Woodworkers are discovering the benefits of retrofitting their old planers and jointers with spiral cutter heads, especially for the following reasons:
Firstly, a spiral cutter head provides a smoother finish with no tear-out. The angled position of each knife creates a shear cut, resulting in a staggered cut pattern that is superior to a single straight cut. This combined shear and staggered cut pattern eliminates tear-out and leaves a glossy finish on even highly figured hardwood.
Secondly, the noise level is significantly reduced as the spiral cutter head allows only a few knives to cut at a time in a staggered manner.
Thirdly, the inserts used in spiral cutter heads are made of sintered tungsten carbide, which is much harder than high-speed steel. With four edges on each insert, they last over ten times longer than high-speed steel.
Fourthly, the knives are easy to change and are interchangeable. With a precision ground tolerance of +/-0.0004" or +/-0.01mm, they can be rotated 90° for a new edge and tightened in just minutes.
Fifthly, the spiral cutter head produces thinner and shorter chips, making dust extraction much easier.
Finally, the cost to use a spiral cutter head is low. With a smooth finish that reduces or eliminates sanding work, and no need for sharpening, the product pays for itself in a very short time.
If you own a Grizzly G0855 8"x72" Jointer, a spiral cutter head is a worthwhile investment for achieving a superior finish on your woodworking projects.
Kit Includes:
* 40 carbide inserts installed.
* 5 extra carbide inserts
* 5 extra Torx screws
* 1 T-handle wrench
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.
