Product category:
Bearings
News Release from: Brammer UK | Subject: NSK-RHP Ultra series spindle bearings
Edited by the Engineeringtalk Editorial
Team on 05 July 2000
High performance NSK-RHP spindle
bearings from BSL
BSL is helping machine tool users to achieve performance improvements at low cost with the introduction of the new Ultra series super precision spindle bearings from NSK-RHP.
BSL is helping machine tool users to achieve performance improvements at low cost with the introduction of the new Ultra series super precision spindle bearings from NSK-RHP The Ultra series combines high speed capabilities (up to 2.5 x 106 DmN for the steel ball version) with low internal heat generation, whilst maintaining the precision, accuracy and high surface finish of precision machined parts
This article was originally published on Engineeringtalk on 7 Jun 2000 at 8.00am (UK)
Related stories
BSL delivers panel for tanker testing in 10 days
In just ten days BSL designed, built and delivered a control panel to General Trailers in Norwich for the testing of road tanker containers.
Instant seal gasket straight-from-the-can
The costly downtime incurred waiting for the delivery of cut gaskets, or in sourcing special types, can be avoided with Loctite's new Black Tite, straight-from-the-can instant seal gasket.
The Ultra series achieves speeds in its steel ball versions previously attainable only with ceramic balls.
Importantly, this improved performance is achieved within the standard ISO series 10 size envelope.
This means that the bearings are dimensionally interchangeable with standard super precision bearings and can readily replace the latter units in machine tool spindles for higher speed capability.
Further reading
Lubricant extends chain life on overhead conveyors
Chain life on overhead conveyors can be extended, and product contamination minimised, with new Foodlube Overhead Chain Fluid, the latest addition to BSL's Rocol range
Energy report saves Goodyear serious money
BSL Fluid Power in partnership with Maxura have carried out an energy management survey of Goodyear's compressed air system at the tyre manufacturer's Tyre Retread plant in Wolverhampton.
The Ultra has an optimised internal design which ensures low heat generation.
The bearings have a 15deg contact angle for high speed operation, and are equipped with a very light weight one piece Phenolic cage.
An advantage of the Phenolic cage is that it retains small quantities of oil, and therefore functions well under marginal lubrication conditions at high speeds.
Finally, the internal geometry of the Ultra is such that dynamic stability is very high, resulting in lower wear and less fall-off of stiffness at high speed.
For applications where even higher spindle speeds are required, BSL is offering a HY version of Ultra with ceramic balls.
The use of silicon nitride ceramic balls significantly reduces centrifugal forces since its density is only 40% of that of carbon/chrome steel.
What this means in practice is that under high speed running, stresses at the outer ring of the hybrid bearing are reduced, with the result that reliable operation at speeds up to 2.8 x 10-6Dm.N (a 12% increase over steel rolling elements) is easily achievable using oil/air lubrication.
Even higher speeds than this can be obtained under certain conditions.
Ceramic balls offer another advantage in that their modulus of elasticity is 50% higher than that of steel and have a much longer fatigue life.
This higher modulus raises the stiffness of the bearing by about 12% when stationary, and at speed there is less fall-off of stiffness, the latter being a condition which results from changes in ball/raceway contact conditions.
In fact, depending upon speed, the bearing stiffness using ceramic balls may be raised by anything between 12 - 100%.
• Brammer UK: contact details and other news
• Email this article to a colleague
• Register for the free Engineeringtalk email newsletter
• Engineeringtalk Home Page
Search the Pro-Talk network of sites
