Abstract: An experimental mixing device may comprise a driving source, an eccentric member, a control member and a mixing member. The control member may be selective installed in the experimental mixing device and be configured to adjust the mixing member, thereby providing various operational motions of the mixing member, for example an orbital motion, a see-saw motion, a 3-D twist motion, or a crank motion. The use of the control member may eliminate the need of separating the mixing member from the experimental mixing device. Thereby, the experimental mixing device may have adjustable patterns and quantity of the mixing motion and lead to easy usage and manufacture.

Abstract: An experimental mixing device may comprise a driving source, an eccentric member, a control member and a mixing member. The control member may be selective installed in the experimental mixing device and be configured to adjust the mixing member, thereby providing various operational motions of the mixing member, for example an orbital motion, a see-saw motion, a 3-D twist motion, or a crank motion. The use of the control member may eliminate the need of separating the mixing member from the experimental mixing device. Thereby, the experimental mixing device may have adjustable patterns and quantity of the mixing motion and lead to easy usage and manufacture.

Abstract: A finger hole drilling machine for a bowling ball is disclosed. The drilling machine includes a ball seat assembly, an air suction/expelling valve unit, a marking pen assembly and a turntable assembly. The ball seat assembly has a ball seat housing of the box type for tilting the bowling ball forward and backward, and a ball seat movably placed on the ball seat housing and adapted for tilting the bowling ball leftward and rightward. The drilling machine identically drills the finger holes on a plurality of bowling balls of a bowler, thus to achieve identity of the finger holes of the bowling balls. The drilling machine also readily sets the drilling positions on the bowling balls, thus to save time and to readily finish the finger hole drilling work and to improve the efficiency of the finger hole drilling work.