Practical Techniques for Machining Small Turned Parts

In the field of precision turning, the machining of small parts demands extremely high precision in process details. Based on years of practical experience, FRIMA has summarized the following six core techniques to help you balance accuracy and efficiency in machining small-diameter parts.

1. Knife selection: Sharpness first, pressure controllable

• Using sharp, molded or ground cutting tools with PVD-coated inserts results in smoother cutting and longer tool life.
• Prioritize tools with a positive rake angle and a clearly defined cutting edge. Fully sintered tools lack sharpness and can easily cause part deformation.
• Small parts are extremely sensitive to tool pressure. Forming tools can simplify the process, and high-pressure coolant helps with chip removal.

2. Material selection: Balancing processability and performance

• Soft metals such as aluminum and brass have good machinability but limited strength; hard materials such as steel and titanium have high strength but are difficult to process.
• Material selection requires comprehensive consideration of the part's application scenario, machining process compatibility, and the suitability of coolants and lubricants.
• Inappropriate material selection may lead to part failure, increased costs, or even safety hazards.

3. Tolerance control: setting tolerances appropriately to balance accuracy and cost

• Tolerances that are too tight are difficult to achieve, while tolerances that are too loose will affect fit and function.
• Tolerances should be set according to the actual application scenario of the parts: tight tolerances should be used for precision-fitting parts, while tolerances should be appropriately relaxed for non-critical parts to reduce costs.

4. Surface finish: Designed according to functional and location differences

• Internal, non-visible parts can tolerate a rougher surface; externally visible parts require a higher surface finish to improve aesthetics and functionality.
• The choice of surface finish directly affects the friction, wear life, and overall appearance of the parts.

5. Threads and grooves: Optimizing connection strength and aesthetics

• Threading ensures reliable connection of parts, while groove design achieves a smooth surface transition.
• A proper combination of both can improve connection strength and load-bearing capacity, while also enhancing the product's appearance.

6. Wall thickness design: Finding a balance between strength and lightweight

• Excessively thin walls can lead to insufficient strength, while excessively thick walls increase weight and cost.
• Principle: While meeting strength and durability requirements, strive to keep the wall thickness as thin as possible to achieve a win-win situation of lightweighting and cost optimization.

FRIMA Warm Reminder

The above six points cover the entire process of small-sized turned parts, from design to machining. For further discussion of your part design, please feel free to contact us. The FRIMA engineering team will provide you with professional support.