Machinery Lubrication magazine published by Noria Corporation
Issue link: https://www.e-digitaleditions.com/i/229047
GREASES Applications Early applications of these gages were seen in the pharmaceutical and paint industries, which had issues determining the fineness of particles in suspension. For example, in the paint industry, the earliest method for inspecting dispersion quality involved obtaining a small sample of the product to test for particle fineness. Testing in this manner had its drawbacks because it required considerable experience and agreement between testers to predict the final product quality. To assist testers in determining dispersion quality, the North Standards were developed. These were actual pigment dispersions covering a broad range of grind quality. A sample was checked by comparing it to the selected standard on a glass plate. The grease sample is deposited at the deep end of the gage block. The wiper is pulled down the length of the block with even pressure. so that it can be distributed evenly over the length of the block. Hold the wiper blade perpendicular to the block and pull the blade down the length of the channels with a smooth, even stroke. Once the grease has been spread down the channels, hold the block at an angle to a light source to check for particle concentration and type. In order to eliminate the dependence on standard samples, the Hegman grind gage was developed in 1938. It is now used in a variety of fields, including the food, pharmaceutical, pigments, plastics and paint industries. In all of these applications, Hegman gages (sometimes referred to as grind gages or grindometers) are utilized to produce, store and apply dispersion products. Using the Gage To use the gage, start by placing the device on a flat surface. This will allow even pressure to be applied on the wiper blade during the testing process. Spread the grease to be tested on the deep end of the channel and be sure to use enough grease The wiper blade is used to wipe the sample down the block. 30 November - December 2013 | www.machinerylubrication.com The raceways are examined for evidence of contamination. Skid marks left in used grease indicate hard contaminants.