drylin® WQ square profile linear guides are useful as floating bearings which compensate for misalignment errors in all directions (+-1 mm) between rails. This includes jamming, which can only otherwise be prevented by time-consuming parallel alignment.
Although drylin® W is a profile rail system, it can compensate for rotational errors around the x-axis. An angle of +/- 7° is possible. This effectively eliminates the problems known to occur when fitting to sheet metal.
When using systems with two parallel rails, one side must be designated as the “fixed” rail, and the opposite side as the “floating” rail.
- promotes smooth gliding performance and maximizes bearing life
- prevents binding caused by parallelism and misalignment errors
- decreases necessary drive force and wear by minimizing friction-forces
- enhances the precision of the system over the bearings’ lifetime
- reduces assembly time and cost
When using maintenance-free drylin® linear bearings, it is important to ensure that the acting forces follow the 2:1 Rule (see drawing). If either the load or the drive force (F) is greater than twice the bearing length (1X), then a binding or interrupted motion may occur.
If the location of the drive force can not be changed, simply increase the distance between the bearings, or create a counterbalance to move the center-of-gravity back within the 2 to 1 ratio.