My baby 15" x 15" machine

[Hobgoblin]

Hmm before going to his shop I would of assumed so, but now looking at this: 3 SBR16 set+3 ballscrews RM1605+3 BK/BF12 +3 couplering | eBay Im not so sure.

Id suggest either wait for someone who has ordered from chai to post, or email chai direct and explain what you need. Im in this process at the moment and he is nothing but helpful.

[Jonathan]

It's hard to give a definitive answer as it depends on so many factors, what you need to cut and how often, how fast, required accuracy, personal preference... etc
It's borderline, you'd probably get away with one screw as the distance between the bearing blocks is fairly small, but if you're going to be cutting metals at all regularly or just generally want to be able to cut at a good material removal rate accurately then get two ball-screws. You certainly wont regret it.