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Benefits of Harperizers

Clean & Prepare Your Parts Up to 90 Times Faster With a Harperizer™

Harperizers are the high speed, high precision machines that started the concept of high energy mass finishing. When first introduced more than 30 years ago by Harper, the process of Harperizing revolutionized the finishing industry and began a new technology of high-energy mass finishing. The term Harperizing is synonymous with this process, and Harper continues to lead the way into the future of centrifugal barrel finishing.

Today more than 3000 Harperizers are in service around the world, a testament to their versatility and widespread acceptance. Innovations such as automated material handling systems, state-of-the-art electronics, and PLC controls have kept the Harperizer at the forefront of the mass finishing industry.

Eliminates Hand Finishing

Harperizers remove the need for hand finishing, increase your productivity, and produce a more uniform, consistent finish. Our technical department can help you determine the proper cycle times, G-force, and media selection.

Low Maintenance & Gentle Action

All Harperizers are engineered to meet the demands of industrial environments. Ease of maintenance and serviceability translate to years of dependable operation. Parts are continually encased in media during Harperizing, producing an aggressive, yet gentle action.

Very High Speed & Precision Finishing

Typical processing times of 5 to 30 minutes reduce per part cost as well as inventory, lead times, and required floor space. Maintain tolerances as low as 0.0001 inches.


Choose a Harperizer to meet any of the following needs:

Finishing Process

  • Descaling
  • Stress Relieving
  • Part Deflashing
  • Smoothing of Surfaces
  • Generating Edge & Corner Radius
  • Generating Compressive Stresses
  • Deburring
  • Material Removal
  • Surface Cleaning
  • Surface Refinement
  • Achieving High Micro Finish
  • Pre-Plate & Pre-Paint Finish

Send Us Your Parts or Prints

With over 3,000 Harperizers in service, our engineers can pick the right machine and the right process to meet your requirements. Send us your parts or prints, and we will improve your uptime.

Graph Representing Stock Loss in Minutes

Summary of the Harperizing Process

In the Harperizing process, a flywheel turret rotates at high speed while the individual drums are counterrotated. This places the mass under compression and generates friction against the drum wall. An abrasive action gently rubs the media against the parts while under the high G-force compression.

The sliding action is gentle as well as uniform and eliminates tumbling, cascading, or the pile up of media parts. The result of this action is a significantly accelerated process. Harperizing can be 90 times faster than conventional barrel tumbling and 30 times faster than vibratory finishing. Even the most delicate parts may be Harperized without damage or distortion.


Harperizers are available in various sizes and configurations including vertical or horizontal axes, and with fixed or removable drums. Capacities range from less than 1 cubic foot to over 30 cubic feet. Harperizers can be equipped with automated material handling systems to convey, separate, and load parts and media. They can accommodate parts as tiny as 0.003" diameter or massive forgings weighing over 250 pounds.