Cast iron pillow block bearings are a common component in numerous industrial machinery. For example, you can find them in agricultural machinery, construction machinery, and even in conveyor systems. Moreover, it is possible to find cast iron pillow block bearings in material handling systems and package handling systems.
These robust bearings can support the rotating shafts while handling heavy loads. Cast iron pillow block bearings provide excellent vibration dampening and shock load capacity. They can withstand high temperatures and have self-lubricating properties for low-friction operation. Also, ensure that you buy your cast iron pillow block bearings from a place that you can trust.
Due to the critical role pillow block bearings play, you should be careful at the time of replacing them. Cast iron construction makes these bearings highly durable even in harsh environments with dirt or moisture. In addition, cast iron distributes loads evenly to resist wear and deformation over long-term use.
Proper installation and maintenance will maximize the lifespan of these sturdy bearings. In other words, you need to take proper measurements and pick the ideal pillow block bearings. It will help you maximize service life and prevent unexpected downtime of your machinery.
Do you wonder how to measure cast iron pillow block bearings correctly? Keep on reading and this guide will help you with it.
Identify the pillow block bearing type
There are three main types – single row deep groove ball bearings, self-aligning ball bearings, and roller bearings. Look for manufacturer markings on the bearing to identify the type. This will determine what dimensions need to be measured.
Measure the shaft diameter
Use a caliper or micrometer to accurately measure the shaft diameter that the pillow block will be mounted on. This should be measured at multiple points along the contact length to account for any deviations. Record the shaft diameter to help select the right replacement.
Measure outside housing dimensions
Use a caliper or metric ruler to measure the height, width and depth of the entire pillow block housing. Some bearings will instead specify an inside housing dimension, so take both measurements if indicated. This helps identify the bearing series and correct bolt hole spacing.
Determine bolt hole circle diameter
Use a metric ruler to measure the diameter of the circle formed by the centers of the mounting holes. There may be either 2, 4, or 8 holes. Use this dimension along with the bolt hole spacing to ensure an exact replacement.
Measure bore diameter
For ball bearings, use a telescope gauge or inside micrometer to accurately measure the inner diameter that the shaft fits through. The instrument should be able to measure around the entire circumference while inside the bearing.
Calculate radial and axial clearances
Pillow blocks are designed to have specific clearances or ‘play’ around the shaft. Calculate the radial clearance by subtracting the actual shaft diameter from the measured bore diameter. Use a feeler gauge to estimate axial end play. Record these measurements to get bearings engineered for the same running clearances.
Evaluate bearing condition if replacing
Inspect the bearing for signs of wear, fluting, pitting or cracking while going through the measurement steps. Gently rock the inner race back and forth by hand to feel for any roughness indicating wear. Documenting the current condition helps determine why it failed previously.
Now you have a clear idea of how to measure pillow block bearings. Follow these steps and your replacement bearings will ensure optimal operating performance. Ensure you don’t forget to record lubrication type and hours of operation as well. It can eventually help you overcome unplanned downtime.
This is where NSAR Bearings can help. We are a bearings manufacturer, who maintains a strong reputation by offering the highest quality cast iron pillow block bearings to the market. Follow the steps to take measurements, head to our website, and make your purchase today.
