"Superior type" ballscrew end bearings

[magicniner]

Just visit a decent Industrial Bearing Supplier and tell them what you need, generally you get better products at a fraction of the online prices!

[Boyan Silyavski]

I used that setup on both sides of my screws and was very happy from it. I don't see the point of using floating end on a properly made CNC, given the small price to pay.

[Voicecoil]

So am I right in thinking that this kind of setup is essentially working like having fixed bearings at both ends? - there's an obvious advantage in reducing "whipping" at high speeds that way. Would some preload help even further, or does "just-and-so tight" sort most of it?

[Cube3]

https://www.linearmotiontips.com/cho...-applications/

Be careful of thermal expansion on Fixed/Fixed long leadscrews.

Regards
Simon

[Voicecoil]

Thanks for the link. It sounds like Fred is offering the "double floating" variety of bearing then.

Another thing that struck me today was that (if you have space for them) having 2 "floating bearings" spaced a bit apart ought to resist whipping, whilst not giving any problems due to thermal expansion. The thermal expansion thing I guess will only be a major problem on machines made from dissimilar metals anyway e.g. aluminium frame with steel ballscrews. I was quite suprised how much it could be when I did the sums for my design, about 0.5mm for a 1700mm long machine with a 20 degree C change.