Question

When transferring torque using set-screws, why is it important to use "D" shaped shafts with small flats cut into them and what is this called?

A) To prevent slipping; it is called keying
B) To prevent slipping; it is called keyway
C) To allow for easy removal; it is called grub screw
D) To allow for easy removal; it is called shaft groove

Answer 1

Using "D" shaped shafts with flats, known as keying, is critical in mechanical applications to prevent slipping and ensure effective torque transfer from set-screws to shafts.

Step-by-step explanation:

When transferring torque using set-screws, it is important to use "D" shaped shafts with small flats cut into them to prevent slipping. This practice is called keying. The flat surface on the shaft provides a better surface for the set-screw to grip compared to a completely round shaft, thereby preventing the shaft from rotating independently of the set-screw. The interaction between the flat on the shaft and the set-screw ensures that the torque applied to the set-screw is effectively transferred to the shaft. This method is commonly used in mechanical applications where secure torque transmission is critical.