Gantry style CNC mill

[JAZZCNC]

A question pops to my mind. Looking at the type of structure. WHY BT30 head?

IMHO you limit severely your machine with this BT30 spindle. Its like driving a big black 4x4 near the seaside on a perfect road, while you must be driving a white cabrio sports car...

Don't talk stupid. I'd rather have BT 30 spindle with option of ATC than 3Kw ER spindle anyday of the week. However what it really needs are high rpm rated bearings which can be replaced if needed.

Because from the looks that's not a machine for steel for me and i can not be easily convinced that it will be with that aluminum profiles.

Why do you doubt Profile.? Your machine is made from mild steel tube which very similiar in density to Aluminium profile but it's it's hollow so much more resonant which is bad news if trying to cut hard materials like steel.

Can tell you know I'd much rather have Gantry made from HD profile than from thin/medium wall Mild steel box section. Unless that box section was minimum of 10mm thick wall which then opens up all lot of other issues regards Mass etc.

Just because it's made from steel doesn't always make it better or stronger.