Straightness Description of Linear Motor Screw
The straightness of the screw refers to the degree of deviation caused by the screw during rotation. The higher the accuracy of straightness, the more stable and smooth the screw drive can be ensured. The accuracy of straightness is closely related to the length of the screw. The current standards commonly used in the industry are as follows:
The straightness of the screw rod with a length of ≤100mm is: within 0.08mm at the shaft end and within 0.03mm at the root;
The straightness of the screw rod with a length of ≤200mm is: within 0.1mm at the shaft end, 0.05mm in the middle of the shaft, and within 0.03mm at the root;
The straightness of a screw with a length ≤300mm is: within 0.15mm at the shaft end, 0.07mm in the middle of the shaft, and within 0.03mm at the root;
By analogy, for every 100mm increase in screw rod length, the straightness of the shaft end will increase by about 0.1mm.
It can be seen that the longer the screw, the lower the straightness accuracy of its shaft end, and the degree of deviation during motion will be higher. Therefore, when selecting a linear motor, if you use a screw that is too long, it is recommended to add support at the end. One is to prevent the screw rod from bending, and the other is to prevent the screw rod from deviating too high when rotating.
There is no difference in the straightness of trapezoidal screws and ball screws. Their straightness standards are the same. Please refer to the above instructions.
The straightness of the screw rod with a length of ≤100mm is: within 0.08mm at the shaft end and within 0.03mm at the root;
The straightness of the screw rod with a length of ≤200mm is: within 0.1mm at the shaft end, 0.05mm in the middle of the shaft, and within 0.03mm at the root;
The straightness of a screw with a length ≤300mm is: within 0.15mm at the shaft end, 0.07mm in the middle of the shaft, and within 0.03mm at the root;
By analogy, for every 100mm increase in screw rod length, the straightness of the shaft end will increase by about 0.1mm.
It can be seen that the longer the screw, the lower the straightness accuracy of its shaft end, and the degree of deviation during motion will be higher. Therefore, when selecting a linear motor, if you use a screw that is too long, it is recommended to add support at the end. One is to prevent the screw rod from bending, and the other is to prevent the screw rod from deviating too high when rotating.
There is no difference in the straightness of trapezoidal screws and ball screws. Their straightness standards are the same. Please refer to the above instructions.
Updated on: 29/03/2024
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