For hard disk drive manufacturers, that means making sure that as much data as possible can be reliably held on the surface of a media disk within the standardised internal packaging. Meanwhile, the operating environment is becoming ever more challenging, as costs are spiralling downwards in this competitive market. Resonance performance, torque ripple and manufacturing costs are being increasingly squeezed.
At Saint-Gobain we are helping manufacturers meet the needs of this changing marketplace by collaborating on their specific requirements.
RENCOL® Tolerance Rings are ideal precision components within a hard disk drive, mounting the bearing assembly or bearing cartridge into the drive efficiently and at a cost-effective price. The customisable components significantly improve resonance and torque ripple performance while providing the ideal balance between high performance and efficient assembly. Constructed from premium grade stainless steel, RENCOL® Tolerance Ring solutions are used in almost 60% of the world's 2.5" and 3.5" hard disk drives.
The rings come with long life built in, solving the problem of wear and damage by staying in place for the life of the drive and enabling optimum performance. That means consumers can be sure they are buying a more reliable hard disk drive at a competitive price.
Saint-Gobain helps HDD designers by designing RENCOL® Tolerance Rings which improve resonance and torque ripple performance when mounting the bearing assembly or bearing cartridge.
Consumers purchasing hard disk drives want ever smaller and more portable packaging. Mounting a bearing assembly or bearing cartridge within a confined space presents hard disk drive manufacturers a significant challenge. In the pursuit of thinner hard drives, Saint-Gobain RENCOL® Tolerance Rings have been developed by our engineers to reduce the size of disk drives whilst delivering optimum performance. That’s why the leading manufacturers of hard disk drives turn to Saint-Gobain.
Reducing manufacturing costs and ultimately, costs for the end user in the hugely competitive global hard disk drive market is crucial. Our engineers understand the price pressures which hard disk drive manufacturers face.
Our tolerance rings accelerate hard disk drive assembly lines to maximise yield and reduce the overall cost of assembly in each and every unit.
Saint-Gobain's RENCOL® Tolerance Ring solution enables a more consistent, straightforward and cost efficient assembly than alternatives such as set screw and adhesive while minimising failure rates.
We work closely with the world's leading Hard Disk Drive manufacturers to help them introduce new, more efficient assembly methods. In comparison to the traditional solutions available to manufacturers, RENCOL® Tolerance Rings make assembly more consistent and straightforward. Choosing to work with Saint-Gobain can reduce overall assembly costs by up to 20%.
Tolerance rings can address the challenge of mounting an actuator arm around the pivot. Using adhesive complicates assembly, increasing costs and failure rates from initial installation and over time. Alternatively, a screw set demands absolute precision leaving no room for error and increasing manufacturing difficulty. A RENCOL® Tolerance Ring provides the ideal solution, allowing increased tolerances on mating components and delivering a quicker and simplified assembly.
Longevity assured data is important – whether personal or business. Consumers need to be able to trust in a brand of Hard Disk Drive they choose, knowing that the data they depend on for business or the treasured memories they store will be kept safe into the future.
When it comes to Hard Disk Drive components, small parts can make a big difference. When mounting the actuator arm, unreliable processes for mechanical fixation (by grouting or screwing) can lead to an increased radial load of the very sensitive bearing components. This can change the friction and cause damaging torque ripple. Therefore, a smooth fixation of bearings components is mandatory to allowing the reading head to move over the disk at high speed and with perfect precision.
Manufacturers must deliver robust, long-lasting products to inspire confidence and earn trust. Single components are not allowed to be displaced or loosened and jeopardize their function also at strong vibrations a Hard Disk Drive is facing over lifetime.
By working with our customers, we’ve developed a RENCOL® Tolerance Ring keeping components in place and enabling optimum performance for the life of the drive even under harsh conditions.
Find out more about bearing mounting on our Bearing mounting solutions with RENCOL® Tolerance Rings webpage.
For the disk drive manufacturers trying to accommodate more and more data bits on the surface of a media disk, performance parameters are becoming increasingly stringent. Costs are continuously spiraling down, as performance increases. Resonance performance, torque ripple and manufacturing costs are being increasingly squeezed.
RENCOL® Tolerance Rings/ interference bands can be used to mount the bearing assembly or bearing cartridge into the drive.
This is a key link within the disk drive and allows the performance to be improved.
|Hard Disk Drive Comparative Solutions|
|Spring Clip||Set Screw||Adhesive||RENCOL® Tolerance Ring|
|Ease of Rework|
View our collection of Hard Disk Drive videos to better understand how our products can make your job easier and save your money.
The set screw is the second most popular pivot attach method used in the HDD industry, after the tolerance ring.
For mass volume production, reducing assembly time is crucial to lowering operational costs, WIP, required floor space, etc. With the RENCOL® Tolerance Ring, it is possible to quickly and accurately assemble the bearing pivot into the arm with great repeatability.
A major percentage of the scrap costs incurred during the assembly process occurs by having to throw away crucial—and expensive—items such as the head, arm and bearing pivot if the overall drive fails. Most likely root cause is unfortunate mating of tolerances. When a RENCOL® Tolerance Ring is used, it is possible to replace components without wasting one component.
When adhesive, the closest technical rival to the RENCOL® Tolerance Ring, is used in the assembly, the cycle time increases dramatically. In addition to the time issues seen, in case of unfortunate mating of tolerances, the drive does perform well. Rework is almost not possible and expensive components are lost.