Thanks for the feedback voicecoil, lots of talent on this site. When you said you were drilling I assumed a steel gantry because of the twisting issue, but what do I know. Yes I believe MK4 would be able to do it but I'm starting to think about the speeds I would sacrifice for other operations. I'm thinking about building a gantry across my fabrication table and doing some z axis experiments. Do you know of any practical guides on the torque delivery for various components, steppers, ball screws etc...?