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What are the differences between linear guides and linear shafts?
Linear shafts are commonly used mechanical components for guiding linear motion. Common types include crankshafts, straight shafts, and flexible shafts.
Publish Time:
2024-08-20
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Linear shafts are commonly used mechanical components that guide linear motion. Common types include crankshafts, straight shafts, and flexible shafts. They are used for infinite travel in conjunction with cylindrical shafts. Due to the point contact between the bearing balls and the shaft, the load used is small. The steel balls rotate with minimal frictional resistance, resulting in high-precision, smooth movement. Linear shafts are widely used in precision equipment such as electronic devices, tensile testing machines, and digital three-dimensional coordinate measuring equipment, as well as sliding components in industrial machinery such as multi-axis machine tools, punching machines, tool grinders, automatic gas cutting machines, printers, card sorters, and food packaging machines.
1. They have the same function as linear guides, both providing support and motion. The difference lies in the installation location and shape. Linear shafts are cylindrical, while linear guides are generally square, with areas machined for mounting sliding blocks. Linear shafts are typically fixed at both ends, with the connecting components suspended in the middle, encompassing all or most of the shaft's radial diameter. Linear guides usually have one side fully attached to the equipment's mounting base and secured with bolts.
2. Linear shafts are used with linear bearings and cylindrical shafts. Because the bearing balls make point contact with the bearing housing, the steel balls roll with very little frictional resistance. Therefore, linear shafts have low friction, are stable, and their performance doesn't change with bearing speed. This allows for smooth linear motion with high sensitivity and precision.
3. Linear guides have higher precision, greater load capacity, and stronger stability than linear shafts.
4. Linear shafts also have limitations. Primarily, linear bearings have poor impact load capacity and low load-carrying capacity. High-speed operation also results in significant vibration and noise, which are challenges facing the industry.
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