Product category:
Miscellaneous machine tool equipment (fixtures, rotary tables etc.)
News Release from: NSK UK | Subject: Super precision angular contact bearings
Edited by the Manufacturingtalk Editorial
Team on 06 April 2005
Super precision bearings resist heat and
seizure
Super precision angular contact bearings combine the benefits of SHX heat and seizure resistant steel and ceramic balls, to meet the requirements of internal grinding machines.
NSK's new BGR Series of super precision angular contact bearings combines the benefits of SHX heat and seizure resistant steel and ceramic balls, to meet the high accuracy (ISO Class 2) and high speed (up to 244,000 rev/min) requirements of the internal grinding industry The combination of special long life SHX steel and ceramic balls in the BGR design also ensures extra bearing life for users of grinding spindles
This article was originally published on Manufacturingtalk on 30 Apr 2004 at 8.00am (UK)
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SHX steel is highly suited for use in machine tool spindles, which must run at high speeds with a minimum supply of lubricant Importantly, the heat resistance of SHX is nearly equal to that of M50 steel, a material which is used widely in bearings for jet engines, while its wear resistance, resistance to seizure and durability are all superior.
Building on its special materials technology, the optimised BGR design integrates an outer ring guided cage for better lubrication and also has the shoulder of its inner ring relieved to ensure a stable supply of oil into the bearings.
The net benefit of these measures is more reliable and efficient bearing operation under the demanding high speed, high temperature conditions encountered in internal grinding.
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Offering ultra high accuracy to ISO Class 2 (ABMA ABEC9) as standard, the BGR series bearings offer easy handling for the user as a result of their non-separable inner ring.
This feature makes spindle assembly easier, while allowing users to benefit from the ability to configure the BGR bearings in universal combinations of back-to-back (DB), single or tandem (DT), or face-to-face (DF) arrangements.
BGR series bearings are available in ISO dimension series (10 and 19) and bore sizes from 6mm to 25mm, and are offered with the choice of steel balls, ceramic balls or a combination of ceramic balls and SHX rings.
The bearings are suitable for use with high-speed greases (up to 192,000 rev/min with ceramic balls) and SHX material and oil-air lubrication systems, which, in combination with ceramic balls and SHX rings, enable the BGR series bearings to achieve their highest operating speeds: up to 244,000 rev/min with a 6mm bore bearing.
BGR series bearings with SHX rings are suitable for use in the repair and maintenance of internal grinding spindles, where they can provide an upgrade in terms of reliability.
* BGR bearings contained In new Super Precision Bearing Catalogue - full details of the BGR series bearings and NSK's other super precision range of bearing products are contained in a new global catalogue just produced by the company.
The new publication covers what is probably the largest range of super precision bearings available from any one manufacturer.
It runs to 210 pages and contains seven easy-to-use sections, plus a host of illustrations and tables dealing with everything from mounting to pre-load constants to lubrication types, and tolerances for shaft and housing bore diameters.
The layout of the new catalogue is designed to support spindle designers by simplifying the task of finding product and application information.
The catalogue also contains a section on spindle bearing selection with helpful explanations of spindle design.
Free copies of the Global Precision Catalogue are available via NSK UK.
Callers should quote the catalogue reference E1254 and also the title of the publication: Super Precision Bearings Catalogue. Request a free brochure from NSK UK ...
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