Thursday, January 14, 2010

Linear-Rail System Has Self-Adjusting Mechanism

The SBI range from Jena Tec offers low noise and high rigidity, coupled with a smooth movement and self-adjusting mechanism. According to the company, an increase of load-carrying capacities of up to 40 per cent can be achieved compared to standard block and rail systems. Compared to conventional linear rail cross sections, the SBI range is approximately 10 per cent lower, with a wider through section of nearly 20 per cent, Jena said.

Its improved lower cross-sectional centre point offers greater structural rigidity, improved straightness during manufacturing and straightness in application. Heat treated to HRC60, the SBI range is highly stable, while shorter cross-sectional areas mean grinding time and plastic deformation are reduced. Linear blocks are constructed from a hardened-steel rigid structure with the same lower cross-section centre as the rail and slightly longer block length meaning a greater number of balls with a smooth circular-angular motion.

This improved track profile and angle results in a smoother and quieter operation. Standard across the range of SBC products is the heat- and chemical-resistant end plate with moulded return systems and a self-aligning design to ensure the end plate is correctly fitted in line with the main steel block. Despite an increased load-carrying capability, the additional length attributable to the SBI range is approximately only 3-4mm longer than standard types, dependant on carriage model, which is made possible by an improved end-plate design.

Upper and bottom retainer plates fitted to each block ensure that loose steel balls are eliminated, as well as skidding and poor rolling performance within the load zone, preventing ingress of foreign substances. The SBI retainers are snap assembled and self aligning. The moulded return plate contributes to the smooth running operation of the SBC range, as well as keeping running noise low. The SBI range achieves this through an improved contact angle of 52 per cent, versus the industry standard of 53 per cent.

The lower radius of curvature provides a broader contact surface compared to the relevant ball size possible and therefore improves the rigidity. The improved angular ball recirculation system with four-row, two-point contact and 45deg angular orientation ensures that rolling performance is maintained with low noise at all grades of pre-load.

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