Linear bearing upgrade options?

[Joe]

Yes the enclosure is a good thing to have, the machine and all its electronics are in the enclosure and then I have storage space in the bottom.

I cut mainly aluminum, plastics, modelling foam and wood, a real mixture really . It can machine steel but I try to avoid it when I can.

all the ball screws are 1605 from linearmotionbearings and they seam accurate but I can get up to 0.09mm of "backlash" or flex when I push and pull on the machine, but the accuracy/repeatability of actual parts is more like 0.03mm which is really good. I am thinking of upgrading to a branded 20mm screw which should give me a bit more rigidity.

[Jonathan]

all the ball screws are 1605 from linearmotionbearings and they seam accurate but I can get up to 0.09mm of "backlash" or flex when I push and pull on the machine

If you actually mean backlash, then 0.09mm is a sign of the ballscrews being damaged, however it sounds like you mean flex in the machine? If that's the case then better rails is one way to help with that.

I am thinking of upgrading to a branded 20mm screw which should give me a bit more rigidity.

You don't need a larger diameter screw - it will only slow things down. The load rating and stiffness of 16mm ballscrews is plenty for the size of your machine.

[Joe]

Yes I don't mean backlash as such I mean machine flex around the screw , so cumulative error between the screw support, ballnut and housing ect.

I wasnt sure about a larger screw and if it would actually improve things, but your right the extra mass will definitely kill acceleration.