Upgrade Startrite SD31 12"x8" Planer Thicknesser with a Sheartak Spiral cutter head, 56 Carbide Knives, for superior performance, efficiency, and finish quality.
Why Choose a Spiral Cutter Head?
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Smoother Finish with No Tear-Out – Each carbide insert is set at a slight angle, creating a shear cut that reduces tear-out and produces a glossy, high-quality surface—even on highly figured hardwoods.
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Quieter Operation – The staggered cutting action significantly reduces noise levels compared to traditional straight blades.
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Extended Blade Life – The 15x15x2.5mm carbide inserts are made of sintered tungsten carbide, lasting 10 times longer than high-speed steel. Each insert has four cutting edges for extended use.
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Quick & Easy Blade Replacement – Precision-ground to ±0.0004" (±0.01mm) for perfect alignment, the inserts are fully interchangeable. Simply loosen the screw, rotate 90° for a fresh edge, and tighten. This reduces production time by 30%.
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Improved Dust Extraction – The spiral design produces thinner, shorter chips, making dust collection more efficient and preventing clogging.
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Cost-Effective & Low Maintenance – With no sharpening required and a dramatically smoother finish that reduces or eliminates sanding, a spiral cutter head quickly pays for itself.
Spiral Cutter Head Kit Includes:
✅ High-tensile strength alloy steel cutter block
✅ 56 carbide inserts pre-installed
✅ 5 extra carbide inserts & 5 extra screws as spare parts
✅ 1 wrench for easy maintenance
Upgrade your planer today and experience smoother cuts, quieter operation, and long-term savings with a spiral cutter head!
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
If you add the bearings to your order, we will preinstall them for you when premounting is possible, saving you the hassle of doing it yourself.
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.
