Written by Paul Montgomery, Marketing Leader at PRAB. Reviewed by Mike Hook, VP of Sales. Published July 22, 2026. Last updated July 22, 2026.
| Quick Answer: Shredders, bundle breakers, and horizontal-axis crushers all condition low volumes of metal turnings into flowable chips, but they do it differently: shredders shear the material, bundle breakers tear it apart, and crushers rip and grind it. Vertical-axis crushers, rolling-ring crushers, and hammer mills handle much higher volumes and produce finer, thumbnail-sized chips or powders. The right choice depends on your scrap form, volume, and whether solids like bar ends are mixed into the stream. |
Metal scrap reduction equipment all aims at the same outcome, smaller, more flowable chips instead of bulky tangled turnings, but the mechanisms and the right-fit scenarios differ enough that picking based on name recognition alone tends to backfire.
Low-Volume Conditioning: Shredders, Bundle Breakers, and Horizontal-Axis Crushers
These three modify low volumes of metal turnings into chips ready for downstream processing, but each handles the job differently, a distinction detailed by PRAB’s own VP of Sales, Mike Hook, in a *Production Machining* technical brief on scrap processing equipment selection. Bundle breakers condition bushy wads so augers and conveyors can transfer material that would otherwise bounce around an in-feed hopper, and can also free solid parts or bar ends trapped in a bundle. Metal turnings shredders and horizontal-axis crushers need scrap to already be semi-flowable, but in exchange they provide continuous volume reduction right at the source. All three typically run on low-speed, high-torque drives in the 2 to 10 horsepower range, which helps keep energy costs down.
High-Volume Reduction: Vertical-Axis Crushers, Rolling-Ring Crushers, and Hammer Mills
This second group handles material too large for conveyors and operates at higher speeds with continuous positive-feed operation, producing flowable, thumbnail-sized chips or, in some cases, fine powders. Vertical-axis crushers sit on the lower end of this throughput range, with motors typically rated around 20 horsepower, though multiple units can run in parallel where floor space allows. Rolling-ring crushers and hammer mills handle the highest volumes, with motors upward of 50 horsepower.
Why the Distinction Matters for Your Operation
Choosing between these categories is not about which sounds more powerful, it is about matching the equipment to your actual scrap stream. A shop producing low-volume, stringy turnings with occasional bar ends mixed in needs a bundle breaker or shredder, not a hammer mill sized for continuous high-volume feed. A high-volume operation processing large quantities of scrap too big for a conveyor needs the heavier-duty crushing category, since undersized equipment will bottleneck production rather than solve it.
What All of This Reduction Work Is Actually For
Regardless of category, volume reduction serves the same downstream goals: decreased storage needs, lower transportation costs, and improved value from a scrap recycler. It also protects downstream equipment, since wringers, centrifuges, and briquetters all perform better on consistently sized, flowable chips than on tangled, unpredictable turnings.
Further Reading
- Editorial: Is It Time to Update Your Scrap Processing Equipment? by Mike Hook, Production Machining
- Technical Brief: Briquetter Systems
- Guidebook: How to Select the Right Metal Chip Processing System
Not sure which category fits your scrap stream? Request a materials test to find out before you buy.
About the Author: Paul Montgomery is the Marketing Leader at PRAB, Inc., bringing more than 20 years of B2B marketing leadership experience, including CMO and VP roles where he drove measurable growth such as 300% year-over-year revenue increase and an 83% reduction in customer acquisition costs. At PRAB, Paul leads SEO/AEO strategy and content development across the company’s metal scrap and fluid recycling equipment lines.