Stokes Model 550

Single Sided Rotary Press

Compacting Press

The Stokes Model 550 presses are a line of 12-ton single-sided rotary presses designed for compacting a wide range of shapes required by the pharmaceutical, powder-metal and ceramic industries.

Designed for Quality Products

Simplified adjustments, through conveniently positioned handwheel controls, allow adjustments of weight and thickness during operation in order to optimize compact quality. The presses' closed grid feeders feature a series of pins mounted at the bottom of the frame, which encounter materials as they feed through causing a cascading effect that drives materials into the die cavities. Adjustable gate controls at the rear of the frames permit a consistent material flow rate through the feed stations.

Transit-level feed supports facilitate front-to-back and side-to-side positioning of the feed frame. Two piece precision-machined rotary heads provide accurate tool alignment and guidance that extend tool life. A lower punch leveling system compensates for tool wear and allows use of reworked lower punches. Feed hoppers, fabricated from stainless steel and arranged with vertical adjustments and lock systems, provide control of material flow to the feed frames. The pneumatic pressure / tonnage indicator system permits easy and accurate adjustment of pressure while easily determining tonnage applied. This system includes an automatic motor shut down if the pre-set load is exceeded.

Simplified Servicing / Cleaning

Press components are removable for easy service and cleaning. The sectionalized camming, head spindle, steel worm and headgear are easily removed should replacement be necessary. The die table has a highly polished surface finish for cleaner operation and less material loss. A closed tunnel feed frame suppresses dust and extends the time interval between cleaning. Dust nozzles positioned above and below die tables at compression stations remove dust resulting in a cleaner operation.

Operation Safeguards / Conveniences

A multiple disc-type clutch is a low-effort manually actuated feature, which reduces high torque loading of drive components. Mechanical / electrical interlocks reduce the possibility of accidental startups. Guards surround the rotary head, work areas, belts and handwheels. The guards are locked into position to prevent removal without tools.

Options for Increased Versatility

All Model 550 presses can be arranged with the following features to meet the requirements of special applications.

  • Shadow-fill systems minimize excessive punch stroking and reduce recirculated granulation. This feature contributes to uniformity between compact weight and clean operation.
  • Abrasive resistance hardened die table surface, removable upper and lower punch bushings.
  • A core-rod system provides the capability to produce compacts with blind holes and / or through-holes.
  • Keywayed punch sockets provide necessary alignments for irregularly shaped tooling.
  • Adjustable upper rolls allow compacts to be formed at various levels in the die and extend tool life. This feature is vital for the production of flanged-type compacts.
  • Punch restrainers prevent excessive vertical movement of the lower punches. Benefits include extended tool life, uniform compact weight and minimization of double logo impressions.
  • Electronics can include industry standard explosion proof motors and controls.
Technical Specifications:

Model Number 550-1 550-2 550-3
Max. Operating Speed (compacts/min.) 600 640 600
Tooling Stations 15 16 15
Max. Compact Diameter (in.) 1-3/16 1-5/16 1-3/16
Fill Depth - Range (in.) 1/8 - 1 1/16 1/8 - 1 1/16 1/8 - 1 1/16
Max. Oper. Pressure (tons) 12 12 12
Adjustable Range (tons) 0-12 0-12 0-12
Upper Punch Entrance, Standard (in.) 1/4 1/4 1/4
Upper Punch Entrance, Optional (in.) 1/8 - 3/8 1/8 - 3/8 1/8 - 3/8