Methods for Achieving Dimensional Accuracy in Machining
1) Trial Cutting Method: During machining, a small section of the part is first cut as a trial, then measured. Based on the difference between the measured result and the required dimension, the relative position of the cutting tool to the workpiece is adjusted using the feed mechanism or other methods. This process of trial cutting, measurement, and adjustment is repeated until the specified dimension is achieved, after which the entire surface to be machined is cut. The test-cutting method is inefficient and requires a high level of technical skill from the operator; it is primarily used for single-piece or small-batch production, or for machining high-precision parts.
2) Adjustment Method: The position of the cutting tool relative to the workpiece’s machined surface is adjusted based on a test-cut workpiece, a standard sample, or a tool-setting device, and this position is maintained throughout the machining process to achieve the required dimensional accuracy of the part. The adjustment method is primarily used for batch and mass production.
3) Dimensional Tool Method: The dimensional accuracy of the part is ensured by a tool or combination of tools of a specific size; this method is commonly used for machining holes, grooved surfaces, and formed surfaces.
4) Automatic Control Method: Through a tool position control system comprising a dimensional measurement device, feed mechanism, and control mechanism, a series of operations—including dimensional measurement, tool compensation and adjustment, and cutting—are automatically performed during the machining process, gradually achieving the required dimensional accuracy. The automatic control method is, in essence, an automated version of the trial cutting method.
CNC Metal Part Milling Services
Difference Between Turning and MillingCore Differences
The main difference between milling and turning is that milling uses a rotating cutting tool on a fixed workpiece, while turning spins the workpiece against a stationary cutting tool.
Core Differences
Motion: In CNC milling, the part stays still and the cutter spins. In CNC turning, the part spins and the cutter stays still.
Tooling: Milling uses multi-point cutters like end mills. Turning uses single-point cutting tools.
Shape: Milling builds flat faces, slots, pockets, and 3D shapes. Turning builds round, cylindrical, or conical parts like shafts and bushings.
