Dimensional deviations in small CNC lathe workpiece processing may be caused by many factors. Here are some possible reasons:

1. Machine tool accuracy:

The accuracy and stability of the machine tool itself are key factors affecting the processing dimensions. If the precision of the CNC lathe is not high enough, or there are problems such as wear and looseness, it will lead to deviations in the dimensions of the workpiece.

2. Tool wear:

Tool wear affects cutting quality and dimensional accuracy. Timely replacement of severely worn tools is an important step to ensure accurate processing dimensions.

3. Cutting speed and feed speed:

Unreasonable cutting speed and feed speed settings may lead to over-cutting and under-cutting, thus affecting the size of the workpiece. Proper selection of cutting parameters is crucial to maintaining dimensional stability.

4. Workpiece clamping:

The way the workpiece is clamped and the tightening force have an impact on the stability of the machining dimensions. Insecure clamping or improper clamping may cause the workpiece to shift position.

5. Ambient temperature changes:

Changes in ambient temperature will cause thermal expansion and contraction of the machine tool and workpiece, thus affecting the processing dimensions. When high-precision machining is required, attention should be paid to the impact of temperature changes on dimensions.

6.Material properties:

Different materials have different physical properties and cutting properties, and cutting parameters may need to be adjusted. For some special materials, different processing strategies may be required to maintain dimensional accuracy.

7. Programming errors:

Wrong CNC programs can lead to workpiece dimensional deviations. The geometry and tool paths in the program should be accurate to ensure that the required dimensions are machined.

8.Measurement error:

The accuracy of the measuring equipment is also a key factor. If the measuring equipment is inaccurate, the measurement results may be inaccurate, leading to misunderstandings of machined dimensions.

Solving the problem of processing dimensional deviation usually requires comprehensive consideration of the above factors and making appropriate adjustments and improvements. Regular equipment maintenance, timely replacement of worn tools, reasonable setting of cutting parameters and workpiece clamping, and accurate CNC programs are the keys to maintaining dimensional stability in small CNC lathe processing.