Originally Posted by
routalot
My reaction is that if you are seeking the challenge of building a machine,you have made a start on the process.There will need to be several more iterations before the design is able to meet your expectations.Did you calculate the force that the leadscrews will generate for the motors you wish to use?I have doubts that the construction you are proposing will maintain is shape under even a quarter of that load.Additionally,high speed machining of aluminium is a specialised field-do you have experience of it?
If the intention is to make components,rather than the intellectual challenge of machine building,I suggest you buy a benchtop mill and equip it with steppers as the machine will have the rigidity and will have been made fairly accurately.If you were to really go to town and add ballscrews,it could be a very useful thing to have.With the advantage that you could use the machine in manual mode to make the brackets and other parts you might need.