68. Calculation of connection strength for GB1099 semi-circular keys

If you know the shaft diameter "d", you can consult the machinery manual to obtain all the dimensions of the half-moon key, including the nominal length.

Benefits and drawbacks of flat keys and 68.GB1099 semi-circular key connections ---- Simple, compact, and reliable with easy assembly and disassembly, low cost ---- Key slots weaken shaft strength, cause stress concentration, and make centering difficult

The drawback is that it weakens the shaft's strength, typically used only in areas experiencing less stress.

The round key transmits torque through the side. The key can swing around the center of curvature at the bottom of the shaft groove, making assembly easy. The keyway is deeper, significantly reducing the shaft strength.

68. The GB1099 semi-circular key is a type of key with a flat top surface and a semi-circular arc bottom surface, parallel side surfaces, commonly known as a crescent key. It is connected in a similar manner to flat keys but is easier to manufacture and assemble, particularly suitable for connecting conical shafts with hubs. Its drawback is that it weakens the shaft's strength, generally used only in areas with less load.