Originally Posted by cnczoner  I see single-nuts, double nuts and pre-loaded nuts, but not sure what this is. Single-nut seems straightforward, double-nut seems like 2 nuts that should be tensioned against each other, but I don't see any mechanism for tensioning. Or is that internal somewhere? Also what is pre-loaded? Does that mean that the balls are pre-loaded into the nut? Or that there is some pre-load tension on the ballnut mechanism? |
In my opinion, for CNC applications some kind of preload is necessary, this can vary from sizing the balls for minimum backlash , or my preference is preloaded nut, this is usually done with two nuts and something that resembles two belville washers to load one against the other and for a pretermined preload force, usually published by the manuf.
Rolled is obviously cheaper than the precision ground and I have found vary in quality, the bulk ones sold on the auction site here and ebay, are very good quality precision rolled from N. Korean Hiwin, dia is a bit small though 20mm.
Al.