Reliable circular motion from guide assembly
A
THK UK product story
Edited by the Engineeringtalk editorial team
Dec 6, 2006
In a liquid crystal display evaluation machine, THK's HCR-series circular guides are playing a key role by enabling very precise positioning of the sensor
Linear motion guides from THK continue to provide convenient and cost-effective solutions in a wide range of scientific and metrology applications.
In a liquid crystal display (LCD) evaluation machine, which accurately measures how the optical characteristics of the LCDs vary with viewing angle, HCR-series circular guides are playing a key role by enabling very precise positioning of the sensor used to make the measurements.
HCR guides, which use the same technology as THK's linear guides, are supplied as a complete ready-to-install assembly, eliminating the need for the complex multi-component mechanisms often used to produce circular motion.
In this application, the rigidity of the HCR guides is a particular benefit in allowing the necessary levels of accuracy to be achieved, as is their freedom from differential slip.
The LCD evaluation machine also uses type RSR12 guides for X/Y positioning of the LCDs, which can be as large as 60in.
across the diagonal.
Even though the machine performs tests under modified climatic conditions, the accuracy and performance of the THK guides are unaffected.
The latest linear motion guides feature THK's industry-leading Caged Ball technology, which completely eliminates ball-to-ball contact while ensuring effective lubricant retention.
The result is exceptionally low friction and minimal maintenance requirements.
THK type SSR20 linear guides were the choice for another machine which scans and measures 2D objects for quality control purposes and to generate CAD data automatically.
The low and constant dynamic friction of the guides, which are used for the X (scanning) axis, and their very low starting torque requirements were important benefits.
In the same machine, GL actuators are used for the Z-axis where longer travel, combined with fast motion, is required.
Since the GL actuators are part of an assembly that moves during the scanning process, their low mass and compact construction were also beneficial.
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