Specification of Thread

  • 7/8-40 Thread
  • 40 Revolutions to Unscrew

If Cylinder Activated

  • 1" Pitch Diameter Gear on Core
  • Requires almost 10.5 feet of rack and cylinder
  • Requires almost 5.25 feet of rack and cylinder, with a space consuming 2:1 planetary system

Cylinder Activation is Unacceptable

PERC, which stands for Programmable Electric Rotating Core, is a compact, high speed, high torque and high precision system utilizing programmable servo motors in place of hydraulics for unscrewing applications.

Leading tooling designers and OEMs have already realized the many advantages of utilizing this patent-pending system versus conventional hydraulic unscrewing systems. PERC opens up new ways to mold threaded parts more profitably.

Below, explore the many advantages of incorporating the PERC system from B A Die Mold into your next tooling project, or call us at 630-978-4747 to speak with a B A representative.

Side by Side Comparison

Typical unscrewing system with a hydraulically operated rack The same mold with the PERCtm system
Hydraulic unscrewing mold The same mold with a PERC unscrewing system

Hydraulic Systems

The PERCtm System
  • Motion limited by the length of cylinder stroke
  • Time consuming set-ups and frequent maintenance
  • Molds with hudraulic systems will sometimes require larger molding presses
  • Messy hydraulic hoses and connections
  • Requires auxilary equipment with electric molding machines
  • Accurate, fast and efficient core positioning with unlimited turns and programmable speed profiles
  • PERC's compact size makes for fast and easy setups
  • Allows for use of smaller presses
  • Eliminates messy hydraulic oils
  • Perfect match for electric molding machines

PERC Schematic

Schematic of a PERC system

PERC Renderings

Rendering of a 2 cavity, double unscrweing PERC system

Pictured above is a hot-tip hot runner mold that uses our patented PERC™ system. Our PERC™ servo unscrewing system enables this mold to form threads with two different pitches using only one motor to drive the cores. Our mold and PERC™ system replaced a traditional hydraulic motor unscrewing system resulting in a vast improvement in cycle time, core position accurate, and overall mold size (reduced size for a smaller press).

Rendering of an 8 cavity, parting line unscrewing, PERC system

Rendering of an 8 cavity PERC system

These (8) cavity hot runner mold features B A Die Mold's PERC™ (Programmable Electronic Rotating Core) system. The threaded cores are controlled by a programmable electric servo motor and control system.