AK 640 High-Speed Grinder

Maximize Volume, Revenue and Profit.

Meet the new yard boss: the AK 640 high-speed grinder. Built with the same collection of innovative features as all Doppstadt® AK series high-speed grinders, the AK 640 grinder is a high-volume machine designed to produce hundreds of yards of finished material every day. The up-swing hammermill engineering converts more of your source stream into a very consistent, high-quality product, maximizing your revenue and profit.

Organics, shingles, wood waste, C&D — you can grow your business on the back of the AK 640.

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The patented Doppstadt load-sensing scraper floor that feeds the hammermill.

An orange Doppstant AK 640 grinder is loaded with waste wood to be ground into wood chips.

A rotating drum with sharp teeth grinds down green waste to produce mulch.

An orange Doppstant grinder sits among waste wood, grinding down pallets into wood chips.

An orange Doppstant AK 640 grinder sits in front of a large pile of green waste and wood waste.

Product Features

Hinged Radiator

The hinged radiator is easily accessible and includes an automatic reversing fan.

Feed Roll

A reversible feed roll ensures material is consistently and evenly fed to the grinding chamber.

Upswing Rotor

The large 2.5-ton rotor with easily replaceable tips grinds the material. Extra contaminant protection is provided by the free-swinging design.

One-Piece Sizing Screen

Mesh screens from 1″ – 16″ can be easily replaced in 10 minutes or less, allowing for quick product sizing changes.

Rear Conveyor

Material is discharged via rear conveyor. Add an optional magnetic pulley or overband magnet to remove ferrous metals.

Large Access Doors

Large maintenance doors provide easy access to all critical components and functions of the machine.

Scraper Floor

The patented, load-sensing scraper floor ensures material is evenly and consistently delivered to the feed roll.

Remote Control

All machine functions can be controlled by a wheel-loader operator using the optional 16-channel remote control.

Ak 640 Demonstration

Interested in the Doppstadt AK 640 High-Speed Grinder? Contact us to arrange an on-site demonstration at your facility, running your material, to see just how good it is!

Case Studies

Start-Up Metrosite Builds Recycling Leader in Less than One Year

July 6, 2018

Scott Ledford took the back roads into the organics recycling industry—literally. As the owner of a communications tower construction company, he spends considerable time doing work in rural Georgia communities.…

Mulch Producer Making a Statement with Business Mission