Difference between linear guide and linear axis

Time:2025-11-24   

Hiwin HG Series Linear Rails

A linear axis is a commonly used mechanical component that guides linear motion. Common types of axes include crankshafts, straight shafts, and flexible shafts. It is used for infinite travel in conjunction with cylindrical shafts. Due to the point contact between the bearing ball and the shaft, a small load is applied. The steel ball rotates with minimal frictional resistance, allowing for high-precision and smooth motion. Linear axes are widely used in precision equipment such as electronic devices, tensile testing machines, and digital 3D coordinate measuring devices, as well as sliding parts of industrial machinery such as multi axis machine tools, punch presses, tool grinders, active gas cutting machines, printers, card sorting machines, and food packaging machines.

1. It has the same function as linear guides, serving as support and movement. The difference between the two lies in the device location, and the shape is also different. The optical axis is circular, while the linear guide is generally square with a fixed device slider machined on it. The linear optical axis is generally fixed at both ends, and the central suspended connecting component covers all or most of the radial direction of the optical axis. Linear guide rails are generally fixed with bolts, with one side tightly attached to the equipment base.

2. Linear axis is used for the cooperative application of linear bearings and cylindrical shafts. Due to the contact between the bearing ball and the outer sleeve of the bearing, the steel ball rolls with very little frictional resistance. Therefore, the linear optical axis has low friction and is relatively stable, not changing with the bearing speed, and can achieve stable linear motion with high sensitivity and accuracy.

3. Linear guides have higher accuracy, greater load capacity, and stronger stability than linear bearings.

4. The consumption of linear bearings also has its limitations, primarily due to the poor impact load capacity and load-bearing capacity of linear bearings; Another challenge faced by professionals is that linear axes experience significant vibration and noise during high-speed motion.

HG Series,Linear Rails