Chips, that does pose a bit of a problem. Your steppers are rated up too 16-in-lb's but they will not get ANYWHERE near there w/ the lower voltages of the Xylotex power supply [I don't think anyway..]. Can you tell me what your nameplate spec's are for your stepper [ Voltage and amp's] I'm guessing thats a Nema 23 motor? [256 oz-in max] If you have the make/model that might help as well as I can go to the website [possibly] and get power charts from there also!
Now, w/ more knowledge comes more questions
If its a fixed gantry the weight doesn't matter, what is the weight of your table[ the moving part]??
Also, in your first post you'd stated a ballscrew and then in the last post a Acme thread can you clarify which one?
If your cutting MDF then the tool forces are very low, [you can imagine how much force it takes to operate a router in mdf by hand [ not very much
]
Sorry to pose more questions but until the fact's are known its a bit tough to 'tell' anything. It's kinda like looking at a race car and telling someone exactly how fast it goes or how much HP it has w/out even knowing what engine is in the car. It wouldn't be to terribly accurate. Not that you should expect I can work miracles and will have the exact performance spec's from your router either
I can get close but.. you know what 'close' only counts in right?
Jerry