First I was going to go with 1/2 acme. After a couple weeks I decided to go with ballscrews. I bought a single nut SKF 10mm system. What kind of accuracy am I to expect with this?

Typically, if its precision ground the error is around .0005/ft or less . If it is precision rolled, around .004/ft. The thing to watch with a single nut is backlash, The best is a preloaded nut but these put the price up quite a bit.
Al

http://www.linearmotion.skf.com/Catalog/datasheet_drawing2.asp?PN=SH+10+x+3R&FAM=MiniatureRolledScr&P=13943,13955&Lang=EN

It's a non preload rolled. Yes yes, I know this is the lower end of ballscrews, but is it going to have decent precision?

I actually just got done making a very small first run try at a 3 axis machine. Bearings and screws seemed to work wonderfully. I now have a pair of bearings and screws which may work good for you. They are 37 inch long 1" dia , 4 turns per inch,route

Maybe you would like to take a look . I have posted all the information that I thought I needed to use them. But it was just going to be to big of a project.

Item number: 3804800919

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3804800919

Would you be willing to end the auction early? If so, how much would it be including shipping?

I couldn't resist to put my little bid in for these...,:)

Those are nice! Do you have any others that you are offering?

but is it going to have decent precision?

It should be at least as precise as the 1/2-10 acme, but if I'm reading it right, it looks like it has up to .07mm backlash. You don't really want any backlash if you can avoid it.

Gerry

Well, that's only around 3 thou backlash. I can easily live with that.

Do not use these screws unless you plan on using LARGE steppers or servos. Also you will need some sort of reduction.

Nice looking lead screws.

E

Ok, I'll just stick to my single nut Skf ones for now. Thanks!