Milling head/spindle completed
The milling head is assembled and ready to be attached to the column. The pictures below show the parts. Just the frame, a collet holder, the pulley, and two bearings. The bearings are just radial ball bearings. I thought about using angular contact bearings, but the local bearing supplier recommended these ones. Since the intended use will not exert any axial forces, I hope they will be sufficient. If not, I will replace them with more suitable ones.
And this is the vise that the milling head will be mounted to. I have no idea what it was originally used for, but it is extremely well made to close tolerances.