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Theg schrieb: Doug, what sort of cut did you do with the 20mm aluminium? I have spent the last 9 days!!!! trying to machine some relatively simple parts for a friend. my feeds are slow as, solid carbide 4 flute, cutting oil, cooling spray, 0.2mm pass, 4mm bit, HF spindle, etc etc. I have loads of experience, however the v2 840 has rattled its guide bearing loose 5 times now, worn the Y axis lead nuts, loosened the collet...…. no missed steps, no stress on any of the steppers, 37degs C in 24deg weather...….. I`m of the thought this machine is not fit for purpose.... id love for someone to prove me wrong without loads of mods? When the X access or Y axis tensions bolts loosen they cutters grabs the material and because there is zero rigidity it gets exacerbated violently with zero high draw protection. this isn't helped of course by the performance upgrade kit that has SS pins in the ally coupler that simply bend the ally and fall out...….