Hello from Cardiff!

[Jonathan]

I'm guessing this thread silence means you can't see anything wrong with my drawing? :)

Possibly...

Driving the ballscrews via timing belts allows you to change the ratio - ultimately getting a higher feedrate. True it's more expensive, but if you want to use the motors to their full potential I think it's the way to go. You will of course loose a bit of resolution if it is geared up, and vice versa.

You still have the Z-axis bearings mounted to the Y-axis, not the rails. I'm pretty sure that putting them the other way round makes it stronger in general.

The aluminium extrusion should be strong...steel box section should be cheaper for the same strength. Consider putting an aluminum plate on the bed (maybe 10mm thick) to stiffen it up and give a good surface to hold stuff.

(I just typed this 3 times ... first time I accidently clicked close, next two times the cat closed it for me...)

as you've posted in the thread you should be notified when a post is made.

Yeah I'm getting flooded with emails!