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The Y Swim Center in Randallstown. New Year's Eve: New Year's Day: 5:00am - 12:00pm. Independence Day: 5:00am - 12:00pm. 5:00am - 12:00pm. 3505 Resource Drive Randallstown, MD 21133. The Y Swim Center in Randallstown. Save as preferred Y Center. MORE THAN A MEMBERSHIP. An opportunity to be active, reconnect and get involved.The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed .