No image showing.We occasionally get posts from somebody wanting to build a machine with a huge Z travel and I normally make the point that it does not mean that you will be able to cut absolutely any shape that is less tall than the Z travel.I recommend that you create a model of your proposed spindle and then consider how much of a limitation it will be to have the Z axis backplate and the spindle body extending beyond the diameter of the tool.

Attachment 501702