ISO15 spindle assembly with holders

[fifa]

Hi Suesi

It fits. You need to change holder type. For ATC you need more anyway...

Regarding DIY CNC and ATC - has no sense, unless you are very restricted with space, or you have special needs. Easier is to buy used industrial grade machine (and update the controller if needed). It is also more reliable.
Such I can make one for you. Can be also for steel (mineralcast).

I have seen a lot of cheap ATC spindles. Common problem: cheap means small diameter bearings ... Whatever you do stiffness suffer. It is cheaper to buy 2 solid fixed spindle motor than one reasonable good ATC (depends also on Max RPM)

For RPM up to 12.000 : buy an old low profile motor for circular saw with 2" (or at least 50 mm) bearings. With investment of ca 1000 GBP (bearings and machining), - you will get a 15 Nm milling spindle with ATC capability (prices started at 7000 +).

regards

martin