SEALS & BEARINGS FEATURE
by most OEMs. The purpose of testing is to verify the correct installation has taken place of the replacement bearings. Testing tools can be tailored to suit OE
specifications or custom made for non- OEM specifications.
PROOF LOADING TOOLS Proof loading tools are typically available as either portable or press style tools. The latter come in the form of pusher and receiver cups to support the bearing while being pressure loaded during tests. These are ideal for any specification where precise incremental loads need to be applied as they securely hold the bearing and evenly distribute the load to provide accurate testing results. Each size of bearing requires its own pusher and receiver cup in order to accurately match the swaging groove and housing on each bearing. Portable proof loading tools normally take the form of an electronic handheld display, receiver cups, load cell and DTi gauge. These highly mobile units enable, if required, proof loading of newly installed bearings without the need to fully remove the component from its assembly. Each unit is supplied with a load cell specific to the bearing being used and calibrated to the specific to the appropriate load value required by the specification. Electronic handheld displays
can be calibrated to work with a number of load cells which reduces costs as a single display can be returned for re- calibration and additional load cells added to its library only requiring the purchase of an additional load cell. Electronic proof loading tools are
typically supplied with DTI gauges for displacement measurement.
BREAKAWAY TORQUE TESTING TOOLS Breakaway torque testing tools use a special torque wrench which, while holding the bearing place, measures the force required to rotate the ball once the bearing is installed into its housing. These tools are normally lightweight, compact and can easily be used on components already installed in the application. Breakaway torque testers and receiver cups are made to order items that are designed to help measure effectiveness against the requirements of the customer’s specification. Typically, the hardware that retains the bearing and the torque limits of the tool can be customised for the specific application. Multiple retainers and receiver cups can be used with a single torque tool which helps to keep overall costs low.
Carter Manufacturing T: 01865 821 720
www.carterbearings.co.uk
BEARINGS ELIMINATE CONVEYOR FAILURE
By switching to an NSK solution after repeated bearing failures on one of its principal conveyors, a milk processing plant is achieving annual savings of £10,000. As the bearings were located in an inaccessible area of the plant re-lubrication was not possible so they had to be changed every 10 weeks, leading to downtime of three hours which was proving expensive. NSK proposed stainless steel bearing
inserts fitted with Molded-Oil, NSK´s proprietary oil-impregnated solid material to help increase service life. Molded-Oil offers grease-free properties with no requirement for oil refilling as it slowly seeps from this material, proving ample lubrication to the bearing for extended periods. This supports longer service life while keeping the environment clean. NSK recommended the use of Silver-Lube corrosion-resistant polymer housings which are ideal for applications where frequent wash-downs and optimum hygiene standards are required. Silver-Lube features nitrile rubber seals, is NSF-approved and available in four geometries.
NSK UK T: 01636 605123
www.nskeurope.com
IRISH MANUFACTURING | SPRING 2017 29
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