Turning vs milling: a comprehensive comparison of the six core dimensions

The difference in main motion extends to the comprehensive differentiation of the two in dimensions such as machining objects, cutting characteristics, accuracy performance, and tool systems.

1. Processing objects: rotational symmetry vs complex irregular shapes

This is the most intuitive scene boundary.

Turning machining: exclusive rotational symmetrical parts, typically including:

Shaft types: motor shaft, pin shaft, piston rod, screw;

Disc sleeves: flanges, gear blanks, bearing seats, nuts, sleeves;

Surface Rotation Class: Ball Head, Cone Surface, Arc Profile, Rotary Surface;

Thread types: internal and external cylindrical threads, tapered threads, trapezoidal threads.

Turning is the most efficient machining method for any feature that is rotationally symmetric around the central axis.

Milling machining: covering non rotating multi-dimensional structures, typically including:

Flat type: mold base plate, installation surface, reference plane;

Groove type cavities: keyway, T-groove, cavity, sinking platform, groove;

Irregular profiles: irregular shapes, camshafts, gear teeth, complex surfaces;

Polyhedral class: Blocks, polyhedra, and parts with multi angle holes.

For complex structures without rotational symmetry, milling is almost the only forming solution.

2. Cutting characteristics: continuous and stable vs intermittent impact

The force state during the cutting process directly affects the surface quality and tool life.

Turning process: continuous cutting process, the cutting edge is always in contact with the workpiece, the cutting force is relatively stable, and there is no frequent impact;

The advantages are smooth cutting process, low vibration, easy to obtain uniform surface quality, uniform tool stress, and longer service life;

Suitable for large margin rough and high gloss finishing, especially for mirror high gloss processing of non-ferrous metals such as aluminum and copper.

Milling process: intermittent cutting process, multiple cutting teeth alternately cut in and out, and cutting force fluctuates periodically;

The characteristic is the presence of impact loads, which can easily cause vibration of machine tools and cutting tools, and require higher system rigidity;

It is divided into two modes: forward milling and reverse milling. Forward milling has better surface quality and longer tool life, while reverse milling is suitable for rough machining and workpieces with hard skin.

3. Surface quality and accuracy: Each has their own expertise in precision fields

There is no absolute level of precision between the two processes, but rather different dimensions of precision in which they excel.

Turning machining:

Proficient in ensuring roundness, cylindricity, coaxiality, runout and other rotational positional tolerances, with easy precision control;

The characteristic of continuous cutting makes the surface cutting pattern uniform and fine, and the precision turning and high gloss knife can easily achieve a mirror effect below Ra0.8;

Stable dimensional accuracy and strong consistency in batch processing make it the preferred process for precision shafts and seals.

Milling processing:

Proficient in ensuring flatness, positional accuracy, contour accuracy, and other positional tolerances, it is the precision guarantee for both flat and irregular contours;

Multi tooth intermittent cutting is prone to leaving fine cutting patterns, which can usually reach Ra1.6~3.2 after precision milling. Higher smoothness requires subsequent polishing and grinding;

Multi axis linkage can achieve the forming accuracy of complex surfaces and is the core processing method for irregular parts such as molds and blades.

4. Tool System: Simple Single Blade vs Complex Multi Blade

The significant difference in tool shape and cost directly affects machining costs and tool changing efficiency.

Turning processing: mainly using single blade cutting tools, consisting of a tool holder and an rotatable blade, with a simple structure;

The blade has a high degree of standardization, is easy to replace, has a lower unit price than milling cutters, and the cost of cutting tools is controllable;

Divided by function, it includes external circular knives, internal hole knives, groove knives, thread knives, forming knives, etc., with strong targeting and fast tool changing speed.

Milling processing: mainly using multi blade rotating cutting tools, including end mills, face mills, ball cutters, keyway cutters, forming milling cutters, etc;

There are various types of cutting tools with a wide price range, and the cost of solid carbide milling cutters is significantly higher than that of cutting blades;

The correlation between tool life and cutting parameters is high, and a reasonable cutting strategy can effectively extend the tool life.

5. Production efficiency: Leading in turning rotary parts and winning in milling irregular parts

Efficiency comparison must be combined with the type of parts and cannot be generalized.

Rotating parts: Turning efficiency is much higher than milling. One clamping can continuously complete multiple processes including outer circle, inner hole, end face, groove cutting, and thread cutting. The cutting process is continuous without any gaps, and the machining cycle is 3-5 times faster than milling;

Complex shaped parts: Milling is irreplaceable. Multi axis linkage can complete multi-faceted and multi feature machining in one clamping, which cannot be achieved by turning;

Batch adaptability: Turning is more suitable for mass production of large quantities of rotating bodies, with fast changeover and stable cycle time; Milling is more suitable for multi variety and small batch irregular parts, with stronger flexibility.

6. Clamping method: Chuck ejector pin vs fixture fixture

The clamping logic is completely different, which directly affects the auxiliary working hours and positioning accuracy.

Turning machining: Standard configuration includes three jaw chuck and four jaw chuck, with long axis type matched with tailstock ejector pin, easy clamping and positioning, and convenient alignment;

One clamping can complete multiple rotation processes, with short auxiliary working hours.

Milling processing: commonly used pliers, pressure plates, specialized fixtures, and complex parts require customized imitation fixtures;

Multi sided processing requires multiple flipping and changing of the surface, with a higher proportion of auxiliary labor hours. When combined with four or five axes, it can reduce the number of clamping times.