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Hi unclescrooge! The CNC design is great, and I'd like to repeat it, but I'm afraid of aluminium rails - because aluminium is quite soft material and may wear out. After 4 months, how do they perform, and how many details you made at this CNS router?
Here is a schematic and scetch for a battery tester using Nokia LCD display: http://lazyelectronics.com/index.php/en/item/3-battester-en