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Koehler K93100 Four Ball Tester
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Last Updated
31 Oct 2019
Country Origin
United States
Minimum Order
1 unit

Specification of

Test Method

Determines the Wear Preventative (WP) and Extreme Pressure (EP) characteristics of lubricating oils and greases in sliding steel-on-steel applications. The test consists of rotating a steel ball under load against three stationary steel balls coated with lubricant. Measurements are taken at the rotating speeds, temperatures, and duration as specified by published standards. The load-wear index can be calculated from the weld point in EP tests, and lubricant comparisons can be made based upon scar diameters incurred from wear tests.

Specificatons

Conforms to the specifications of: ASTM D2266, D2596, D2783, D4172, D5183*, IP 239

Drive Motor: 1.5 kW

Test Speeds: 1200, 1440, 1760 rpm

Optional Test Speeds (min/max): 1000/3000, 300/3000 rpm

Maximum Axial Load: 10000 N at 3000 rpm or 12000 N at 1800 rpm

Test Duration (min/max): 1/9999 min
Test Ball diameter: 12.7 mm

Description

Four Ball Tester performs both Wear Preventative (WP) and Extreme Pressure (EP) analyses for measuring the wear and frictional properties of lubricants under sliding steel-on-steel test conditions. Tests are performed in accordance to the latest ASTM and IP published methods. Normal load on the ball assembly and frictional torque are measured through load cells. Data is processed and stored using an advanced data acquisition and processing software package. Test results can be plotted and compared, as well as exported to other programs. Wear scars on the steel balls are measured and recorded with a High Resolution Digital Microscope available as recommended accessory for the Four Ball Tester. High Resolution Digital Microscope Koehler's Four Ball Microscope is a versatile device for measuring the wear scar diameter on a steel test ball. This apparatus consists of the “Dinolite” Microscope with “DinoCapture” Software mounted at an angle on an aluminum base. The device is designed to measure the wear scar without removing the test balls from the ball pot allowing for a safer measurement procedure. The wear scar can be viewed through an external PC. The software measures the wear scar using a diameter and line tool. The images can be saved at varied resolutions on a PC.

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