Mechanical processing is what we often refer to as: machining. Processing accuracy refers to the degree to which the actual geometric parameters (size, shape, and position) of a part after processing match the ideal geometric parameters. The higher the degree of conformity, the smaller the error and the higher the machining accuracy. The machining accuracy should usually be controlled within a reasonable range. So how should the dimensional accuracy of mechanical processing be controlled.

The dimensional accuracy control method for mechanical processing: trial cutting method, which obtains the specified dimensional accuracy through the repeated process of trial cutting measurement adjustment trial cutting. This method is only applicable to single piece production. The methods for automatically obtaining dimensional accuracy include:

1. Use a fixed size tool for machining, and the dimensional accuracy is guaranteed by the tool's own dimensional accuracy. Such as using drill bits, reamers, zippers, milling cutters, planers, etc. for hole machining.

2. Adjustment method, first adjust the relative position of the tool and workpiece on the machine tool, and keep it unchanged during the processing of a batch of parts, suitable for batch and mass production.

3. Automatic control method, which automatically completes a series of tasks such as measurement, compensation, adjustment, and cutting during the machining process. Such as CNC machining or machining center machining.