Do you know how many of the 10 biggest taboos in mechanical design?
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01 Structural design of the transmission system 1. Avoiding motion uncertainty in hinge-four-bar mechanisms； 2. Pay attention to the dead point of the mechanism ； 3. Avoid lateral forces on the guide rails ； 4. The limit switch should be installed on the component with the greatest stroke in the linkage mechanism ； 5. Ensure that the transmission angle is not too small ； 6. The swing rod of a cylindrical cam with a swinging follower should not be too short ； 7. Properly arrange the guide rail position for the offset driven-piece disc cam to move the driven piece ； 8. Balance of planar linkage mechanisms ； 9. When designing intermittent motion mechanisms, the motion coefficient should be taken into consideration ； 10. Analyzing the reliability of locking devices using momentary interruption tests ； 11. When selecting the type of gear transmission, cylindrical gears should be considered first ； 12. When a reversal in mechanical operation is required, reversing the motor is generally an option to consider ； 13. The starting performance of the prime mover must be taken into account ； 14. Friction drive shall not be used in the lifting mechanism of cranes ； 15. For mechanisms that require slow movement, screws are superior to racks ； 16. Replace the loose transmission mechanism with a standard reduction gearbox featuring a large gear ratio ； 17. Replace the prime mover and transmission mechanism with a reduction motor ； 18. Use a shaft-mounted reducer ；
02 Design of Coupling and Clutch Structures 1. Proper selection of coupling type； 2. Coupling balance ； 3. Couplings with sliding friction should maintain good lubrication conditions ； 4. High-speed rotating couplings must not have any protruding parts ； 5. When using couplings that are aligned via shoulders and grooves, consideration must be given to the installation and removal of the shafts ； 6. When it is required that the drive components at both ends of the shaft rotate synchronously, flexible couplings with elastic elements should not be used ； 7. Precautions regarding nylon rope couplings ； 8. A single universal coupling cannot achieve synchronized rotation between two shafts ； 9. Do not use the outer cover of the gear coupling as a braking wheel ； 10. Pay attention to the lubrication of gear couplings ； 11. The clutch operating ring should be installed on the semi-clutch connected to the driven shaft ； 12. Precautions regarding shear pin safety clutches ； 13. Oil-lubricated friction disc clutches should not be used in situations requiring rapid separation ； 14. Multi-disc friction clutches are not suitable for use in high-temperature operating conditions ； 15. When the intermediate shaft has no bearing support, do not use cross-slider couplings at both ends ；
03 Shaft Structure Design 1. Minimize stress concentration at the sections where the shaft cross-section changes； 2. It is necessary to reduce the stress concentration at the interference fit of the shaft ； 3. Pay attention to the effect of stress concentration caused by keyways on the shaft ； 4. To reduce the difficulty of assembling and disassembling parts with interference fits ； 5. The starting point of assembly should not form a sharp angle, and the starting points of the two mating surfaces should not be assembled at the same time ； 6. The positioning of components on the shaft should be achieved using shaft shoulders or shaft rings ； 7. When installing a shaft with an interference fit in a blind hole, attention should be paid to removing air from it ； 8. Reasonably arrange the components on the shaft and improve the structure to reduce the stress on the shaft ； 9. Use load sharing to improve the strength and stiffness of the shaft ； 10. The journal surface must have sufficient hardness ； 11. Improve the surface quality of the shaft and enhance its fatigue strength ； 12. The positioning of multiple keyways on the shaft should be reasonable ； 13. The wall thickness at the lower part of the keyway in the hollow shaft should not be too thin ； 14. The keyway on the shaft should be easy to machine ；