LINEAR MOTION

Nuts use ‘active cam’ to hold stiffness

Machine performance for linear motion requirements has been hampered in the past by inadequate nut design, according to supplier Abssac. That is about to change, the company says, with a new range of lead screw nuts from US maker Ball Screws & Actuators.

The XCT and XCF nuts have a patented ‘active cam’ design which eliminates backlash, maintains a high axial sitffness and reduces drag friction. Nuts, with integral flange or thread mounting, fit screw diameters from 5/16-1/2 and equivalent metric sizes.

ABSSAC

Wyko Industrial Distribution is using NSK-RHP ball screws and linear guides to provide micron-level positioning on X-Y tables used for precision slicing of silicon wafers. The screws have been fitted to sawing machines developed by Logitech in Glasgow. Unusually, these combine annular slicing and peripheral cutting on one machine.

Table positioning accuracies are 7.5 m in the X axis and 5 m in the Y axis. Each axis is driven by an NSK-RHP ballscrew supported by two LU series linear guides, for high stiffness and low friction.

The APD machine, which has a 100mm2 cutting envelope, can also section and cut electronic parts, a range of glasses, ceramics and electro-optic materials.

NSK-RHP

Micrometre-tolerance linear ball bushings from Nadella UK are aimed at precision applications in tool and jig manufacture, injection moulding machines, robotics and instrumentation. They are part of a range of linear motion systems from Swiss company Sferax.

NADELLA UK