angular momentum and angular velocity

Shaft couplings are used to couple or attach two shafts together, typically in an assembly where one shaft rotates and drives the other shaft -- for example, if a motor were to drive a pump, there would be a coupling between the two shafts.

Shaft couplings can be rigid (accommodating no misalignment) or flexible (accommodating some angular and/or radial misalignment of the two shafts). More information on various types of couplings is available here:

www.oepcouplings.com

Angular velocity is a vector with a direction and angular speed is a scalar with no direction.

angular momentum is the measure of angular motion in a body.

Angular alignment: the relationship between 2 lines, planes, etc. that create an angle between them (as in the angle formed in the letter A). The correct angulation dictates if they are in alignment or not (e.g. if you want a wide A, with an angle of 60 degrees but you print a narrow A of 30 degrees you would say it's not aligned).

Axial: there are 2 types - rotational and lateral. Rotational - e.g. - wheels of a car must be parallel. If they slant towards each other (facing either up or down) they are in rotational misalignment. Lateral - e.g. taking the same wheels, if front wheels are wider apart than normal, they are in lateral axial misalignment.

Hope this helps.