Four Ball Tester Machine By Innovative Instrumentz

We are Supplying Four Ball Tester Machines in Bengaluru, Karnataka, India. The measurement of Extreme-Pressure properties of a lubricating grease using the 4 Ball method is designated under the ASTM-D 2596. The purpose of this testing is to determine the load carrying capabilities of a lubricating grease under high load applications.

The 4 Ball EP test machine operates in a sliding or rolling motion. A single stainless steel ball rotates onto three stainless balls, all of which are completely coated with a lubricant film, or a boundarya , held stationary in the form of a cradle.

The ability of a grease to perform under extreme pressure conditions is determined by the load wear index (LWI). Three measurements go into determining the LWI. The first measurement, the last non-seizure load (LNSL), is the highest applied load that exists when there is still lubrication between the 4 balls. The load is then increased until the lubricant film no longer exists and there is metal to metal contact and the 2nd measurement, seizure region, occurs, Finally, the load is increased until catastrophic welding occurs, and the final measurement is determined, Welding can be detected if any of the following are noticed:
The friction-measuring device undergoes a sharp transverse movement. An increased noise level of the motor.Smoking from the ball pot
A sudden drop in the lever arm. An average ball scar over 4mm is recorded.Using the values of these parameters, the Load-Wear Index can be calculated