Arbor

Within the context of this paper it will be defined as a blade mounting and locating system that is supported on both ends by the machine system that is driving it.

Hub

Within the context of this paper it will be defined as a blade mounting and locating system that is supported on one end by the machine system that is driving it.

Hub Module

This is both a Hub and an Arbor used in combination. The Arbor is used to support and locate the Hub assembly onto the drive system.

Spacers

These are used to not only retain and support the blades, but also to establish the pitch and/or land of a gang arbor or hub module assembly.

Spacers should be stable, stiff and lightweight for most precision applications. Some materials used for spacers and the benefits of each are:

Sintered Alumina - stable, stiff and lightweight (but brittle).

Sintered Tungsten Carbide - stable, stiff and tough (but heavy)

Anodized aluminum – very lightweight (but not as stable or as stiff)

Gang

Is a set of Blades and Spacers, assembled on an Arbor or a Hub.

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