Not quite a new member but...

[CharlieRam]

Resolution is still more than enough for cutting aluminium unless your wanting to cut very high detail, in which case your probably building the wrong design of machine anyway.!

What kind of tolerance's would I expect to achieve with hiwin rails and 2010 ballscrews and would it be much worse with supported round rails and what kind of machine should I be building if I want precision?
Cheers, Charlie

[JAZZCNC]

What kind of tolerance's would I expect to achieve with hiwin rails and 2010 ballscrews and would it be much worse with supported round rails and what kind of machine should I be building if I want precision?
Cheers, Charlie

Can't honestly answer that question because there's far more too tolerence than just the screws or rails you use.! Machine Design and build quality all play big part in this. I can tell you cheap chinese round rail is far inferior to profiled linear rail so if your chasing high tolerences then forget round rail.
Also If your on a budget then Chai at linear motion bearings is now selling Profiled linear rail at very good prices which makes using round type pointless. I've used loads now and they are good for the money. Not quite Hiwin quality but much cheaper and not far behind.

If you need high tolerences then you need a very ridged and stiff machine in which case provided the size required isn't huge then a fixed gantry machine is much better design.

[CharlieRam]

Ive had a look on chai's ebay.com shop, Ebay.co.uk shows nothing in his shop for some reason but even on the us site all I can see is supported round rail, no profile rails at all? does he have a shop other than ebay?
Thanks, Charlie

[JAZZCNC]

Ive had a look on chai's ebay.com shop, Ebay.co.uk shows nothing in his shop for some reason but even on the us site all I can see is supported round rail, no profile rails at all? does he have a shop other than ebay?
Thanks, Charlie

I don't deal with him thru ebay I deal direct. Have no fear doing this with Chai he's 100% ok to deal with and trust. I'll PM you is Email address just send him an email for a quote.