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#249 Mechanical Engineering and Automation Device Design - 15: Beam Structure and Bending

Category : Hints on designing
August12, 2016

The "beam" structure adds strength to construction and structural objects. The same concept will be utilized for cabinet design of mechanical devices. In this volume, we will learn about the types of beams and loads.

(1)Types of "beams"

Beams are generally available in the following five types:

a)Cantilever --- A beam structure anchored at only one end. The fixed side is called fixed end and the opposite is called free end.
b)Simply supported beam --- A beam structure where both ends of the beam are simply supported.
c)Overhanging beam --- A beam structure where loads are applied to the outside of the fulcrum.
d)Fixed beam --- A beam structure where both ends of the beam are fixedly supported.
e)Continuous beam --- A beam structure that is supported by three or more fulcrums.

fig

Description:

- Simple beams are adopted for SCARA (Selective Compliance Assembly Robot Arm) or the clamping arm mechanism (shown in Fig.a below) of a pick and place unit.

- Simply supported beams are adopted for the linear guide mechanism of shafts and ball bushing (see the below figure).

fig

(2)Types and expression of loads applied to the beam

- The case a) is a structure model that the mechanism is installed at the loaded area. The case b) is a model to adopt if you need to consider the effect of the weight of a beam itself.

fig

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