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PR Hoffman

PR Series

Servo RS Series

The PR Series of double-sided planetary lapping and polishing machines have a time-proven design. With thousands of machines built, the dependability, versatility, ease of operation, and low cost of ownership of the PR-Series machines is tough to beat. The PR machines are well-suited to laboratory, research and development, as well as production environments.

The base PR Series machine design employs a non-rotating top and bottom plate, variable-speed outer ring gear and center sun gear drive, and down force generated by the freely floating top plate. The planetary action simultaneously removes equal amounts of material from both sides of the parts being processed.

The PR Series machine configurations provide capability for a broad spectrum of precision processing requirements on parts that are thin and fragile, parts that have a high aspect ratio, and parts that have a low surface area. The rugged machine construction withstands harsh environments and provides a stable platform for producing flat and parallel parts. Additionally, we offer a range of optional features as well as design customization to satisfy the individual needs of our customers.

PR-1

PR - 1

Capacity Chart

Equipment

  • Choice of four carrier (work holder) configurations: (13) 32 tooth, (8) 50 tooth, (5) 66 tooth, or (5) 85 tooth
  • Smooth cast iron plates
  • Stationary bottom plate
  • Floating, non-rotating top plate
  • Cast iron ring and center gears
  • Driven by single variable speed motor
  • Mechanical transmission drives the outer ring gear and center sun gear at fixed gear ratio
  • Bottom plate height adjustment mechanism

Control console

  • Illuminated start/stop selector switch, master speed control knob, manual or timer control selector switch, emergency stop pushbutton and main disconnect selector switch
  • Digital timer function, machine speeds, and motor loads are incorporated into touch screen operator interface

Provisions for raising and lowering the top plate

  • Top plate handles and a post and hanger for storing the top plate on the 32T, 50T and 66T configurations
  • Top plate lifting device operated by 2-hand safety control pushbuttons and pneumatic system on the 85T configuration

One year warranty

PR-2

PR - 2

Capacity Chart

Equipment

  • 32 tooth carrier configuration
  • Smooth cast iron plates
  • Stationary bottom plate
  • Floating, non-rotating top plate
  • Cast iron ring and center gears
  • Driven by single variable speed motor
  • Mechanical transmission drives the outer ring gear and center sun gear at fixed gear ratio
  • Overrunning clutch provides soft stop at end of process cycle and allows operator to manually rotate ring and center gears
  • Bottom plate height adjustment mechanism
  • Post and hanger for storing top plate when machine is not running

Control console

  • Illuminated start/stop selector switch, master speed control knob, manual or timer control selector switch, emergency stop pushbutton and main disconnect selector switch
  • Digital process cycle timer control

Top plate manually raised and lowered onto parts being processed

One year warranty

SERVO RS Series

In 1990, PR Hoffman introduced the Servo-RS Model 1500, the first machine in its new Servo RS™ series. The design of this machine series drew from over 50 years of experience with developing and building double-side planetary lapping and polishing machines. In the following years, we have expanded and refined the family of Servo RS Machines to include the model 1900, 3100, 5400, 6600, and 7600 double-side machines, which feature nine carrier work holder sizes that range from 2.5” (64mm) to 27.7”(703.6mm) in diameter.  In addition we have our SSP-619 single-side polisher for work pieces up to 18”(450mm).

The base machine designs in the Servo RS™ series all employ a fixed bottom plate, independently programmable rotating top plate, center gear, and ring gear, and precise, servo-controlled down force control. We also offer a counter-rotating 4-way machine design option on the 1900 and 3100 models. All machine motions incorporate advanced drive technologies for precise control and high efficiency.

All Servo-RS machines utilize a common motion controller and Windows PC-based software with touchscreen interface. They offer a range of optional features as well as design customization in order to address individual needs of customers.