Shimpo Ball Mill for 1 JarBall mills have been used for decades to grind and mix materials used in the ceramic industry. SHIMPO's heavy duty ball milling machines enable very precise milling, in porcelain jars, even for relatively tough materials, wet or dry. Shimpo ball mills have a compact design that is ideal for small scale production and is constructed using powder coated steel for long lasting durability. The PTA 01 accommodates one jar, the PTA 02 can handle two jars.