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Hi all, thanks and sorry for late answer. ChrisB I spent some time trying to have a better Z axis dovetail ... I replaced original gib with a brass one. usually i close the Z gib before milling. I changed end mill, now I use a 4 flutes, reduce a little the speed and decrease the feeding...

I bought a 2nd hand X2 like machine, add a spring air and some digital readouts ... I try to cut steel low carbon using an 8mm slot mill. 1000 RPMS , 0.4 mm cutting deep and just a 1.5 mm/s feeding. results: ... chatter, vibration, poor surface .... Is 0.045 mm/theet-revolution too much for...