Vacuum chucks reduce disk distortion
A
TechMetric product story
Edited by the Engineeringtalk editorial team
Sep 23, 2002
Available now from TechMetric is a range of patent-pending media and mechanical chucks.
Available now from TechMetric is a range of patent-pending media and mechanical chucks.
First developed for process improvement in the disk drive industry, these chucks have no mechanical clamping components resulting in the elimination of additional inertial clamping forces to the disk, dramatically minimising disk distortion.
TechMetric's novel vacuum delivery system minimises disk distortion.
The larger grooves with larger vacuum ports, result in very even distribution of clamping forces.
The company's line of pure vacuum chucks have no mechanical clamping components.
This results in the application of no additional inertial clamping forces to the disk.
Pure vacuum chucks are ideal for plastic substrates.
Also available are vacuum/mechanical chucks that combine vacuum with mechanical clamping components.
This provides sufficient clamping forces to prevent start-up disk slippage.
The counter balanced clamping components prevent an increase in clamping forces as speed is increased.
Mechanical chucks centre the disks dynamically.
They are not sensitive to variations in disk bore diameter.
This results in consistent high concentricity's and repeatable disk location.
Mechanical chucks also allow testing to be done at a smaller radius than vacuum chucks.
There is no sacrifice of clamping force for this radius reduction.
TechMetric's one-piece design reduces potential operator assembly errors.
These errors result in: irregular parallelism; increased run-out; potential envelope deviation; and rejection of good media.
All TechMetric chucks have less than 25 millionths parallelism built in, and may be "dialed-in" to achieve extremely high concentricities.
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