Guide to the mounting and dismounting
of rolling element bearings now available

The correct mounting and dismounting of rolling element bearings can save time and dramatically increase the life of bearings, as well as maximising the availability of critical plant and machinery by avoiding costly breakdowns.

The key here is to ensure that the appropriate tools and equipment for the mounting and dismounting of rolling bearings are on hand for the engineer at the installation or assembly stage. Appropriate tools may include thermal mounting and dismounting tools (i.e. heating plates), induction-heating devices, mounting paste and heating rings, as well as feeler gauges, hydraulic extractors, hydraulic nuts and hand pump sets. Using the correct tools ensures that bearings are mounted and removed easily and quickly without causing damage to the bearings or surrounding equipment and in a safe and reliable way.

In order to help plant, maintenance and service engineers, Schaeffler UK has recently published a new technical guide entitled 'Mounting and Dismounting of Rolling Bearings'. This handy, pocket-sized guide includes useful guidance and clear instructions on how to store, handle, clean, mount, dismount, lubricate and maintain rolling bearings.

The guide also includes a special section that discusses the possible typical causes of bearing damage and failure. This includes faulty mounting, contamination, corrosion, the passage of electrical current, and incorrect bearing lubrication. There is also a section at the back of the guide that contains tabular information on bearing part numbers, bearing tolerances and their mating components (i.e. shafts and housings), bearing clearance and FAG rolling bearing greases (Arcanol).

As well as the guide, Schaeffler UK also offers a range of tailor-made, modular training courses on bearing mounting and dismounting, lubrication, alignment, condition monitoring and maintenance management. Training can be carried out at Schaeffler's UK-based headquarters in Sutton Coldfield, or at the customer's own premises.

Bearing mounting and dismounting courses include training modules on rolling bearings, mounting tools, failure recognition and more specific courses such as tapered roller bearing maintenance for rail vehicles.

For a free copy of the 'Mounting and Dismounting of Rolling Bearings' guide, email: info.uk@schaeffler.com and ask for a copy of WL80100.

For further information on the Schaeffler Group, e-mail: info.uk@schaeffler .com or view website: www.schaeffler.co.uk    Refer to next page

New deep groove ball bearings offer 50
per cent less noise and 35 per cent less friction

By optimising the contact geometry between the rolling elements and the ring raceways, Schaeffler's new 'Generation C' deep groove ball bearings are quieter, more energy efficient and offer increased lubricant life.

A range of new deep groove ball bearings has been developed that offer 35 per cent less friction and 50 per cent less noise than their predecessor. In addition, the new bearings benefit from more effective sealing and a riveted steel cage.

The new design improvements mean that Schaeffler's new 'Generation C' FAG deep groove ball bearings can achieve higher running speeds and efficiencies, whilst simultaneously increasing the life of the bearing and reducing energy consumption.

In order to minimise friction, Schaeffler optimised the osculation (raceway curvature) between the balls and rings on the Generation C bearings. This means there is less chance of misalignment between the inner and outer ring. As well as offering 35 per cent less friction, the bearings generate less heat, making them suitable for higher running speeds. The bearings are therefore ideal for applications in which low noise and smooth running are critical, for example, electric motors, power tools, ventilators and washing machines, where reduced friction and improved energy efficiency of the bearings lead to a reduction in operating costs and a more efficient machine with extended maintenance intervals.

Schaeffler also modified the seal on the Generation C bearings. The new novel HRS seal has modified double lip geometry and is made from nitrile butadiene rubber. They are adjusted to match the recess on the bearing inner ring. Axial contact between the inner ring and the seal means more effective protection against contamination or loss of grease and less frictional torque. This results in longer grease life, increasing the life and reliability of the bearing and provides improved bearing performance at higher speeds (rpm).

Venting grooves have also been added in order to improve the run-in behaviour of the bearings. In addition to the HRS seal, the bearing shield has been modified. The recesses on the bearing rings and the shield geometry are functionally adjusted to each other in such a way that the sealing efficiency is improved and grease life increased. The new design creates an axial and radial labyrinth with the shield.

The improved guidance of the rolling elements also contributes to higher performance of the bearing. The new riveted steel cage, which replaces the previous steel 'ribbon' cage, offers higher rigidity and so is suitable for higher running speeds. The riveted steel cage also reduces noise levels and means the bearing is less sensitive to shock loads. The manufacturing tolerance of the bearings has also been increased (to P5 Abec 5 standards), ball roundness to G5 tolerances and improved surface finish.

The dimensions of the new bearings correspond to the previous bearing types, enabling easy replacement. Generation C bearings can operate in temperatures from -30°C up to +120°C, and available with outside diameters from 26mm up to 90mm. Riveted steel cages are standard, although polyamide cages are optional. P6 or P5 tolerances can be specified on ordering. Sealing options include one or two gap seals; one or two lip seals; or low friction, non-contact labyrinth seals.

For further information view website: www.FAG-GenerationC.de     Refer to page 18

QTC metric gear catalogue on new CD-ROM
features eStore Interactive Links to over 3,700 products

A new CD-ROM from Quality Transmission Components (QTC) features their 528-page metric gear catalogue Q420 and eStore Interactive links to over 3,700 products. With the CD-ROM you can order online, request a quote, download 3D CAD models, check stock plus view product specifications and technical pages.

The CD-ROM, identified as Q422, contains a comprehensive technical reference section entitled "Elements of Gear Technology". The topics covered include the principles of involute gearing, gear dimension calculations, the definition of backlash, plastic gear design, elements of gear accuracy, principles of surface contact, methods of lubrication and methods for noise reduction.

The product section on the CD-ROM includes detailed specifications of the complete offering of off-the-shelf Spur gears, Helical gears, Screw gears, Ratchets & Pawls, Gear couplings, Worms & Worm Wheels (Standard & Duplex), Ring gears (Internal & External), Involute splines (Internal & External), Racks (Straight, Helical & Flexible), Miter gears (Straight & Spiral) and Bevel gears (Straight & Spiral). These 3,700+ products are offered in sizes from module 0.5 thru module 10, in materials that include alloy steel, carbon steel, stainless steel, cast iron, aluminum bronze, brass, cast iron, nylon, and acetal.

Detailed specifications are contained in CD-ROM Q422, available free upon request from Quality Transmission Components, 125 Railroad Avenue, Garden City Park, NY, USA 11042-5416. Tel: 516-467-6700, Fax: 516-328-3343, or view website: http://www.qtcgears.com/QTCpress/Q422CD.htm    Refer to page 49

New spring suspension mounts from AAC
are designed for suspending from 22 to 705 Lbs      

New spring suspension mounts from Advanced Antivibration Components (AAC) are designed to isolate suspended products that weigh from 22 up to 705 lbs. A popular use for these vibration isolators involves their use in suspending piping in heating, ventilating and air conditioning (HVAC) applications.
 
There are 11 mounts identified as the V11Z71MKSH... Series constructed with a zinc-plated steel housing. The spring is made from hard drawn steel that is painted. The lower plate is made of neoprene. By having rubber on both ends of the coil spring, the unit can reduce vibrations for a wide range of frequencies. They are best suited for hanging from ceilings small machines such as fans, distribution pipes and ducts. At the AAC eStore you can check price and availability, place an online order, download 3-D models, or request a quote at anytime.

Additional technical specifications are contained in Catalogue V110, available free from Advanced Antivibration Components (AAC), 2101 Jericho Turnpike, Box 5416, New Hyde Park, New York, USA 11042-5416. Tel: 516-328-3662, Website: http://vibrationmounts.com/NewProducts/Spring_Suspend.htm   Refer to page 17