Hi
i have aluminium Rail to CNC machine ,ok i really bad machinist and lack of time
Material was 6061-T6 or similar
this need <1mm end mill for make the 2 grove
the 8.7mm surface need to be as flat/scare as possible (+/-0.01mm)
rail was 30cm long
end use ..
a pair of rail +spacer will hold a 0.8mm think paper tape into the 1mm notch
Best regard