Simply put, CNC milling is a machining process that is ideal for the production of highly accurate and tolerant prototype parts. CNC parts must be in perfect condition for this process to work properly.
Tolerances can range from +/- 0.001 in. to +/- 0.005 in. depending on the type of machine used. Tolerance on some machines is typically greater than +/- 0.0005 in.
CNC Milling Operations That Are Common
CNC machining is widely applicable in a variety of fields and industries due to its versatility. CNC Milling commonly involves the following operations:
1. Milling of the Face
The cutting tool axis is perpendicular to the top of the workpiece in this type of milling process. Face milling cutters are used in this process.
Face milling cutters have teeth on both the periphery face and the tool face. The teeth on the periphery are primarily used for cutting, while the teeth on the face are primarily used for finishing.
To summarize, face milling's primary function is to create flat surfaces and figures on the finished surface. Most operators prefer this type of milling operation over others. This is due to the fact that it produces higher-quality finishes.
Side milling and end milling are the two main types of Face milling. Side milling cutters are used in side milling, while end milling cutters are used in end milling.
2. Straight Milling
It is also known as slab milling. The cutting tool's axis is parallel to the workpiece top in this type of milling operation.
The cutting procedure in this process is carried out with plain milling cutters. Cutters come in both narrow and wide varieties. Narrow cutters are used when making deep cuts. However, if the cut you want to make is not as deep, you can use the wide cutters.
As a result, it should be noted that the type of cutter used is influenced by the milling application's specifics. For example, the operator will know what size cutter to use based on the size of the workpiece and the depth of the cut.
Plain milling occasionally necessitates the removal of excess material from a piece of work. In such cases, the operator starts with a coarse-toothed cutter.
This process is set to run slowly, but the feed rates are extremely fast. The goal of implementing fast feed is to create a custom-designed part.
Following the completion of this process, a more precise and finely toothed cutter is introduced. To achieve the desired result, this process normally necessitates faster speeds and slower feed rates.
Angular Milling is a type of milling that is done at an angle.
Angle milling is another name for it. The cutting tool's axis is set at an angle parallel to the top of the workpiece in this type of milling operation.
Depending on the desired design, this process employs single-angle milling cutters. Serrations, chamfers, and grooves are examples of angular features that can be produced.
Dovetails are frequently made using angular milling. The type of dovetail cutter to use is determined by the design of the dovetail.
Form milling, Gang milling, Straddle milling, Gear cutting, and Profile milling are examples of milling operations.
The CNC machine does not always rely solely on the operations listed above. Other tools are used to improve the accuracy and efficiency of the machining process.