Sherwood OF-40C butt end reducer

For further information on Sherwood OF-40C butt end reducer refer to Equipment Certificate (PDF) and general view.

A centering butt end reducing device designed for producing rounded logs with a long groove for blockhousing of the following diameters: 200; 220; 240; 260; 280; 300; 320; 340; 360; 380; 400 mm. The machine is equipped with two hydraulic actuators with elevated platforms for log lifting and adjustment (before fixing). A scraping (belt) conveyor for waste disposal may be mounted inside the frame. A hydraulic driven system of raw logs feed and finished product removal and a single-piece input system may be supplied additionally.

Rounding head drive start system implements "cushion start" that limits inrush current to maximum working current. "Cushion start" minimizes wear of mechanical parts of rounding unit and electric motor.

*Log lengths for basic configuration of OF-40C - 5950-6150 mm, we also manufacture custom lathes for other lengths (e.g. 4 or 5 m).

* Log shape variants (custom)


Sherwood OF-40C lathe Specification

Maximum butt end diameter of a processed log, mm 560
Rounding tolerance, mm, no more than 120
Log length, mm 5950-6150

Feed rate, m/min**
     working run
     blank run

0 - 3,2
Element diameter after rounding, mm

Maximum diameter deviation, mm
200, 220,240,260,280,300,

Rotation frequency, rpm
     Rounding head
     Cutter spindles

3 000

Drive power, kW:
     Rounding spindle
     Cutter spindle (compensatory notch)
     Cutter spindle (insulating groove)

1,1kW     1000 rpm
55kW     3000 rpm
15kW     3000 rpm
11kW     3000 rpm

Dimensions, mm:

10 550
1 950
2 000

Weight, kg, no more than

6 600
* custom value
** at maximum inverter frequency – 80Hz

Distinctive aspects of machine design and furnishing

- Three sets of cutting tools for the rounding unit.

- High quality bearings of the rounding unit.

- One set of outfit.

- Proximity displacement sensors.

- Moving back stock for processing logs of various length, from 4,5 to 6 m.

- High quality and strength foreign-made V-belts.


- 24V control circuits for higher electric safety of the equipment.

- Smooth start and stop system of rounding unit.

- We can manufacture machines for logs of 3 to 7,5 m in length to a special order.

 Sherwood OF-40C lathe application

Production of house building rounded logs with long grooves d 200 - 400 mm.

Recommended fields of application

Woodworking enterprises specializing in rounded log structures with yearly production rate of up to 6000 cub.m. of finished products with a 2-shift schedule.

Lathe description

Sherwood OF-40C butt end reducer for log rounding and grooving consists of the following units: frame with mounted lifting units, fixed and fixing stocks with console points, moving carriage with a mounted rounding rotor, two smoothing units and a carriage drive.

The machine operates as follows. The carriage is set up in initial position at the fixed stock. A log is fed to the frame, then it is lifted by means of hydraulic lifting mechanisms and centered. The log is fixed by the fixing stock (hydraulic actuated), and the lifting mechanisms go down. Rotor rounding mechanisms, cutter drives and carriage feed drives are activated. The log is smoothed and surfaced in a single run. Feed rate may be smoothly adjusted during processing. After processing the log is released and removed from the machine. The run is repeated for the next log processing.

Increased capacity is due to:

* mechanized log lifting and fixing;
* single-run processing;
* electronic feed rate adjustment device;
* unique carriage moving units and rotor cutting units that allow high-speed operation.

Higher quality is due to:

* heavy and rigid frame of channel No 40;
* electronic feed rate adjustment device for changing of feed rate in accordance with cutting conditions;
* unique rotor cutting units for smooth surfacing at high speeds.

The machine is more reliable and convenient thanks to hydraulic and electronic devices.

Advantages in comparison with similar devices

High capacity, multi-purpose. Quality log processing in a single run.

Reduced labor input and doubled labor capacity. Better product quality.

Additional information

A Sherwood OF-40C butt reducing device is designed for producing rounded logs and rounded logs with a long groove for blockhousing.

The manufacturer provides a 1 year warranty for all equipment

Tools, commissioning and start-up
All machines are equipped with cutting tools. An additional agreement for commissioning and start-up may be concluded.

Wood processed
This machine is designed for processing of round softwood and hardwood trunks of 3rd grade and above as per GOST 9463-72; GOST 9462-71.

The machine consists of the following units:
- Welded frame 10,5 m long with mounted fixed front and fixing (hydraulic) back stocks..
- Carriage with rounding and two smoothing heads moves along the frame on round guides. The carriage also has a feed mechanism. The logs are fed by chain drive, the ends of the chain are attached to the frame, and its sprocket is mounted on the carriage.
- Two hydraulic actuators with elevated platforms are mounted upright on the frame for log lifting and adjustment (before fixing).
- A scraping (belt) conveyor for waste disposal may be mounted inside the frame.
- A hydraulic driven system of raw logs feed and finished product removal may be supplied additionally.

Approximate capacity
Approx. 20 m3/1 shift depending on input diameter using 0,72 utilization rate for calculation.