When the Keyway is completely filled by the key as in the figure it is termed a solid key and Keyway, indicating that there is no draft to the Keyway.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
The amount of this draft is made equal to the taper of the key, hence, when the key is driven in so that its head comes level with the socket or work surface, the draft will be all taken up and the key will fill the Keyway.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose
If a Keyway is to be cut in a shaft the cape chisel should be used in the same manner as above.
"Modern Machine-Shop Practice, Volumes I and II"
Joshua Rose