New milling motor Proxxon FBS 240/E upgrade to Kress 1050 FME-1

[Chaz]

Thanks, looks like small cutters and solid carbide are the way forwards. HP does not really factor until you get up in the 10mm dia range and a 10mm carbide tool is quite spendy. But at that size machine rigidity would be a serious factor so conservatively I would guess that carbide cutters <5mm dia are the order of the day for aluminium.

Good calculator in that link BTW

Ye, very good as a starting point.

Stick to 2 flute for alu, my 'favorite' sizes are 8mm roughing, 6 and 10mm for finishing, 4mm for smaller if needed.