BearingShopUK Blog

  • Quadpower Belts by Gates

    At BearingshopUK we stock Gates' entire range of Quadpower cogged V-belts.

    On the surface, Quadpower belts look similar to other cogged belts of that type, but they are in fact a far superior piece of kit. They are in fact Gates' most powerful industrial V-belt range. Coming from a market leader in the field, that says a lot.

    Quadpower belts are designed to essentially be as good as a V-belt is capable of being. The sides of the belt are precision ground to maximise contact with the pulley. The polyester tension cords are vulcanised into a single piece, making the belt more resistant to flexing forces. The rubber compund is heat, oil and ozone resistant as is backed with Gates' proprietary Flex-Weave textile which prevents wear from back-idler systems. The materials used in the belt will not catch fire under heat build-up, so slip clutch systems are no longer a problem.

    These belts have a far greater torque transmission factor than other V-belts, meaning that less belts need to be used on a pulley system. They also have amazing maintenance life, so they don't need to be replaced so often. This all means that costs are already kept down, which is even better when you realise that the belts themselves aren't nearly as expensive as you'd expect.

    All Quadpower belts are made to meet Gates' UNISET tolerance system, meaning that matched sets are very easy to make and replacement belts will fit as well as the old ones.


  • What is PTFE?

    Many plain bearings can now be purchased with the option of a PTFE (polytetrafluroethylene) lining.

    A better known term for PTFE is Teflon. You may know it as the non-stick coating on your frying pan or the waterproofing agent on your blazer. Teflon has been around since the late 1930's and has almost countless uses, but has specifically found a home as a solid lubrication.

    It has such success in this field due to its remarkably low friction coefficient. PTFE has a friction coefficient of 0.05-0.10, making it the third most frictionless material in the world (after diamond and aluminium magnesium boride). It is so slippery that it is used to prevent insects from climbing walls in some places.

    PTFE also has great thermo-resistant properties, having a melting point of 327 degrees Celsius. This is why it is used so widely in cookware.

    Finally, PTFE is extremely non-reactive. Only the alkali metal groups at high temperatures can damage it through chemical means.


  • What is Sintered Bronze?

    Our Oilite bushes are made from a material known as sintered bronze, a very popular material for plain bearings. It has great strength, heat resistance and self lubricating properties, but what exactly is it?

    Sintered materials are not just limited to bronze, most metallic elements can be processed this way. Sintering is basically the process of forming a strong and durable compound from powdered metal.

    To make sintered bronze, you start off with some powdered bronze. This powder is placed into a die mold and held under very high pressure until a semi-finished bush is formed. This unfinished bush is then passed through a furnace, which heats the powder to the point where it will meld into a solid piece, but not enough for it melt entirely. The bearing is then impregnated with oil, either from being immersed in hot oil for several hours, or through vacuum impregnation.

    The porous nature of this material means it acts almost as a metallic sponge, holding the oil within itself via capillary action. If an area of high pressure was introduced into the bore of an oilite bush, the oil would bubble to the surface on the outside.

    If these bushes are machined improperly, then the porous capillaries would be fused shut, and the oil could not escape. This would eliminate the self lubricating nature of the material. Properly machined sintered bronze has a grainy, almost speckly appearance, due to its porous surface.


  • Threadlocking Compounds

    Over its lifetime, any machine which contains nuts, bolts, or any threaded connector, will eventually vibrate itself apart. The simple threaded screw can't really be improved upon in terms of design, so how can we stop this? The best way is to use threadlockers.

    Threadlockers are methacrylite based liquid compounds. Their job is to prevent threads from vibrating loose. They are known as Thixotropic liquids, meaning that they can still flow freely after curing, but are still resistant to shock loads and vibrations. They are almost non-newtonian in that respect. Their chemical makeup allows them to cure in the absence of air, using the electrochemical reaction from the metal thread to facilitate hardening.

    Threadlockers are either permanent or removable. Permanent threadlockers are there to stay once applied, ensuring the thread never loosens. Removable threadlockers can be heated up with a torch or heat gun to loosen them for maintenence.

    They are available in liquid form, usually in small bottles, or in sticks or even thin tape form.29

  • Parker Hydraulics

    BearingshopUK is now a supplier of Parker products and stock just about every item across the range.

    Parker have over 45 years of experience in the OEM fluid power industry, and it shows. The sheer range of products available from them is staggering. You could go to the factory and walk out with either a handful of o'rings or a full aerospace system.

    Parker's massive variety can be attributed to the number of companies under the Parker brand. You have Parker Legris, Parker Tema, Parker Rectus, Parker Olaer, and the list increases. Each one specialising in a different field of motion control technology.

    225399&width=450&height=338&resize_mode=fillThis huge variety of expertise, combined with their extensive experience and R&D make Parker one of the biggest names in the Fluid Power industry, as well as a mark of flawless engineering and quality.

  • PIX Agricultural Belts

    We are now able to offer PIX India's range of Agricultural and Combine belts alongside our standard range.

    These belts are specifically designed to be used in heavy agricultural machinery. Normal V belts would struggle to cope with the extensive use of reverse idlers and excessive amounts of torque on offer in these machines.

    PIX harvester belts are made with a specially rigid side wall to prevent side to side belt warping, and their reinforced inner and outer faces are resistant to cracking when bent the wrong way. The polyester cord inside the belt has also been strengthened to better cope with stress before snapping.

    There is also an extensive range of combine belts available from PIX, each designed to be a direct replacement for a specific part in a specific machine. These belts are made for brands such as Massey Ferguson, Claas, New Holland, Case and more. They are made to the same strength and quality as their standard agricultural belts.


  • Custom Hydraulic Hose Assemblies

    We are now offering completely custom hoses for use in hydraulic applications.

    It is always frustrating when you require a new hose for your machine, but can never find the correct length with the correct fittings. Usually the only place to go is direct to the manufacturer, but this is not much use when your machine is discontinued or the company themselves no longer exist. Either way, the costs will be through the roof in most instances.

    However, we can now offer an alternative at a reasonable price. Our hydraulic hose is reinforced with high tensile steel and conforms to DIN, SAE, BSC & EN standards. It is available in diameters of 1/4" to 1" and can be cut to whatever length you require, from 0.5m to 30+m and anything in between.

    We can also fit whichever standard hose fitting you need to each end. We can fit DKR, RNR, AGR and many more in various different sizes. You can specify a different fitting for each end for absolute flexibility when needed.

    Technical specifications of each fitting are available on the products page, and datasheets for hoses are available on request.


  • What is C3?

    One of the most annoying physical properties of metal is that it expands as it heats up. This is fine for static parts such as pipes, screws etc, but for moving parts that require exact precision, this is a real problem.

    When ball bearings rotate above a certain speed, the internal friction causes the balls inside to heat up and expand. This can lead to seized bearings or even cracked races. So what happens when you need an bearing to move really fast?

    Enter C3 bearings. Most standard sizes of ball bearings are available as a C3 version, and have the exact same inner, outer and width measurements as their non-C3 counterparts. This kind of bearing is designed to withstand higher internal temperatures without seizing, but how does it do that?

    Essentially, these bearings have a bit more 'wiggle room' in their internal design. The clearance between the outer and inner race and the balls is greater. This gives the balls room to expand in the heat without interfering with the operation of the bearing.

    This does not give them an advantage over non-C3 bearings however. C3 bearings require high speeds to work at their optimum level, at low speeds the balls are still cold so they do not fill the clearance between the inner and outer races. This means that the outer race will have a small degree of movement in relation to the inner race at slow speeds. Non-C3 bearings do not have this issue.

    There are higher clearance models available for several bearing sizes, they are available in C3, C4 (an even higher clearance) or even C5.


  • Timing Belt and Pulley Matching

    When building a pulley system involving timing belts, it is important to make sure that the pulleys you get will match the belts correctly.

    Timing belts come in various sizes and tooth widths (or pitch lengths). Pulleys can come in the same number of varieties. A 15mm wide timing belt with an 8M pitch is not going to work properly in a 12mm pulley with a 5M pitch.

    2These two properties - width and pitch are the two details that need to be identical on both your belt and pulley. The overall length of the belt or number of teeth on the pulley is up to you and depends on what kind of system you're building.

    There are certain pitch lengths that seem to be alike but are in fact different to each other. T5 and 5M for example, both denote a 5mm pitch length. However, they are not interchangeable. T5 Belts are known as 'Classical' belts, with a squared off trapezoidal tooth profile, whilst 5M has a smoother more rounded profile. Thus a T5 belt will not mesh correctly with a 5M pulley and vice versa. Similarly, T10 and AT10, whilst both classical timing belts with a 10mm pitch length, still are not interchangeable due to different tooth angles.

  • Hexagonal Mower Belts

    We are now able to supply Hexagonal - or double sided V belts from PIX.

    Normal V belts have a trapezoidal cross section. Their design gives them the ability to drive pulleys from their sides, rather than their inner edge and provides far more torque than an old fashioned flat belt. However, what if there are more than two pulleys in your drive system? If the pulley is too far within the loop, the belt will not reach it. Even if they are just touching the belt, there will be hardly any power transmission as the belt does not have enough purchase on the pulley to properly wedge in and provide drive.

    This is where Hexagonal belts make the difference. Unlike the traditional trapezoidal V belt, Hexagonal belts have a (you guessed it) hexagonal cross section. It is essentially two V belts joined back to back throughout their length, but they are a single unit.

    Hex belts can drive pulleys on either side, so now your multi-pulley system can work fine with just a single belt snaking it's way in and out through the pulleys.


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