WHM Wood Hammer Mill

Fine grinding for wood chips, sawdust and pre-sized biomass. Proudly made in Lebanon.

The Mechaniqua WHM Series is designed to reduce pre-sized wood and biomass into finer material for pellet preparation and other processing applications.

The WHM uses a rotating hammer system to break down material through impact. A replaceable screen controls the discharge opening, allowing the machine to be configured according to the required material size.

With more hammers than a comparable WCHM model, the WHM focuses on secondary grinding. Incoming material must already be appropriately sized for the grinding chamber.

Key Features

• Dedicated hammer-grinding system for pre-sized wood and biomass.
• Replaceable screens for different grinding requirements.
• Seven models with electric motors from 4 kW to 55 kW.
• Electric, gasoline, diesel and tractor PTO configurations.
• Replaceable hammers and screens.
• Manufactured in Lebanon, with local servicing and spare-parts support.

Suitable Materials

Material	Preparation requirements
Wood chips	Appropriately sized for the selected model
Small wood pieces	Within the machine’s approved feed dimensions
Coarse sawdust	Where further particle-size reduction is required
Leaves and straw	Suitability and preparation confirmed for the application
Dry agricultural residues	Clean, appropriately prepared material
Pre-shredded biomass	Consistent feeding and suitable screen selection

Logs, large branches and oversized wood pieces require initial cutting or crushing before entering the WHM. For these materials, consider the Mechaniqua WCHM or a suitable upstream chipper.

Remove nails, screws, stones and other foreign objects before processing. Contact Mechaniqua before using unusual, contaminated or treated materials.

How It Works

Stage	Process
Feeding	Pre-sized material enters the grinding chamber at a controlled rate.
Hammer grinding	Rotating hammers reduce the material through repeated impact.
Screening and discharge	Material passes through the installed screen when sufficiently reduced.

Smaller screen openings generally produce finer material while reducing production capacity. The screen does not guarantee identical particle dimensions, particularly with fibrous materials.

Model Specifications

Model	Electric motor	Approximate production capacity*	Typical application
WHM250	4 kW	80–150 kg/h	Small-scale processing
WHM330	7.5 kW	150–300 kg/h	Regular small production
WHM420	11 kW	300–500 kg/h	Commercial grinding
WHM500	15 kW	400–700 kg/h	Professional biomass processing
WHM600	22 kW	600–1,000 kg/h	Higher-volume production
WHM800	30 kW	800–1,400 kg/h	Industrial processing
WHM1000	55 kW	1,500–2,500 kg/h	Large-scale production

Capacities are approximate selection guidelines. Actual output depends on material type, density, moisture, incoming dimensions, screen opening, feeding consistency, hammer condition and available drive power.

Fine screens, including 3 mm screens, can significantly reduce throughput. The figures above are not guaranteed production rates through a 3 mm screen. Engine and PTO performance must be confirmed for the selected configuration.

Screen Selection and Pellet Preparation

The WHM can prepare suitably sized biomass for downstream pellet production.

• Smaller screen openings: finer grinding, generally with lower throughput.
• Larger screen openings: coarser output, generally with higher throughput.
• Pellet preparation: a 3 mm screen may be suitable where the pellet machine requires finely prepared feedstock.

Select the screen together with the required production rate and downstream equipment. Grinding does not replace drying; material moisture must remain suitable for the intended process.

Electric Drive Options

Model	220V DOL¹	220V VFD	380V DOL	380V star-delta	380V VFD
WHM250	✓	✓	✓	—	✓
WHM330	—	—	✓	—	✓
WHM420	—	—	✓	✓	✓
WHM500	—	—	✓	✓	✓
WHM600	—	—	—	✓	✓
WHM800	—	—	—	✓	✓
WHM1000	—	—	—	✓	✓

¹Motor type and electrical requirements for the 220V DOL version are confirmed when ordering.

Starting Systems

System	Characteristics
DOL — Direct-on-Line	Simple starting arrangement. Requires a supply capable of handling the motor’s starting current.
Star-Delta	Reduces initial starting current and starting torque. Requires a compatible motor and sufficient torque to accelerate the unloaded rotor.
VFD — Variable-Frequency Drive	Provides controlled acceleration and adjustable operating settings, configured for the motor and machine.

A VFD does not increase the motor’s rated power or compensate for an undersized electrical supply. Operate only within the machine-speed range specified by Mechaniqua.

Electrical Supply and Installation

380V Three-Phase Versions

The following values are preliminary planning guidance for DOL and star-delta installations.

Cable examples assume copper conductors, PVC insulation, one ungrouped surface-clipped cable, approximately 30°C ambient temperature and a cable route up to approximately 25 metres.

Model	Motor	Approximate full-load line current	Preliminary supply breaker²	Example supply cable³
WHM250	4 kW	8.5 A	16 A	4G2.5 mm²
WHM330	7.5 kW	15 A	25 A	4G4 mm²
WHM420	11 kW	21 A	32 A	4G6 mm²
WHM500	15 kW	28 A	40 A	4G10 mm²
WHM600	22 kW	40 A	63 A	4G16 mm²
WHM800	30 kW	54 A	80 A	4G25 mm²
WHM1000	55 kW	99 A	125 A	4G50 mm²

²Breaker ratings are preliminary candidates, not motor overload settings. Final selection must consider starting performance, trip characteristics, fault-breaking capacity and coordination with the cable and motor protection.

³4G means three phase conductors plus protective earth. Add a neutral conductor where required by the supplied control panel. These examples concern the incoming supply to the machine panel, not the motor leads from a star-delta starter.

A qualified electrician must verify the final installation. Longer runs, enclosed installation, grouped cables, higher temperatures and voltage-drop requirements may require larger conductors. Installed motor and control-panel specifications take priority.

WHM250 — 220V Single-Phase VFD Version

This configuration uses a suitable VFD to operate a three-phase motor from a 220V single-phase supply.

Specification	Preliminary value
Motor power	4 kW
Supply input	220V single-phase
Starting system	VFD
Estimated full-load input current	Approximately 23–25 A; verify against the selected drive
Preliminary supply breaker	32 A, subject to drive manufacturer requirements
Example supply cable	3G6 mm² copper under the installation assumptions above
Conductors	Line, neutral and protective earth

A dedicated supply is required. This version is not suitable for a standard 16 A household socket.

The 220V DOL version requires separate sizing according to its installed motor.

VFD and Motor Protection Requirements

For VFD-equipped machines, input cable and breaker selection must follow the actual drive’s rated input current and manufacturer requirements. Motor current alone is insufficient to size the VFD supply.

Motor overload protection must match the installed motor and starter arrangement. Maintain proper earthing, isolation and ventilation around the motor and control panel.

If the motor repeatedly overheats or exceeds its permitted continuous current, reduce feeding and investigate the cause before continuing production.

Generator and Solar Operation

Compatibility depends on voltage, phases, continuous supply capacity, starting capability and other connected loads.

Motor kW alone is insufficient to size a generator or solar inverter. Provide Mechaniqua with the supply equipment specifications so the appropriate configuration can be assessed.

Gasoline and Diesel Versions

Fuel-powered models are available for locations without an adequate electrical supply.

Model	Engine
WHM250	6.5 hp gasoline
WHM330	10 hp diesel
WHM420	15 hp diesel

WHM500 and larger models are available with electric or tractor PTO drive only.

Combustion engines must operate outdoors, away from enclosed working areas and building air intakes.

Tractor PTO Versions

PTO configurations are available across the WHM range.

Model	Preliminary suggested tractor engine power*
WHM250	15+ hp
WHM330	20+ hp
WHM420	25+ hp
WHM500	30–35+ hp
WHM600	45+ hp
WHM800	60+ hp
WHM1000	100+ hp

Tractor engine horsepower differs from available PTO horsepower. Final compatibility depends on available PTO power, operating speed, transmission ratio, material and required throughput.

PTO shaft, coupling, mounting, guarding and operating-speed requirements are confirmed for the selected machine.

WHM or WCHM?

Feature	WHM — Wood Hammer Mill	WCHM — Wood Crusher Hammer Mill
Processing system	Hammer grinding	Cutting disc with blades and hammers
Incoming material	Pre-sized chips and suitable reduced biomass	Branches and larger pieces within the model’s limits
Main function	Secondary grinding	Primary cutting followed by grinding
Hammer arrangement	More hammers for a comparable machine size	Hammers combined with a cutting system

Choose WHM when your material is already appropriately sized for hammer grinding. Choose WCHM when initial cutting is required.

Operation and Maintenance

• Start with the grinding chamber clear.
• Allow the rotor to reach its specified operating speed before feeding.
• Feed progressively and adjust the rate to the material, screen and available power.
• Keep screens and discharge paths clear.
• Inspect hammers, screens, belts and bearings regularly.
• Follow the supplied lubrication and maintenance instructions.
• Keep guards fitted during operation.
• Stop, isolate and wait for the rotor to stop completely before opening, cleaning or servicing the machine.

Select Your WHM

Contact Mechaniqua with your material type, moisture condition, incoming dimensions, required output and final particle size.

Also provide your available electrical supply, generator, solar-inverter or tractor specifications, where applicable.

Machine dimensions, weight, inlet dimensions, maximum feed size, rotor speed, screen availability and included accessories are confirmed in the technical quotation for the selected configuration.

Mechaniqua — Dhour Choueir, Lebanon
Phone / WhatsApp: +961 71 612071
Email: mechaniqua@gmail.com