Bit Varieties

• There are several different bit varieties available. Straight bits are used to cut straight down into a material, making a groove. Rabbeting router bits are used to create a rabbet, or notch in your wood. Chamfer bits make a bevel cut, or a cut which is not at a right angle. Flush trim router bits are used to make an edge straight on one bit of material flush with another. Molding router bits can create multiple edges at once and are usually available in a variety of architectural designs. Edge forming router bits form edges to your wood and come in a variety of different edge types. Joinery bits are specialized according to the joinery you wish to incorporate into your design.
  
  

Shank

• When choosing your router bit, it is just as important to choose the right shank. Shanks usually come in 1/4-inch and 1/2-inch diameters. 1/2-inch shanks are the best as they have a larger surface area, and this makes for a clean cut with less shaking. Most bits are available in both sizes, but some of the detailing router bits only come in the 1/4-inch size.
  
  

Bit speed

• Your router will have a speed adjustment on it, and setting the right speed for the bit you are using is important. Running your bit at the right speed is important for safety and optimum cutting efficiency. Your router speed will be measured in RPM, or revolutions per minute. When buying a bit, the manufacturer will put the maximum RPM for that particular bit on the packaging or the bit itself. You should never run a bit at a higher speed than specified.