The UK and many other countries have set Workplace Exposure Limits (WEL) for isocyanates. In the UK, airborne concentrations should be kept below the WEL and to a level that is as low as reasonably practicable.

There is a total clearance available for thermal expansion that is equal to the thickness of the location ring. The expansion and contraction of material must be considered in order to maintain the clearance that is required to operate the bearing well. In the diagram, the clearance for contraction by cooling is indicated by C and the clearance for expansion by heating is indicated by B. The table shows the maximum values for C and B depending on the diameter of the shaft.

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8. Lift the shaft a little so that the bearing is free from load and the adapter sleeve can move freely.9. Place the locating ring in position and then screw on the locking nut with its chamfer side facing the bearing. Before starting the final tightening procedure, the bearing should be pushed up onto the tapered seat until the bearing inner ring cannot be rotated relative to the shaft. Then turn the nut through the tightening angle as given in the table for spherical roller bearings. The bearing will be displaced axially (inwards) on the tapered seat during tightening. The residual clearance of the roller bearing should be checked if possible.

Pragma and Associates has decades of experience in controlling exposure to isocyanates and have helped workplaces to prevent occupational ill-health and comply with the relevant legislation.

7. The locking mechanism for the bearing is based on an adapter sleeve. First put some grease on the locking nut, both on the thread and the front surface.

Our opinion and our advice are not guaranteed and Extreme Bearing shall not be liable for the consequences of any damages caused by incorrect advice or the contents of this website. The customer is responsible for checking that the right choice of Extreme Bearing product has been made to match their actual working conditions and dimensions.

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Calculate the maximum shaft length depending on the temperature in your application. In case you need to mount a long shaft, it is necessary to calculate the thermal expansion or contraction and adjust the bearing position to take this into account. As an example, a stainless steel shaft of 1 metre will become 0.023 mm longer when the temperature rises by 1°C and a carbon steel shaft of 1 metre will become 0.016 mm longer when the temperature rises by 1°C. The table shows the maximum shaft length depending on how the temperature changes during operation after the time of installation.

People can become sensitised to isocyanates, which can trigger an asthma attack even with low-level exposure. This can be via inhalation and skin contact.

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Exposure in the workplace can occur from a variety of processes. Routine tasks, such as painting, varnishing, foam-blowing, the manufacturing of insulation materials (e.g. car seats, furniture, mattresses) and adhesive application, can lead to isocyanate exposure.

Method 2:In case you want highly accurate axial positioning on the shaft, position only the bearing on the fixed side in the casing. As shown in figure 2, the position of the outer edge of the bearing race is not exactly level with the outer edge of the bearing housing after tightening the bearing adapter sleeve. This difference is indicated by A in figure 2 and the table shows the recommended values for A in mm depending on the diameter of the shaft.

In some configurations, the bearing units from Extreme Bearing are pressure-tight. Therefore it is necessary to keep the cover a little bit open while you do the initial greasing. Otherwise problems like in the picture shown here can occur.In addition, whenever it is necessary to add some more grease later, you should always take care not to create over pressure in the housing. The Extreme Bearing units are pressure-tight when used with the following configurations of seals: AS/AS, AS/VK, CL/CL and CL/VK.Please inform your maintenance crew about this special service operating instruction. After filling with grease, it could be helpful to take away the grease nipples completely and exchange them with a standard stainless steel bolt, so it will be impossible to make mistakes.

Extreme Bearing B.V.Hoofdstraat 45 ANL04441 AA Ovezande,The Netherlandsinfo@extremebearing.com+31 854 013 889Chamber of commerce 82408599

Your risk assessments for processes involving isocyanates should be completed by a competent person, include comments on the following and, where appropriate, outline reasons why further control measures cannot be implemented:

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Pragma and Associates explain that health effects related to isocyanate exposure can include lung problems and irritation to the eyes, nose, throat and skin. Symptoms can include chest tightness, difficulty breathing and inflammation of mucous membranes and skin.

Our opinion and our advice are not guaranteed and Extreme Bearing shall not be liable for the consequences of any damages caused by incorrect advice or the contents of this website. The customer is responsible for checking that the right choice of Extreme Bearing product has been made to match their actual working conditions and dimensions.

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16. The last step is to fill up the bearings with grease. Slowly pump the grease into the bearing unit while rotating it by hand and stop pumping as soon as you notice that no air is gradually passing the seals. If you pump too fast, the trapped air will push the excess grease out of the bearing before it is full.

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Contact:Extreme Bearing B.V.Hoofdstraat 45 ANL04441 AA Ovezande,The Netherlandsinfo@extremebearing.com+31 854 013 889Chamber of commerce 82408599

Place a spanner wrench in the groove in the locking nut and use it to tighten the bearing onto the shaft. Tightening angles are given in the table

13. Check that the shaft is not too long in case you want to use a closed blue cover seal. If you have a bearing for a drive situation, use an open cover with a shaft seal. In that case, put some grease on the seal lip and carefully push the seal over the shaft.

Having a competent person undertake an industrial hygiene assessment, including air monitoring, can help you ascertain the level of control of isocyanates in your workplace. Air monitoring results should be included in your risk assessment.

Polyurethane products, such as foams, elastomers, adhesives and paints, use isocyanates as a raw material. Isocyanates can severely impact the health of those who work with them, as they’re classified as potential human carcinogens and are one of the leading causes of occupational asthma in the UK.

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2. Check the hardness and surface roughness of the shaftThe hardness of the shaft should be a minimum of HRc 55. In general, shafts of carbon steel or stainless steel are most suitable. What’s even more important than a correct interference fit of the oil seal, is a perfectly smooth shaft in the region of the seal. The surface roughness of the shaft (Ra value) depends on the average profile depth of the tool marks caused by the machining process.

14. When you have chosen Method 1 at step 6 in the instructions, the shaft with the bearing shall have about one millimetre clearance backwards by mounting on the fixed side. In case your construction demands Method 2 with highly accurate axial positioning, check the position. If there is too much displacement, undo steps 6-14, correct the position and repeat the steps again.