Bearing Installation Tool

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Although a bit tedious, this first stage is just as vital as those that follow it. Being lackadaisical this early on in the process could threaten the bearings’ chance for survival, well before the mounting begins.

IBT Industrial Solutions was founded in 1949 with Industrial Bearings in mind. Since then, we have become a trusted source for industry knowledge and expertise when it comes to bearings. When you partner with IBT, you’re guaranteed access to the best service and brands in the business.

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There are two types of mounting processes. Mechanical, or cold, mounting is the simpler option and is used for smaller bearings with an Internal Diameter (ID) of up to 4″/100 mm. This is often a more convenient mounting method, as the bearing can be mounted with no electricity right on the application itself.

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Take special consideration to avoid applying force directly to the bearing’s: rings. cages. balls, rollers or seals. Start the bearing on the shaft with the rounder corner of the race going on first. Apply even, driving pressure, using smart, quick taps rather than heavy ones, while keeping everything square, supporting both the inner and outer race.

When it comes to bearings, the quality of the overall performance, reliability and efficiency they yield, begins with the quality and precision of their installation. If there’s one thing to take away from this, it’s that nothing lasts forever and it’s up to YOU to maximize every last operational hour of your application parts.

Bearing installation methods

While you might not be able to see the damage, any mishandling of a bearing can end up costing you tremendously in production downtime. Even just by dropping a new bearing on the floor,  Zerger says, “you don’t know the damage you could be doing. If that bearing costs $80 and it costs you $5,000 an hour for your production being down – and it takes an hour to put a new bearing in – its cheaper to throw that bearing away and install another new one.”

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Bearing fittingon shaft

It is important to check for proper seating of the bearing and use a special fitting tool to drive it onto the shaft. The tool should be complete with a sleeve, impact ring and dead-blow hammer.

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When engineers engineer a bearing, they calculate the life of how long it should last at a specific speed and load, and if you don’t put it on correctly, you cut that life down. “In all my years – almost 40 years now,” Zerger says, “I’ve never seen a failed bearing that’s come back, after we’ve sent it in to have it analysed, having failed because it was made wrong. It’s always the installation or lubrication issues.”

Once hot, carefully slide the bearing onto the shaft, and when it cools, it will grip the shaft and work efficiently. Always wear proper Personal Protective Equipment and be careful not to overheat the bearing past 250 F (or 210 F for bearings with shields or seals). Extreme heat can cause the bearing’s metallurgy to change, which can alter bearing dimensions and/or hardness.

Bearing mounting methods pdf

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The key objective in mounting bearings is finding the balance between minimum required force with maximum control. Determine the best bearing installation practice for your application and arm your workforce with the technologies and tools it takes to be successful.

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Roller bearings play a vital role in rotating machinery by helping to: reduce friction, transmit loads and support shafts. However, 48 % of bearings fail before their natural death from being put in wrong or mishandled. Perfecting the art of bearing installation will ultimately prolong application service life and minimize downtime caused by unnecessary bearing failure.

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For bearings with an ID that exceeds 4″/100 mm, the force needed to mount them increases considerably. This is best accomplished using heat in a process called hot mounting. The most vital factor in this method is the source of the heat. For example, techniques such as oil baths and exposure to open flames can harm and contaminate the bearings. Best results are attained using electric induction heaters, which allow for the easy regulation of heat.

A lot of production falls on the accuracy of the bearings, and even though they are often made of steel, bearings are surprisingly delicate. “If you take the human hair and split it 10 times, that’s the precision that these bearings are made to have,” Tim Zerger, Bearings Business Group Director at IBT, says.

Shafts with oil ducts and grooves can accept oil injected between the bearing bore and shaft surfaces, which creates a thin oil film. This reduces both the friction and the required force needed to mount the bearing. With an oil film applied, bearings can then be physically mounted using the hydraulic pump to drive them up the shaft. It achieves this by pumping oil into the hydraulic nut, which then pushes the piston out, ultimately exerting a force great enough to move the bearing into position. All the while, the pressure is being monitored by the pump for quality assurance.

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First, all bearings should be stored flat in a cool, clean, low-humidity environment free of dust, shocks and vibrations. In addition, there are three good habits to get into, in preparing for bearing installation, to prevent from contamination and corrosion.

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Hydraulic mounting is recommended when dealing with extra large bearings, or tapered shafts anywhere from 2 to 37 inches in diameter. It requires less manual effort and promotes greater operator safety. Hydraulic techniques allow for greater control and precision, as well, while minimizing the risk of damage to bearings and shafts.

The key here, is the temperature difference between the bearing and the shaft. Normally, a bearing temperature of about 150 F above that of the shaft is sufficient. Heating of the inner race and freezing of the outer race is the most common and recommended method. Required heat varies, though, so be sure to refer to the bearing manufacturer’s (OEM) heating guidelines.