Optimizing hammer mill performance through screen selection and .Tests conducted using a HG200 hammer grinder indicate that tip speed, screen size and . Size reduction. The most common mechanical preprocessing tech- nologies focus on size reduction and include hammer and knife milling/grinding, chipping, shredding and .. to determine if there are indeed strategies that can be.what determines the screen size in grinding in a mill,Screen Mills | Bradley Pulverizer CompanyThe mill speed can be altered to match the grinding force to the material being ground and the powder escapes from the mill through the surrounding screens. The product size is determined by the size of screen mesh fitted to the mill, and can be changed within an hour. Automatic feed control keeps product size consistent.