Slide Table

Machine tool slide tables are usually used for heavy-duty applications such as CNC machining machines, automated assembly machines, tooling and cutting, and are capable of handling large loads. These motorized linear slide tables provide precise mobility capabilities that can be single, double, or multi-axis around vertical or horizontal tracks. 

Drive mechanisms shift computer slide tables; such mechanisms may be electric, hydraulic, or electrical. Computer slides are engineered to have tight tolerances and elevated rigidity to ensure that motion is controlled, even in high-paced applications.

Crossed Roller Slide Table Basics

A lightweight, high-precision high-rigidity, minimal linear guidance device with built-in cross roller guidance is the cross roller slide table. This product offers a high precision linear guidance system that is conveniently assembled with bolts. 

The slides consist of a stationary base that carries the linear rails and a traveling part, or carriage, that is connected to the channels of the bearings and travels within the railings around the cylindrical or ball bearing slides. 

For their high precision and excellent load-carrying capability, crossed roller tables are renowned. Linear bearing crossed rollers are available in both aluminum and steel for applications where these requirements need to be met, and are the best choice.

There are aluminum crossed roller slide tables with both inch and metric mounting holes open. You may select a rail configuration or go for a design with 4 rails. These are usually available with stainless steel crossed roller rails and roller cages for applications in which corrosion resistance is a requirement. 

For vertical applications or applications involving high acceleration or deceleration powers, you would like to consider advanced custom crossed roller slide tables that can withstand cage creep. Because of load orientations or acceleration forces, these linear bearing units use a rail and roller cage configuration that prevents roller cage migration or slippage.

Crossed Roller Slide Tables vs. Ball Bearing Slide Tables

When referring to linear bearings used with slide tables, we usually think of devices that combine ball bearings, implying that by recirculating balls, friction is minimized between moving objects. Recirculating ball bearings are usually integrated into bushings, ball splines, linear leads, and slides. 

However as technology has become more demanding and demands greater accuracy, reliance on another form of linear bearing, the crossed roller, has increased drastically. In a wide variety of uses, from surgical and research devices, machine tools, semiconductor and electronics processing, clean rooms and vacuum conditions, material storage, eye inspection, robots, and automation machines, crossed roller bearings can be found.

Better precision, rigidity, and weight-bearing capability for linear motion slide tables compared to other widely used friction-reducing devices such as ball bearings are determined by crossed roller bearings. And unlike ball bearings, moment loads, radial forces or tilting loads may be borne by them. This allows more than one ball bearing to be replaced by one crossed roller bearing, thereby saving the space needed by ball bearings, reducing the related cost of the material.

How to prevent cage creep with slide tables?

When selecting a crossed roller slide table, a phenomenon called cage creep is an important factor. Since the cage floats between the rails of the bearing, it can drift over time from its longitudinal base, especially in applications where the slide is vertically mounted or where only partial strokes are created by the linear bearing. Cage creep may also be caused by vibrations and shock. The cage will reduce slide travel as creep happens, and once the bearing reaches its next complete stroke, an off-center cage meets a rail endstop and is forced to skid, centering itself again. 

The retainer, rollers, and slideway of slide tables can be harmed by touching the end-stop and skidding. Cage creep also suggests that the rollers do not roll but slide and cause metal-to-metal scratching, contributing to wear. There is some good news, though. There are anti-creep systems that prevent retainers from slipping by holding the rollers between the two V-grooved slideway rails. Therefore, any mounting direction is available for applying the rails. Anti-creep systems often reduce downtime and the burden of repairs.

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