1250 x 1250 cnc router (from scratch)

[Danielroyal25]

Thanks for the reply / info.
just working on the CAD model now so will hopefully have a few images up here soon for everyone to give their input.
I have decided to go with two rails on the x driven by 1x motor via toothed belt. I have read a few more posts and learnt tons more and have seen quite a few heated debated over that issue but think the belt will eliminate any room for error as its mechanically sound.
I will have a read up on the controllers, I can see the ads / dis ads of both but I guess i just have to make a decision and stick with it.
Will keep you posted on the progress.

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Got quite a bit done on the model today but still a few bits to do before the pics go online.
Just want to confirm a few things before i progress any more. My shopping list for rails and ball screws are as follows (all lengths TBC):

Ball screws (machined with ball nuts)
X = RM1605 (400mm)
Y = RM1610 (1500mm)
Z = RM1610 (1500mm)

Linear round supported rails (with SBR20/25UU bearings)
X = SBR25 (1500mm)
Y = SBR20 (1500mm)
Z = SBR20 (400mm)

Looking at getting these from the famous ebay guy, does he machine the ball screws to accept pulleys to or just couplers? can the length machined for couplers be used for pulleys? has anyone used pulleys from cnc4you or does everyone generally use HTD pulleys?

On the X and Y's is it best to have BK15 bearings on both ends of the ball screws for extra support and BF and Bk on the Z or will BF and BK's all round be ok?

I was looking at using dia 20mm ball screws originally but after reading posts on here, will probably go with 16's.
As feed rates and resolution are always discussed regarding ball screw size is it just down to what the machine is used for, as to what to go with. Are the 16's a good all rounder for both?