Ok. I understand.

The example you gave is "perfect" example of crappy machine with good marketing. In fact i have something quite similar and i bought it because there was no body to help then and explain me that:
All cheap systems of linear movement are crap and only the square supported rail is the real thing. So as i said, whatever you do, don't go that way/ v wheels, round rails, etc./ Whatever they say!

So go to ebay or BST Automation and search for supported square rails, Hiwin, chinese or whatever. Just saw that Zapp automation has some great deal on ISEl http://www.zappautomation.co.uk/surplus-stock.html you will need size 20 rails and blocks.


Next you will need to know the ballscrew price more or less, BST Automation

So you decide if its doable or not, just follow the steps from my previous post. Dont start the build until you have the screws, rails and nut housings in your hands.