do it better to go for rack and pinion for that length over belt, depending what price my project is I might but this just to make aluminium parts to build a 4 by 8 work space machine, looking at RCNCX2 on youtube but can get similar for about half the price but not sure on them as not look as strong
you are limited by cutter length, there a balance between rpm and feed rate on materials, just know have to lower feed if cut deeper but most do 5 or 10mm max per pass I think, also leave like 1 mm left if leaving a surface as that be to use as to make best finish normally
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