What is a Cutting Wheel?
Cutting wheels differ from grinding wheels in their function and structure. While the grinding wheel uses an abrasive to grind large pieces of material from the workpiece from a shallow angle, the cutting wheel usually makes a narrow, precise cut at an angle of 90 degrees. As a result, cutting wheels are often thinner than grinding wheels — although they do not have the lateral strength required for side grinding, their minimal thickness makes them better for clean and accurate cuts.
What are the types of cutting wheels?
Cutting wheels come in several different types. Some of the common types are type 1, type 27, type 41, and type 42, where different numbers denote different shapes and properties of the wheel.
Cutting Wheel Type 1 (Cutting Wheel Type 41)
The type 1 cutting wheel, also known as the type 41 cutting wheel, is completely flat. It is usually considered the most efficient type of cutting wheel for general purpose cutting. Because it has no depressed center, it provides more cutting surface and minimizes disturbance to the workpiece.
The flat profile helps make a deep 90 degree cut in the workpiece. This allows a maximum depth of cut of 90 degrees at the expense of little visibility for the operator. Although its straight profile and attachment to the guard may reduce operator visibility, the Type 1 cutting wheel is especially useful in grinders, die grinders, high speed saws, stationary saws and chop saws.
Cutting Wheel Type 27 (Cutting Wheel Type 42)
Instead of being completely flat, the Type 27 cutting wheel, also known as the Type 42 cutting wheel, has a depressed center. The compressed center allows additional clearance when the operator is working at restricted angles, although it gives the wheels limited cutting capability when working around corners, profiles or extrusions. The compressed shape allows the raised hub also to hold the wheels securely in place.
The depressed center profile of the cutting wheel gives the operator a better view of the cut, and it provides the ability to cut flat because the raised hub means the lock nut can be inserted in. The type 27 cutting wheel is designed for right angle grinders.
What Is The Material Of The Cutting Wheel?
Cutting wheels usually contain several different materials — primarily the grain that does the cutting, the bond that holds the grain in place, and the fiberglass that strengthens the wheel.
How to Choose a Cutting Wheel Size?
With a cutting wheel, the tool that is accessible to the operator will often determine the size of the wheel, and choosing the right size for a given application is also important. Selecting the correct size involves calculating the correct revolutions per minute (RPM) rate — the RPM rating of the cutting wheel must match or exceed the RPM rating of the grinder that will use it. In addition to verifying the RPM rating, it is also important to ensure that the wheel fits snugly on the tool without disturbing or removing the guard.
Cutting Wheel Is Usually Used For What Applications?
- General fabrication
- Pipe fabrication
- Shipbuilding
- Welding preparation
- Railroads
- Construction
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