**Analysis of Testing Skills for Bearing and Shaft Cooperation** Home > Bearing Knowledge > Analysis of Testing Skills of Bearing and Shaft Cooperation *Created on 2018/5/16* var cpro_id = "u3440131";

Analysis of the Testing Skills of Bearing and Shaft Cooperation

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/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';

Proper cooperation between a bearing and a shaft is essential for smooth operation and long-term performance. One of the key aspects to check is the radial clearance, which can be measured using several methods. The first method is the **ruler detection method**, typically used for bearings with larger diameters where the clearance is more significant. A narrow feeler gauge can be directly inserted to measure the gap. For smaller diameter bearings, where the clearance is minimal, this method may not be precise enough. In such cases, other techniques are preferred. Another commonly used technique is the **lead wire method**, which offers higher accuracy compared to the feeler gauge but requires more steps. The lead wire used must be soft and of appropriate thickness—usually about 1.5 to 2 times the expected clearance. In practice, soft lead wires are most often used for testing. To perform the test, open the bearing cover, cut a piece of lead wire (about 15–40 mm in length), and place it on both the journal and the upper and lower parts of the bearing. Then, replace the bearing cover and tighten the bolts according to the specified torque. After loosening the bolts and removing the cover, use a micrometer to measure the thickness of the flattened wire. The average value obtained represents the top clearance of the bearing. If the clearance is too small, the bearing may need to be adjusted by increasing the pad or scraping the surface. If it's too large, you may need to reduce the thickness of the pad, scrape the bearing surface, or even recast the bearing tile. In addition to checking the radial clearance, it’s also important to ensure proper **bearing bushing force**. This helps prevent unwanted movement during operation. The method for measuring the bushing force is similar to that of the radial clearance: a soft lead wire is used to determine the amount of deformation after tightening. The typical range for bearing bushing force is between 0.02 mm and 0.04 mm. If the pressure does not meet specifications, the gasket thickness at the joint between the bearing and housing can be adjusted accordingly. However, padding should never be added to the back of the bearing tile. Axial clearance is another critical factor. To measure it, position the shaft so that it is aligned with one end, then use a feeler gauge or dial indicator to measure the movement from one end to the other. This gives the axial clearance. When the sliding bearing clearance does not meet the required standards, adjustments must be made. Split bearings are often used to fine-tune the radial clearance. --- **Related Bearing Knowledge** - Common knowledge about "active bearings" - Application analysis of wind turbine gearbox bearings - SKF bearing installation on lathes - Precautions for NSK tapered bore bearings This article is sourced from [China Bearing Network](http://). Please reference the original source when sharing. Previous: The selection of smooth grease for bearings Next: Analysis of skate bearings

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