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Linear slide for cutting edge positioning accuracy

11 December 2017

LG Motion’s UniSlide linear slide brings cutting edge positioning accuracy to the most exacting applications.

What does UniSlide offer?

If you need precise, versatile movement in one, two or three dimensions a UniSlide linear slide which can be used as a manual or motorised unit provides a simple and versatile solution.

Design features

A unique rigid dovetail design manufactured in a light weight high-strength aluminium alloy, UniSlide is corrosion resistant, can withstand impact loads and is non-magnetic. It is suitable for use in vacuum, 10-6 torr. Being modular in design it is especially suitable for multi-axis combinations.

Low friction polymer bearings are fitted to the slider to ensure maintenance free long life. The dovetail surfaces are precision machined and lapped. Customising options are available, and delivery of the product is usually within one week.

Turbo fan engine maintenance application

For maximum efficiency of an aircraft turbo fan engine the gap between the tip of the fan blades and the engine inner surface must be an optimum. Through normal wear and tear and as a consequence of repeated heavy landings when the engine might become distorted in shape, the tip of the blades can come into contact with the inner surface thus making the gap excessively large or irregular.

Until now the inner surface of the engine had to be machined out, refitted and reground by hand, relying heavily upon the expertise and experience of the operator to achieve the right finish. Rather like filling and machining out dents in car bodies.  For the aircraft operator this part of the maintenance programme is both costly and time consuming.

The solution

To improve this process a number of assemblies have been designed and constructed which contain customised linear slides from LG Motion which are able to meet the exacting space and performance requirements for this challenging application. The equipment can be deployed in engines while still mounted on the aircraft, following removal of the blades. Now the new inner surface can be machined using the engine rotor while turned manually. This new process allows a considerable amount of time and cost to be saved.

The complete assembly comprises of a spindle motor with a grinding tool mounted on a servo-controlled leadscrew arrangement that allows the grinding tool to be controlled in the Y and Z directions. Using the engine rotor eliminates any problems of eccentricity and both the cutting depth and position can be precisely determined and maintained.

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