Carpentry Tools Sharpening Service

Circular Saw Blade Sharpening Services

Circular Saw Blade Sharpening Services Near Mobile Alabama

One of the sharpening services finished in the shop today was a freud 11562618 – 50/11, a 12″ inch, 100 tooth rip-cut blade. Freud makes superb blades and when I receive these in the shop I recognize the investment the owner has in the blade and enjoy bringing the blade back to like-new or better-than-new condition.

Circular Saw Blade Anatomy

This blade has a 10 degree hook angle bevel with an ATB grind and from-the-factory side grind polish. Sharpening this type of blade takes quite a bit more time than most of the common home-owner or building contractor type of blades. More time is required because the diamond wheels I use for sharpening must be alternated for every other tooth. And, the side of each tooth should be polished – usually with 4,000 grit diamond stones.

Circular-Saw-Blade-Anatomy-Diagram
Circular-Saw-Blade-Anatomy-Diagram

This diagram may help clarify some of the terms I use. Tooth design is the determining factor in deciding which blade is best for any application. Here’s a quick overview of how subtle changes in bevel, gullet and kerf affect cutting performance.

Bevel – Teeth can have a single bevel, two bevels or no bevel at all. Types of bevels can alternate from tooth to tooth on a given blade. The bevel is what gives a blade its specific cutting pattern.

Gullet – This is the space between teeth that clears the work piece of chips after the cut. The deeper the gullet, the more efficiently chips are cleared.

Kerf – This is the face of the tooth, where the actual cutting takes place. The pattern of alternating kerfs, known as the grind, decides what applications a blade is best for.

Circular Saw Blade Grind Types

Circular Saw Blade Anatomy – Tooth Grinds

Flat Top Grind (FTG) – best for ripping

Circular-Saw-Blade-Anatomy-Flat-Top-Grind

Alternate Top Bevel (ATB) – for cross-cutting, cut-off and trimming

Circular-Saw-Blade-Anatomy-Alternate-Top-Bevel

Triple Chip Grind (TCG) – perfect for hard, abrasive materials like non-ferrous metals, hardwoods and plastics

Circular-Saw-Blade-Anatomy-Triple-Chip-Grind

Multi-Purpose Carbide Tipped (MCT) – for ripping and crosscutting, miter

Circular-Saw-Blade-Anatomy-Multi-Purpose-Carbide-Tipped

Tri-Grind (TRI) – combination grind

Circular-Saw-Blade-Anatomy-Tri-Grind

Left Trim Grind (3/1) – good finish, one side only

Circular-Saw-Blade-Anatomy-Left-Trim-Grind

Right Trim Grind (3/1) – good finish, one side only

Circular-Saw-Blade-Anatomy-Right-Trim-Grind

Solid Surface Grind (SSG) – for extremely dense man-made materials

Circular-Saw-Blade-Anatomy-Solid-Surface-Grind

High 30 degree ATB (MH) – chip-free cuts on melamine and plywood

Circular-Saw-Blade-Anatomy-High-30-RTB


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Published: January 2, 2019

Router Bit Sharpening

Freud 99-569 3-1:2-Inch Raised Panel Bit with Back cutters

With today’s geometry and materials used in router I highly recommend to sharpen them only with precision equipment. Since sharpening router bits changes the profile in subtle ways, be aware that if the bit is used for jointing, it is better to buy new ones. For example, if a specific dimension is to be routed, i.e., 3/4″ wide dado, a re-sharpened bit could give less than that, making additional milling necessary to get a good fit into that dado. However, if the bit is strictly a decorative style, resharpening the bit is the way to go.

Freud 99-569
3-1/2″ (Dia.) Raised Panel Bit w/Backcutters with 1/2″ Shank

One of the items to be sharpened today is this freud 99-569 raised panel router bit. I have found that Freud’s carbide micrograin technology accepts a good edge with diamond honing at 600 grit.

If you are interested in making raised panel doors, freud offers “A Shop Guide to Making RAISED PANEL DOORS on the Router Table.”

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Published: January 1, 2019