By Henrik Norsker
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Extra resources for Glazes — for the Self-Reliant Potter: A Publication of Deutsches Zentrum für Entwicklungstechnologien — GATE. A division of the Deutsche Gesellschaft für Technische Zusammenarbeit (GTZ) GmbH
For this reason, it is a wise investment to purchase a timer switch for the mill. This will avoid human errors. Too much ball milling can cause glaze crawling. Operating procedure Before each operation: 1) Check that the ball mill is clean inside. 2) Check that pebbles fill half of the ball mill- refill if necessary. 3) Fill in materials (20-25% of mill volume). 4) Fill water until pebbles and material are just covered. 5) Be very careful about correct ball milling time. If possible, use an automatic timer.
Ball milling time Charge With a speed of 60 - 80% of critical speed the charge should be: (by volume) 45 - 55 % Pebbles: 12-20% Water: 20-25% Material: When the mill is filled to maximum capacity, the speed should be closer to 60% of critical speed. The water content should be enough to produce a thin slip. After filling, about 30 % of the volume should remain empty. If you measure all the materials separately, total volume may seem to be 85% of ball mill capacity. However, since the water and material fill the spaces between the balls, this will still result in 30% empty space.
G. 5. Weighing is more accurate than using a hydrometer. do it as well as an experienced glazer. B Hydrometer made from a glass test tube. After you find out the correct amount of water by trial and error, the specific gravity can be measured and future batches of the same glaze made to the same specific gravity. C Glaze density is measured with a homemade hydrometer.