Log Multi-Blade Saw Selection Guide: From Processing Requirements to Core Component Configuration

In the wood processing industry, the log multi-blade saw has become a core piece of equipment in the pre-sawing stage of production lines for blockboard, finger-jointed boards, and similar products. With specifications ranging from light-duty to heavy-duty models available on the market, matching the right machine to actual processing requirements—and understanding the configuration differences in core components—is key to improving yield and production efficiency. Using the CRS series log multi-blade saw as an example, this article covers four areas: processing diameter, core components, feeding and safety, and the selection procedure, as a reference for procurement decision-makers.

The first step in selecting a log multi-blade saw is matching the log diameter range. This series covers a processing diameter of 60–500 mm, with different models corresponding to different blade specifications and power configurations, as shown below:

As the table shows, saw blade diameter, spindle power, and machine weight increase progressively with processing diameter. For small-diameter logs of 60–200 mm, an entry-level model is sufficient, suitable for fast-growing woods such as pine, fir, and poplar. For medium-diameter logs of 150–350 mm, models with 410–480 mm blades and 37 kW×2 spindle power are required. For large-diameter long logs of 300–500 mm, a 650 mm blade paired with 55 kW×2 spindle power is needed, with machine weight reaching 3800 kg to ensure cutting stability.

Choosing within overlapping diameter ranges: The 150–350 mm and 300–500 mm ranges overlap at 300–350 mm, and the 60–200 mm and 150–350 mm ranges overlap at 150–200 mm. Three factors guide selection at boundary diameters: first, wood hardness—hardwoods such as rubberwood and acacia are better matched to the next size up; second, daily output requirements—when capacity demand approaches the upper limit, choose the larger model; third, the proportion of long logs—for logs over 4 m, the larger model’s spindle rigidity and feeding stability offer better assurance.

Capacity data qualifications: Capacity figures in the table are based on pine, standard feeding speed, and a conventional number of blades. Actual capacity is affected by wood density, feeding speed, blade count, and operator skill; it will decrease somewhat with hardwoods or high feeding speeds. A 10%–20% margin should be reserved during selection.

The cutting accuracy and service life of the equipment depend largely on the machining quality of the spindle system. The spindle is made of 40Cr steel with quenching and tempering treatment, significantly enhancing rigidity and resisting bending under impact loads. Paired with imported high-precision, high-speed waterproof bearings—matched to the spindle sleeve at the same precision grade—the spindle system offers wear resistance, high-temperature resistance, strong load-bearing capacity, and long service life. The spindle sleeve itself undergoes tempering treatment and precision grinding, improving both strength and toughness, effectively reducing wear during use and ensuring long-term machine stability and cutting precision.

The transmission system also merits attention. The machine’s chains primarily use a short-pitch design, featuring slow wear and enhanced durability, and all are of oversized design to extend service life. Sprocket tooth tips undergo quenching treatment for both hardness and toughness. Gears are made of alloy steel and carburized, offering wear resistance and impact resistance, keeping the equipment stable during prolonged high-load operation.

Yield and saw kerf loss: One of the core values of a multi-blade saw lies in controlling saw kerf loss. Blade thickness directly determines kerf width—the thinner the blade and the narrower the kerf, the higher the yield. For example, a 305 mm blade at 2.6 mm thickness loses about 2.6 mm per kerf; if one pass produces five boards, cumulative loss is about 13 mm. A 650 mm blade at 6.5 mm thickness loses more per kerf but corresponds to efficient processing of large-diameter logs. During selection, balance blade rigidity (thickness) against yield (thin kerf): thin blades can be prioritized for small-diameter fast-growing wood to improve yield, while large-diameter hardwoods require sufficient blade thickness to maintain cutting stability.

Smooth feeding directly affects processing efficiency and operational safety. Both the feeding and discharging racks adopt V-shaped chain plates, enabling automatic wood centering, strong gripping force, effective prevention of wood rebound, and smooth board output. The guiding device keeps wood discharge from scattering while preventing the saw blade from overheating and scorching. The material pressing device firmly grips the wood to ensure stable sawing. The heavy-duty reducer provides high transmission efficiency and large output torque, further ensuring feeding reliability.

For safety, the feeding end is equipped with multiple anti-rebound devices, and the discharging end with one anti-rebound device, effectively preventing wood rebound from injuring people and enhancing safety during sawing. The electrical system features front and rear emergency stop switches for quick operation in emergencies. An external frequency conversion speed control panel makes feeding speed adjustment convenient, while the high-brightness laser positioning system maintains high clarity even under strong light, assisting precise sawing.

This series handles both wet and dry wood well. For wet cutting, water is recommended to lower blade temperature, extend service life, and reduce dust. For dry cutting, avoid prolonged continuous cutting to prevent reduced blade life and cutting quality. Reasonable cooling and operating rhythm are important for maintaining stable sawing quality.

The selection decision path can be summarized in four steps:

1. Define processing requirements: Determine the log diameter range, main wood species, daily output target, and proportion of long logs.

2. Match the model: Use the parameter table to make a preliminary selection by diameter; at boundary diameters, choose the next size up based on wood hardness and output requirements.

3. Verify core configuration: Confirm whether spindle power, blade diameter, bearing grade, and feeding method meet processing conditions.

4. Calculate operating costs: Incorporate blade wear, sharpening frequency, and wear-part replacement cycles into a comprehensive cost assessment rather than comparing purchase prices alone.

Operating and maintenance cost note: Selection involves more than purchase price—blade wear, sharpening frequency, and the lifespan of wear parts such as bearings are all important components of long-term operating costs. Take blades as an example: thin blades offer higher yield but less rigidity, suiting fast-growing wood; thick blades are more durable but lose more to kerf, suiting hardwoods and larger-diameter logs. Differences in the lifespan of bearings, chains, and sprockets also significantly affect total cost over a 2–3 year period. It is advisable to ask suppliers about wear-part replacement cycles and unit prices during selection to make a more comprehensive decision.