stiction


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stiction

[′stik·shən]
(mechanics)
Friction that tends to prevent relative motion between two movable parts at their null position.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

stiction

(STatic frICTION) A failure in early hard drives that caused the read/write heads to stick to the platters. The coating on the platter heated up and liquefied and could become gummy when the disk cooled down. Stiction was a problem when the read/write heads always landed on the platter, known as "contact-start-stop" (CSS). Although texturing the platters helped, it impeded making the bit density greater, and texturing only the landing zone created other problems. The solution was to move the slider and read/write head onto a ramp. See load/unload ramp.
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References in periodicals archive ?
Kalrez LS390 has been purpose-designed to overcome these common challenges by providing high hardness properties (Shore A3 88), low stiction, temperature resistance up to 220-degC and outstanding chemical resistance to process chemicals, WFI (water for injection), and SIP and/or CIP processes.
Moreover, accurate models that allow the identification and quantification of stiction are critical for their compensation by means of a model-based control strategy.
* Predict the valve positions by correcting the valve commands using empirically obtained stiction and dead band data.
System identification applied to stiction quantification in industrial control loops: a comparative study, Journal of Process Control 46: 11-23.
As a result, the torsional stiffness [K.sub.[theta]], preload friction torque [T.sub.f], stiction transition velocity v and maximum stiction deformation e are the key modeling parameters.
[T.sub.INT] - clutch shearing torque (in stiction) (Nm)
(5.) Bhushan, B, "Adhesion and Stiction: Mechanisms, Measurement Techniques, and Methods for REDUCTION." J.
A critical point drying process is used to avoid stiction between the parts due to capillary forces (Fig.
Adhesion and stretching were also affected by feature size, with deeper features exhibiting greater stiction and stretching (ref.
Molders, designers, and OEMs are keenly aware of how stick-slip phenomena, or "stiction," can affect the performance of devices such as auto-injectors, injection pens, stop cocks, and safety syringes.
Also at that time, we were mostly concerned with particulate contamination--and indeed cleanroom standards are based on this--but for disk drive manufacturing, other contaminants, particularly organics and ionics, are of major concern and have to be eliminated to prevent corrosion and stiction, the term used to describe when the head sticks to the disk after a period of not being used.
"Instead of counting on Teflon and Formica to provide just the right balance of stiction and friction," he explains, "I decided to start with bearings that move as freely as possible, and then increase the friction in a controlled manner."