While it may seem simple in the scheme of a large project, the manner in which a bearing is installed and quality tested is essential to the success of any mechanical system.
If the installation of the bearing is not done properly or the quality-testing methods fall short, a variety of problems can arise. By following the installation tips outlined below and ensuring the proper quality checks have been performed, your bearings should work well from the point of installation.
Conducting quality checks on the bearings after installation is extremely important and can be done in a number of ways. igus® uses a pin-gauge test, also called a “go / no-go” test, to make sure our bearings are within specifications and will work properly once in service. Keep in mind, all measurement testing should be conducted after the bearing is press-fit into the housing. Prior to press-fitting, the bearing is oversized and may not conform to the listed specifications.
First, you want to install the bearings. Here are three important factors for proper bearing installation:
Now that the bearing has been installed, you want to perform a quality check. igus® conducts a pin-gauge (go / no-go) test after press-fitting the bearing into the smallest specified housing-bore dimension. Specifically, a "go" signifies the pin falling through the bearing under its own weight, while a "no-go" occurs when the pin does not fall through the bearing, or "sticks".
A pin-gauge test is the most accurate quality check because:
Once the bearings have been installed, they should be ready for operation. However, not every installation goes exactly according to plan. Below are two common post-installation problems with the corresponding solutions recommended by igus®.
The bearing is showing signs of material shave-off at installation.
Check that the housing has the recommended chamfer of 25-30 degrees. If using a sleeve bearing (which typically has only one end with an outside chamfer), match up the bearing’s outside chamfer with the housing-bore chamfer. If using a flange bearing, the sleeve portion (installed) has the outside chamfer already. In both instances, also check the housing bore to ensure it is not undersized.
Once press-fit into the housing bore, the ID after-press-fit is smaller or larger than the recommended tolerances.
If this problem arises, the following points need to be assessed:
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