Sheartak Spiral Cutterhead for Beaver 6" Jointer Model 4800 with Premium Japan Bearings
Upgrade your Beaver 6" Jointer Model 4800 with a Sheartak Spiral Cutterhead for smoother cuts, quieter operation, and significantly longer tool life. This premium helical cutterhead is precision machined from high-strength alloy steel and comes fully assembled with 30 indexable tungsten carbide inserts and premium Japan bearings pre-installed for easy installation.
The spiral arrangement of the carbide inserts creates a true shear-cutting action that produces an exceptionally smooth surface, even on highly figured hardwoods, while greatly reducing tear-out and cutting noise.
Benefits of the Sheartak Spiral Cutterhead
Superior Surface Finish
The carbide inserts are mounted at a slight shear angle and arranged in a true spiral pattern. Only a few inserts engage the workpiece at any time, producing a staggered shear cut that leaves an exceptionally smooth finish with minimal or no tear-out, even on difficult grain.
Much Quieter Operation
Unlike conventional straight knives that strike the wood across its full width, the spiral cutterhead engages the material progressively. This significantly reduces cutting noise and vibration, creating a more comfortable working environment.
Long-Lasting Tungsten Carbide Inserts
Each cutterhead is equipped with 30 premium 15 × 15 × 2.5 mm solid tungsten carbide inserts. Carbide stays sharp many times longer than high-speed steel knives, reducing maintenance and downtime.
Each insert features four precision-ground cutting edges. If one edge becomes dull or chipped, simply rotate the insert 90° to expose a fresh cutting edge.
Quick and Easy Maintenance
The precision-ground inserts are manufactured to extremely tight tolerances (±0.01 mm / ±0.0004"), making every insert fully interchangeable.
There is no knife setting or height adjustment required. Simply loosen the screw, rotate or replace the insert, and tighten it again in just a few minutes.
Improved Dust Collection
The spiral cutting action produces smaller, thinner chips that are easier for dust collection systems to remove, helping keep your shop cleaner.
Lower Operating Cost
Because there is no knife sharpening or knife setting required, maintenance costs are greatly reduced. Combined with longer insert life, improved finish quality, and reduced sanding time, a Sheartak Spiral Cutterhead quickly pays for itself.
Standard Kit Includes
- Precision-machined high-strength alloy steel cutterhead
- 30 premium tungsten carbide inserts (pre-installed)
- Premium Japan bearings (pre-installed)
- 2 extra carbide inserts
- 2 replacement Torx screws
- Torx driver for insert replacement
Specifications
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Machine: Beaver 6" Jointer
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Model: 4800
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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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Insert Material: Premium micro-grain tungsten carbide
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Cutterhead Material: AISI 5140 high-tensile alloy steel
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Bearings: Premium Japan bearings, factory installed
Warranty
Every Sheartak Spiral Cutterhead is backed by a 1-Year Limited Warranty covering defects in materials and workmanship. Normal wear items, including carbide inserts and screws, are considered consumable parts and are not covered under the warranty.
Upgrade your Beaver 4800 jointer with Sheartak's precision-engineered spiral cutterhead and enjoy quieter operation, superior surface quality, and years of dependable performance.
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.
