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Particle Size Reduction Machines

What is Particle Size Reduction?

"Adding energy to a material to make large pieces smaller"

Energy + Material = Size Reduction

Different types of particle size reduction equipment are available and each has its own method of reduction. The right size reduction machine for the task is the one that can add energy most efficiently for the application.

From the beginning of time, humans have found it necessary to make little pieces out of big ones – stone, ore, ice, grain and more. It was a slow, laborious process for many centuries. Then in the Stone Age came the first breakthrough – we call it a hammer – and it worked better than ever. It worked so well, in fact, that it's still one of the most widely used tools in the world.

Today, there are many different size reduction machines available to make little pieces out of big ones. Particle size reduction equipment includes primary impact crushers and secondary crushers as well as milling machines - cage mills, hammer mills, pulverizers and grinders.

Stedman manufactures a full line of particle size reduction equipment — primary impactors, secondary crushers, tertiary impactors, plus cage mill pulverizers, hammer mill crushers and lump breakers for the aggregate, mining and industrial markets. Materials processed fall into broad categories including abrasive, non-abrasive, wet or dry, sticky and friable. Stedman's experience evaluating these factors helps target the correct size reduction equipment for each unique project.

Size Reduction Machine FAQs

As you look for particle size reduction equipment, if you have the answers to the following basic questions, a good, experienced supplier can help you maneuver through designing the best equipment for your application. Begin by answering these five questions:

  • What raw material will be crushed?
  • What's the raw material's moisture content range?
  • What's the raw material's particle size range?
  • What production rate should the size reduction equipment achieve (in pounds per hour, tons per hour, or kilograms per hour)?
  • What particle size range must the final product have?
For processes that require frequent changeovers, particle size reduction machines with a wide range of process control and operating flexibility are the answer. Whether the materials are friable or not will affect the type of particle size reduction equipment that’s optimal. In addition to material type, the starting and final size of the milled material drives the mill selection process. Contact the experts at Stedman Machine Company to discuss which size reduction machine is best for your application.

Test Before You Buy™

The Stedman Testing and Toll Processing Facility is the place to test your material in our full size equipment. If it can be crushed, ground, pulverized or mixed, chances are we’ve done it. We have more than 10,000 test reports to help get you to the best solution quickly. To learn more about what to expect from testing, read our article that ran in POWDER BULK ENGINEERING magazine.


Why Stedman?

Delivering equipment and service you deserve

For nearly two centuries, Stedman Machine Company has produced quality, reliable and durable size reduction and industrial crushing equipment. Stedman has expert field service and installation technicians ready to assist with all maintenance and equipment commissioning needs.

  • Unsurpassed industry experience – operating since 1834
  • State-of-the-art equipment testing facilities
  • Dedicated, professional staff
  • Parts and service available 24 hours a day


Learn More About Our Particle Size Reduction Equipment:

Impact Crushers

Impact size reduction incorporates striking to pulverize material. The primary types of impact crushers include horizontal shaft impactors (HSI), cage mill pulverizers, and vertical shaft impactors (VSI).

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Cage Mills & Pulverizers

Invented by Nathan P. Stedman, a cage mill is an internally fed impactor that crushes grinds or pulverizes many different materials to specified degrees of fineness.

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Hammer Mills

A hammer mill is a crusher that can grind, pulverize, and crush a wide range of materials. This crusher employs a rain of hammer blows to shatter and disintegrate the material.

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Lump Breakers

Lump-breaking equipment is able to reduce lumps created in the production, storage or transportation of bulk solids and powders - without generating excessive dust and fines.

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Used Impact Crushers

Stedman brings used equipment back to their former glory through extensive factory reconditioning.

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Custom Reduction Systems

Stedman has the engineering experience to design, manufacture, and install custom crushing and material handling systems.

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or call us at (812) 926-0038