TPT July 2021

I NDUS T RY

George A Mitchell Company to supply specialist push pointer for cold drawing steel tubes

GEORGE A Mitchell Company, based in Ohio, US, has been contracted to supply a 33,000lb Five Die Rotary Hydraulic Push Pointer for a US manufacturer of cold drawn steel tubes. Mitchell has produced over 60 Rotary Die Head Push Pointers of various capacities over the last 58 years of business. A Rotary Die Head Push Pointer is used when more than three

dies are needed to accomplish a specific schedule of point reductions prior to the cold drawing operation. They are usually used for aluminium or copper material. It is highly unusual for steel tube to require more than three reductions, but the customer has certain unique high D/t ratio products that requires up to five reductions. The rotation of the indexing die head is carried out via the use of a servo motor and drive system. The servo system allows infinite rotational adjustment and near perfect angular accuracy. The original device Mitchell used for Rotary Die Heads was a rotary cam indexing mechanism driven by a hydraulic motor. These devices have proven to be very expensive and costly to maintain. In other special applications, the servo motor system allows

for varying angular positions, whereas the rotary cam indexing devices used previously could only achieve equal angular positions. One major safety advantage of the servo motor system is, during a die change, the Rotary Die Head can be rotated without requiring the hydraulic pumping unit to be running, which facilitates a very fast and safe method for die change. Mitchell also recently delivered a 33,000lb, Five Die Rotary Hydraulic Push Pointer used for copper tubes; a 50,000lb Five Die Rotary Hydraulic Push Pointer for copper tubes; a 150,000lb Four Die Rotary Hydraulic Push Pointer for aluminum tubes; and a 150,000lb, Six Die Rotary Hydraulic Rod Push Pointer for solid superconductor rod.

33,000lb Five Die Rotary Hydraulic Push Pointer serial number PP-734

George A Mitchell Company www.mitchellmachinery.com

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JULY 2021