Crosswedge

During the crosswedge rolling process, the empirical correlation of the coefficient of friction is expressed as μf=0.5 X exp(−δωr) [2.31] where the linear velocity is in.

Source: wiktionary

These are all the shoulders that will be necessary, unless when the reversing motion is used, and in that case, two more square or polygonal parts w w, must be formed for the external ratchet-wheels N and O to be fixed upon, and these wheels may be secured in their places by the washers x x, which may be screwed on, or, what is better, be made secure by crosswedge-keys driven through them, as shewn in the figure.

Source: wiktionary

He had trimmed the ends of the axle log into rough rounds, and once the wheels were in place split the ends and placed crosswedges in them.

Source: wiktionary

The drawback to this design was the need for a crosswedge in the slide near the muzzle, for assembly and disassembly.

Source: wiktionary