In the field of mechanical processing, the selection of the tool system directly affects the processing accuracy, surface quality and production efficiency. Among various types of tool holders, SK tool holders, with their unique design and reliable performance, have become the first choice for many mechanical processing professionals. Whether it is high-speed milling, precision drilling or heavy cutting, SK tool holders can provide excellent stability and precision guarantee. This article will comprehensively introduce the working principle, prominent advantages, applicable scenarios and maintenance methods of SK tool holders, helping you better understand this key tool.
Meiwha BT-SK Tool Holder
I. Working Principle of SK Handle
Meiwha BT-SK Tool Holder
SK tool holder, also known as a steep conical handle, is a universal tool handle with a 7:24 taper. This design enables it to be widely used in CNC milling machines, machining centers and other equipment.
The SK Tool Holder achieves positioning and clamping by precisely mating with the taper hole of the machine tool spindle. The specific working principle is as follows:
Conical surface positioning: The conical surface of the tool handle comes into contact with the internal conical hole of the spindle, achieving precise radial positioning.
Pin pull-in: At the top of the tool handle, there is a pin. The clamping mechanism inside the machine tool spindle will grip the pin and exert a pulling force in the direction of the spindle, firmly pulling the tool handle into the spindle's taper hole.
Friction clamping: After the tool handle is pulled into the spindle, the torque and axial force are transmitted and borne by the huge frictional force generated between the outer conical surface of the tool handle and the inner conical hole of the spindle, thereby achieving clamping.
This 7:24 taper design gives it a non-locking feature, which means that the tool change is very quick and enables the processing center to perform automatic tool changes.
II. The Outstanding Advantages of SK Tool Holder
SK Tool Holder is highly favored in mechanical processing due to its numerous significant advantages:
High precision and high rigidity: SK Tool Holder can offer extremely high repeatability positioning accuracy (for example, the rotational and repetitive accuracy of certain hydraulic SK Tool Holders can be < 0.003 mm) and rigid connections, ensuring stable and reliable processing dimensions.
Extensive versatility and compatibility: SK Tool Holder complies with multiple international standards (such as DIN69871, Japanese BT standards, etc.), which gives it excellent versatility. For instance, the JT type tool holder can also be installed on machines with American standard ANSI/ANME (CAT) spindle taper holes.
Quick tool change: At 7:24, the non-self-locking feature of the taper enables the rapid removal and insertion of tools, significantly reducing auxiliary time and enhancing production efficiency.
High torque transmission capability: Due to the large contact area of the conical surface, the generated friction force is significant, enabling the transmission of powerful torque. It meets the requirements of heavy cutting operations.
III. Maintenance and Care of SK Tool Holder
Proper maintenance and care are crucial for ensuring that SK Tool Holders maintain high precision and extend their service life over an extended period:
1. Cleaning: Before installing the tool holder each time, thoroughly clean the conical surface of the tool holder and the conical hole of the machine tool spindle. Ensure that there are no dust, chips, or oil residues remaining. Even tiny particles can affect the positioning accuracy and even damage the spindle and the tool holder.
2. Regular inspection: Regularly check whether the conical surface of the SK Tool Holder is worn, scratched or rusted. Also, check if the lathe has any wear or cracks. If any problems are found, they should be replaced immediately.
3. Lubrication: According to the requirements of the machine tool manufacturer, regularly lubricate the main shaft mechanism. Be careful to avoid contaminating the tool holder and the conical surface of the main shaft with the grease.
4. Use with Caution: Do not use tools such as hammers to strike the handle of the knife. When installing or removing the knife, use a dedicated torque wrench to lock the nut according to the specifications, avoiding either over-tightening or under-tightening.
IV. Summary
As a classic and reliable tool interface, SK Tool Holder has established a significant position in the field of mechanical processing due to its 7:24 taper design, high precision, high rigidity, excellent dynamic balance performance, and wide versatility. Whether it is for high-speed precision machining or heavy cutting, it can provide solid support for technicians. Mastering its working principle, advantages, application scenarios, and implementing correct maintenance and care not only enables the full performance of SK Tool Holder but also effectively improves processing quality, efficiency, and tool life, safeguarding the production efficiency of the enterprise.
Post time: Aug-29-2025
