Re: : linear bearing based on ground flat stock

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Fred Smith" <imserv@...> wrote:

> V-track rail systems use opposing rollers. There is a preload
> between the opposing rollers to prevent the roller from riding up on
> the sides of the rail angles. With a preload, there is little or no
> twisting of the trolley and it becomes very stable ( 4 total rollers
> and two parallel tracks). Connect two trolleys with a beam to
> create a gantry, or use one alone for a hexapod strut.
>
> Fred Smith

He was suggesting two rollers are enough.

Graham