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11 Aug. 20

CIRCULAR SAW BLADES

In this post we’re going to have a look at saw blades in a little bit more detail. This information will help you know what to look for when buying your next blade.

What makes a circular saw blade? The main parts are the Body, which is the piece of steel that is the blade itself, and the Teeth which are the small tips which cut through the material.

In order for the teeth to cut they need to be sharp, and in order for them to cut effectively and safely they need to be angled. This blog post is going to look into both of these aspects and help you know what to look for when you’re buying a new circular saw blade.

 

GRINDING

Almost all circular saw blades nowadays are classed as TCT Blades, with TCT standing for Tungsten Carbide Tipped. This means that brazed onto each steel tooth is a small tip made of carbide, and this is what performs the actual cutting.

In order for the carbide tip to cut it needs to be sharpened, and this is done by the process of grinding. The tips are ground differently for different materials, with the most common types of grind being:

ATB (Alternate Tooth Bevel) – This is used for cutting wood and features a bevel across the top of the tooth which is angled from the outside in. Each tooth’s bevel alternates between the left and right side. ATB grind is most popular for wood as it allows the user to Rip (cut along the grain) as well as Cross Cut (cut across the grain).

Triple Chip Grind – This grind is used for cutting soft metals such as aluminium, as well as plastics and laminate. It features two different grinds in alternating teeth, one tooth is ground flat, and the next tooth is ground as a trapeze. The Trapeze tooth cuts a groove into the material, and the flat tooth then comes and removes the sides left by the groove.

Special Bevel Sharpening – Specifically designed for cutting into hard metals such as steel this grind offers a mix of a Flat Top and an Alternate Beveled edge. This is not as aggressive as ATB grind so, coupled with a negative hook angle (which is explained further down), it allows you to cut into steel slowly without knocking the carbide tip off the blade.