Sheartak Spiral Helical Cutterhead for Paulcall 6" Jointer with 30 Carbide Inserts
Upgrade your vintage Paulcall 6" Jointer with a premium Sheartak Spiral Helical Cutterhead. Proudly designed for this classic Australian-made machine, our cutterhead transforms the performance of your jointer by combining the strength of its heavy cast-iron construction with modern helical cutting technology.
The Sheartak cutterhead is equipped with 30 precision-ground tungsten carbide inserts arranged in a true spiral pattern to produce a shear-cut action. The result is a dramatically smoother finish, quieter operation, and significantly reduced maintenance compared to traditional straight knives.
Features & Benefits
Superior Surface Finish
Each carbide insert is mounted at a slight shear angle and arranged in a staggered spiral pattern. Instead of striking the wood all at once like conventional straight knives, the inserts gradually slice through the material, producing exceptionally smooth surfaces with virtually no tear-out—even on highly figured hardwoods.
Quieter Operation
Because only a few inserts engage the workpiece at any given time, cutting noise and vibration are greatly reduced, creating a more comfortable woodworking experience.
Long-Lasting Carbide Inserts
The cutterhead uses 30 indexable carbide inserts (15 × 15 × 2.5 mm) manufactured from premium sintered tungsten carbide. These inserts stay sharp more than ten times longer than conventional high-speed steel knives. Each insert features four precision-ground cutting edges, simply rotate the insert 90° to expose a fresh cutting edge.
Quick and Easy Knife Changes
All inserts are precision ground to ±0.0004" (±0.01 mm), making them fully interchangeable without the need for knife-setting jigs. Simply loosen the screw, rotate or replace the insert, and tighten it back into position in just minutes.
Improved Chip Extraction
The spiral cutting action produces smaller, thinner chips that flow more efficiently through your dust collection system, helping keep your workshop cleaner.
Lower Operating Costs
Unlike traditional straight knives, carbide inserts require no sharpening. Combined with reduced sanding time, longer tool life, and simple insert rotation, the Sheartak spiral cutterhead quickly pays for itself while delivering consistently superior results.
Specifications
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Fits: Paulcall 6" Jointer
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Number of Spirals: 5
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Number of Carbide Inserts: 30
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Insert Size: 15 × 15 × 2.5 mm
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Cutter Material: High-Tensile Alloy Steel
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Inserts: Premium Indexable Tungsten Carbide
- Replacement Inserts and Screws Available
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.
