Linear systems

Linear systems

The linear systems generally consist of two units, namely a guideway and a slide onto which the component to be driven is built. They are used to ensure linear movements with utmost precision and minimum friction, in relation to the load to be carried and to the requested performances, in terms of speed and acceleration.

The rolling elements may vary: balls, rollers, needle rollers, with or without containment cages. Systems that envisage contact by sliding rather than by rolling can be fulfilled. The choice of the most suitable linear system, for each given application, shall take all the parameters involved for each single application into consideration, namely: entity, direction and method of the load applied (along work routes, approach and any pauses), kinematic variables related to motion (speed and acceleration, with relevant graphs of their trend based on the space, work cycles and their temporal frequency) and requested precision in terms of repeatability and geometry.

There are different types that depend on the constructional SHAPE, the ROLLING ELEMENTS, the type of GUIDEWAY and the MOBILE ELEMENT. Here’s the classification:

Guide shape Type Rolling elements Containment Mobile element
 Profiled Recirculating Ball None/Cage Linear bearing unit
Rollers None Linear bearing unit
Flat Recirculating Rollers None Linear bearing unit
Traversing Rollers (Needle) Cage Guide
With track rollers on profiles Recirculating Balls Cage Slide
On shafts Recirculating Balls Cage Sleeve
Sliding None None Sleeve
The categories of screws and actuators are the following:


Bar finish T-nuts
Rolled Cylindrical, Smooth
Cylindrical, Threaded
Flanged, Single

Cylindrical, Smooth
Flanged, Single
Flanged, Double


Type Guidance system
Belt actuator  With track rollers
Will ball bearings
Screw actuator Will ball bearings
Table Will ball bearings

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