Re: Pulleys Bearings Residual Clearance
You might want to consider the SKF Drive-up Method as shown in this video.
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Gary Blenkhorn
President - Bulk Handlng Technology Inc.
Email: garyblenkhorn@gmail.com
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Offering Conveyor Design Services, Conveyor Transfer Design Services and SolidWorks Design Services for equipment layouts.
Re: Pulleys Bearings Residual Clearance
Originally Posted by jurajchmelik
I am seeking an advice from someone who was in a simillar situation where a large number of pulleys bearings ( 200+) need to be checked for a residual clearance. The feeler gauges have only 0.025-0.030mm and are too fine not to get damaged. Here is the link onto SKF website with recommendation for mounting http://webtools.skf.com/mounting/new....2.1&time=some but I would like to hear if there is another/ more practical way to check the clearance between shaft and an inner ring of the bearing. Thank you. Oceanspray
Thank you Gary for your reply ■
Re: Pulleys Bearings Residual Clearance
If we are going to quote the SKF method we are assuming twin row spherical roller assemblies as shown.
While it is most probably impossible to check the inside row clearances physically because of the presence of the pulley and seal it is therefore advisable to rely on variants of the SKF advice. Whatever you do, you are working in the dark, relying on the cumulative experience of bearing manufacturers.
In conveying applications the internal clearances are influenced by situations such as belt tension, whether the pulley is in the conveyor or in the workshop. While the tension relaxation is obvious the workshop situation is also rather clear. If you spend money and lost production then the bearing replacement should be considered. Otherwise you will have the nagging doubt that internal clearance might rapidly develop soon after re-installation of the pulley. Selby coalfield replaced 147 pulleys in 1982 and they failed again in
early 1983. The culprit was diaphragm flexure but the bearing seat flaws didn't help.
I only mention my experiences because it seems that if you are having to examine 200 (or 400) bearings on 200 pulleys then something else might be a contributing factor. I examined the SKF video again and noticed that feeler gauges are not accessible if you have sealed bearing units: which you probably have. So why did they poke a feeler around at all? Please explain your situation in more detail.
At the end of the SKF video there is a guy seen flogging the locknut into place. This was probably good enough before the hydraulic system came into effect and maybe it is still a good enough method now. You still can't use feeler gauges with a reasonable life expectancy but if there is excessive clearance you might get away with devising a flogging spanner which will only require access to the locking tabs. Personally I would use a bigger hammer. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Skf Bearing
Originally Posted by johngateleyWhile it is most probably impossible to check the inside row clearances physically because of the presence of the pulley and seal it is therefore advisable to rely on variants of the SKF advice. Whatever you do, you are working in the dark, relying on the cumulative experience of bearing manufacturers.
In conveying applications the internal clearances are influenced by situations such as belt tension, whether the pulley is in the conveyor or in the workshop. While the tension relaxation is obvious the workshop situation is also rather clear. If you spend money and lost production then the bearing replacement should be considered. Otherwise you will have the nagging doubt that internal clearance might rapidly develop soon after re-installation of the pulley. Selby coalfield replaced 147 pulleys in 1982 and they failed again in
early 1983. The culprit was diaphragm flexure but the bearing seat flaws didn't help.
I only mention my experiences because it seems that if you are having to examine 200 (or 400) bearings on 200 pulleys then something else might be a contributing factor. I examined the SKF video again and noticed that feeler gauges are not accessible if you have sealed bearing units: which you probably have. So why did they poke a feeler around at all? Please explain your situation in more detail.
At the end of the SKF video there is a guy seen flogging the locknut into place. This was probably good enough before the hydraulic system came into effect and maybe it is still a good enough method now. You still can't use feeler gauges with a reasonable life expectancy but if there is excessive clearance you might get away with devising a flogging spanner which will only require access to the locking tabs. Personally I would use a bigger hammer.
Thank you for your comment. We have a greenfield project of a conveyor system with many conveyors. The client requires a protocol of bearing installation on pulley shaft. We have to follow the SKM procedure of installation and fill in the gaps measurements in the protocol that we have found out to be.... I was trying to find a more practical solution, since I have my personal opinion about this. ■
Pulleys Bearings Residual Clearance
It is a greenfield project, with a system of large numbers of belt conveyors. Client wants us to make a Written protocol on each pulley bearing installation. It is not easy to measure the gaps...that is why I wanted to find out how others deal with the same thing...Thank you ■
Pulleys bearings residual clearance
Gentleman.
I am seeking an advice from someone who was in a simillar situation where a large number of pulleys bearings ( 200+) need to be checked for a residual clearance. The feeler gauges have only 0.025-0.030mm and are too fine not to get damaged. Here is the link onto SKF website with recommendation for mounting http://webtools.skf.com/mounting/new....2.1&time=some but I would like to hear if there is another/ more practical way to check the clearance between shaft and an inner ring of the bearing. Thank you. Oceanspray ■