With the continuous development of social science and technology, at present, more and more people to the product is adhering to the excelsior attitude, along with the emerging is a series of precision instruments, precision instruments also cannot leave the little parts - high precision small screw, also some micro precision instruments screws to 0.1 mm.The screw is small, but plays an important role.  So what are the production processes of small screws for precision instruments?  Hope can give me chance to introduce two kinds of thread processing methods for you: Thread processing methods mainly include thread cutting and thread rolling

Thread cutting: generally refers to the method of thread processing on the workpiece with forming tools or grinding tools, mainly including turning, milling, tapping, sleeve wire, grinding and cyclone cutting.  When turning, milling and grinding threads, the rotating chain tool, milling cutter or sand wheel of the machine tool moves one lead along the axial direction of the workpiece accurately and evenly at each turn of the workpiece.  When tapping or sleeve wire, the tool rotates and moves relative to the workpiece, and the thread grooves formed first guide the tool to move axially.

Thread rolling: using the forming rolling die to make the workpiece produce plastic deformation to obtain the thread processing method, is also the industry often said cold heading, The machiens of this production method are generally used in single mold machine, multi-station machine, die machine, etc., and using this way to produce screws, it can be faster and lower cost.But relative to the cutting process, the screw head and tail produced by this process are naturally formed, the appearance is rounded, not as sharp and angular as the cutting process, the appearance is beautiful.
Each method has the characteristics, while cutting process is slower than cold heading, but the precision is higher than the cold heading process, while the cold heading process has the advantage in quantity and speed of production.So if the MOQ is low, you can choose CNC, if not, the cold heading is better for you. 
Our company can according to your requirements to choose suitable processes for your precision small screws.if you need them, welcome to send the inquiry!