How is shaft keyway calculated?

The key and key seat cross section are ISO standardized. The key length should be less than about 1.5 times the shaft diameter to ensure a good load distribution over the entire key length when the shaft becomes twisted when loaded in torsion.

What are shaft keyways?

Shaft keyway and keys are used to transmit torque from shafts to mechanical transmission elements such as gears, pulleys, etc. using a keyed joint. They can be made using either a standard stock material such as key stock or custom machined to suit the application. Advertisement.

How long is a standard key?

Length: 1/2 in. Size: 3/32 in. x 1/2 in.

What is P9 tolerance?

The second is a P9 tolerance. This is an undersized clearance. The advantage of the Js9 tolerance is that the key can be inserted and the gear manipulated without much difficulty, whereas the P9 tolerance is a press fit tolerance.

What material is key steel?

drawn carbon steel
Key Steel is a bright drawn carbon steel available in standard metric and imperial sizes (listed at bottom of this page). Key Steel is widely used for many general engineering applications. Typical key steel applications include taper, gibhead, plain and parallel keys.

What is the primary purpose of the clearance or gap between the key and the keyway?

To ensure that the hub seats properly on its shaft, provide some clearance between the key and the bottom of the hub keyway. In the case of a coupling hub, this clearance provides an opening through which water or corrosive gases can enter the coupling, causing damage to its internal surfaces.

Which of the following key does not require keyway on the shaft?

Hollow and flat keys They are only used for transmitting little rotary forces. For these no keyway must be made: – The bottom of hollow keys is concave in longitudinal direction. The edges of these keys resemble cutting edges which contact the shaft.

How to dimension a keyway?

standard keyseat dimensions a b +0.000 -0.015: c +0.002 -0.000: d nominal shaft diameter bottom of shaft to bottom of keyway width reference depth

How to calculate the square key length for shafts?

– Uniform: electric motor, steam or gas turbine (small, rarely occurring starting torques) – Light Shock: electric motor, steam or gas turbine (large, frequently occurring starting torques) – Moderate Shock: multiple cylinder internal combustion engines – Heavy Shock: single cylinder internal combustion engines

What are shaft keyways, its characteristics and benefits?

Sunk Keys. A sunk key is a key that fits into keyways in both the shaft and the secured member in machinery.

What is a keyway on a shaft?

Keyways. A keyway is a recess in a shaft or hub to receive a key, and these recesses are commonly cut on key-seating machines or by broaching, milling, planning, shaping and slotting. From: Manual of Engineering Drawing (Fifth Edition), 2020. Download as PDF.