Sheartak Spiral Cutterhead for LUNA L39 / 410 Planer Thicknesser
The Luna L39 / 410 is a heavy-duty, cast-iron combination surface planer and thicknesser, well known for its rigidity, large working capacity, and reliability in professional woodworking environments.
Upgrade your machine with the Sheartak Spiral Cutterhead, engineered to dramatically improve cut quality, reduce noise, and extend knife life.
Key Features & Benefits
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Full Set of Carbide Inserts on 5 Spirals
Equipped with a full set of precision-ground carbide inserts arranged in 5 spiral rows, delivering a smooth, staggered shear cut. More inserts allow each insert to remove less material, resulting in longer insert life and higher productivity compared to cutterheads with fewer knives.
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Superior Surface Finish
The inserts are angled to produce a true shear cut, delivering a glassy-smooth finish even on highly figured hardwoods and very soft woods. Tear-out is virtually eliminated compared to straight-knife cutterheads.
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Four Cutting Edges per Insert
Each 15×15×2.5 mm carbide insert features four usable cutting edges. Simply rotate the insert to expose a fresh edge—no sharpening or knife setting required.
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Exceptional Durability
Carbide inserts last up to 50× longer than traditional HSS blades, significantly reducing downtime and long-term operating costs.
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Quieter Operation & Improved Dust Extraction
The spiral cutting action greatly reduces cutting noise and produces smaller chips, making dust collection more efficient.
What’s Included
Warranty & Shipping
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One-year warranty against manufacturing defects (consumables excluded)
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Ships via Canada Post, USPS, and UPS
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Toll-Free Support: 1-877-41-SHEAR (1-877-417-4327)
Specifications
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Cutterhead Material: AISI 5140 high-tensile alloy steel
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Insert Material: Grade C3++ carbide
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Insert Size: 15 × 15 × 2.5 mm (R150)
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Number of Inserts: Full set (model-specific)
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Number of Rows: 5
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Wrench Size: Torx T25
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Screw Size: #10-32 TPI
Do I need to replace the original bearings?
If the bearings in your machine are in good condition, they can be reused by carefully removing them with a bearing or pulley puller. However, if the bearings are tightly pressed onto the shaft, removal may cause damage. To minimize this risk, we recommend replacing old bearings with our greased and sealed bearings, designed for long-lasting performance. For a smooth upgrade, we suggest adding the bearings to your shopping cart before completing your purchase.
We provide premium bearings from NSK, SKF, NTN, FAG, Timken. They are renowned for their high quality and performance, designed to provide durability and reliability in various applications
Do I need to to Add a Few Boxes of Carbide Inserts
We provide 5 carbide inserts and 5 screws as spare parts. However, many of our customers choose to purchase additional boxes, as the shipping costs for separate purchases can make it less economical.
Do I need a Torque Wrench?
To securely lock the carbide inserts, we recommend applying a torque of 48 to 52 Pound-Inches (or 5.42 to 5.88 Newton-Meters). (Note: 1 Newton-Meter is equal to 8.851 Pound-Inches, and 1 Pound-Inch is approximately 0.113 Newton-Meters.) It is crucial not to apply excessive torque, as this could cause the carbide inserts to crack or explode. On the other hand, using too little torque may result in the inserts not being properly secured, which could lead to cracks, shattering, or uneven height on the cutter block, causing ridges or lines on the board.
If one person is responsible for maintaining the machine, they can typically apply the same torque consistently without a torque wrench. However, when multiple people are involved in machine maintenance, ensuring uniform torque application can be challenging. For consistency and peace of mind, we recommend using a torque wrench.
What kind of steel the cutter block is made of?
The cutter block is constructed using GB/T 40Cr, a structural alloy steel of the same caliber as ASTM grade 5140, AISI 5140, SAE 5140, DIN 41Cr4, BS 41Cr4, JIS SCr440, and EN 41Cr4.The primary components of this steel are as follows: carbon (C) at a range of 0.37-0.44%, silicon (Si) between 0.17-0.37%, manganese (Mn) within 0.50-0.80%, and chromium (Cr) from 0.80-1.10%.
In terms of physical properties, this steel exhibits a tensile strength range of 115-234σb/MPa, a yield strength of 2σ 0.2 ≥/MPa, and an elongation capacity of 65 δ5≥ (%). It also has a HBS range of 123-321 and a HRC rating of 30.
This alloy steel is frequently utilized in low to moderately stressed components for machines, engines, and vehicles.
