Choosing and Using Router Bits
Most every woodworker has tried an inexpensive router bit because they were tempted by the low price. As the saying goes, you get what you pay for. It’s important to know that although router bits of different brands may appear the same, the important differences are impossible to see without precise measuring tools and magnification.
For example, the shank of an inexpensive bit is often undersized from sloppy machining; this can cause the bit to slip in the collet and spoil the workpiece. In contrast, Amana router bits are precisely ground no less than 0.002” under the collet dimension (see below photo). This ensures that the collet can firmly grip the shank of the bit.
Flipping through the pages of this catalog may be confusing at first because of the many bit choices. It’s helpful to first understand the type of bit that you need. Router bits are categorized by the type of cut that they make.
These are the bits that allow you to create beautiful custom moldings for furniture, cabinets, and trim work for your home. Decorative ogees, coves, beads and chamfers are but a few of the many profile bits you’ll find in these pages. Many profiles are available in a number of sizes. Mixing and matching the sizes and profiles allows you to create most any molding you can imagine for that special woodworking project.
When choosing a profile bit, remember that the wood profile is opposite of the bit profile. Amana makes it easy to select the correct profile bit by providing an illustration of the wood adjacent to each bit profile. And, to make it even easier, the illustrations are full-scale and are available to be printed out online at www.amanatool.com (limited items currently).
Flush Trim and pattern bits
These router bits increase production perhaps more than any other type of bit. At first glance, flush trim bits look like a straight bit. However, a flush trim bit has a guide bearing on the end. Pattern bits have a bearing on the shank. Both designs follow a template or pattern to create a perfect duplicate (PHOTO 4). So whether you’re making two or two hundred of the same item you’ll want one of these versatile bits.
For a super-smooth finish in difficult grain, try a spiral flush trim bit.
For the greatest economy, take a look at Amana In-Tech bits here. These bits use solid carbide inserts that hold an edge up to four times longer than brazed bits (PHOTO 5). There is no need to sharpen these bits, just replace the inserts and you’re back in production. Because there is no sharpening of these unique bits, the profile is consistent when the inserts are replaced.
Amana In-Tech bits are available in a variety of decorative profiles as well as bits for flush-trimming and rabbeting.
Cutting Diameter (‘D’) refers to the largest cutting diameter of the tool and is represented in fractions, decimals and/or millimeters.
Cutting Length (‘B’ or ‘C’) refers to the length or ‘depth’ of the cutting edge. This dimension usually represents the cutting edge/length parallel to the length of the shank. Represented in fractions and/or millimeters.
Shank Diameter (‘d’) refers to the largest diameter of the shank and is equivalent to the router collect inside diameter that is necessary to use the tool. This dimension is represented in fractions.
Overall Length (‘L’) refers to the total length of a router bit from the top of the shank to the bottom of the tool at its furthestmost point. This dimension is represented in fractions and/or millimeters.
Radius (‘R’) of a cutting tool edge refers to one-half the diameter of a complete circle, and is shown in fractions and/or millimeters.
Beveled Angle (‘aº’) refers to the angle formed between the cutting tool edge and a straight line drawn parallel or perpendicular to the shank length, and is measured in degrees.
Rake Angle (’T’) refers to the angle (or ‘hook’) of the cutting tool tip in relationship to a straight line drawn perpendicular through the center of the tool. This dimension is measured in degrees.
Primary Radial Clearance (‘P’) refers to the relief grind on the tip of the tool and is measured in degrees.
Second Radial Clearance (‘O’) refers to the combined relief grind of the primary clearance and the clearance ground into the body of the tool. This dimension is measured in degrees.
Penetration Clearance (’S’) refers to the angle formed between the cutting tools edge and a straight line drawn perpendicular to the shank of the tool, and is measured in degrees. This angle allows gradual penetration into the material.
Web Diameter (’N’) refers to the thickness of the ground steel body of the tool, including the heel area (’M’). The web must be of adequate thickness to withstand industrial routing applications.