The Minster E2H HeviStamper utilizes twin helical gears in both its single and double geared arrangements. The advantages of Minster's twin drive arrangement include:

• Improved slide parallelism throughout the working portion of the stroke.

• Virtual elimination of torsional deflection between connections and main bearing maintaining slide parallelism through the working portion of the stroke.

• Improved dynamic parallelism when subjected to off center loading.

• Decreased punch penetration in snap-thru conditions as a result of twin drive having only 1/2 of torsional wind up of a typical center drive press with the same size shaft.

In addition twin drives provide increased gear life and reduced noise compared to presses utilizing spur gears; and improved gear timing and serviceability as a result of mounting the gears to their shafts without keys.


Torsional Wind-Up Comparison (illustration above)
Finite Element Analysis proves that vertical deflection of a center drive is twice that of a twin drive when maximum rated torque and tonnage are applied evenly to each connection. This results in less stiffness and increased punch penetration in snap-thru applications on a center drive machine.