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The force is sent down the sides and into the ground, or bottom edge The force passing straight through the sides is called compression and the rods are very strong under compression If the force goes to one side even a little bit, the corners bend and the shape folds up at It has no built-in strength in the side-to-side direction When you push on the point of a triangle the force is passed down the center of its edges, compressing them, and into the joints at the other side At the other side the force pushes out at the joints, which pulls on the bottom bar This pulling force is tension, and these bars are also very strong under tension At no time do the joints of the triangle rotate and let the shape collapse The edge rods or pivot pins will break rst.



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Fig 530: An inspection machine with a ball screw assembly [11]





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The advantage of this drive is its low cost, which makes it the most popular drive used in industries for guideways on a working table But this transmission drive is not a good alternative for short travel distances such as in ultra-precision machines This drive has a high tendency for building up a high inertia and hence leads to a loss of power in the motor for acceleration purposes since a large portion of the motor torque will be used to overcome the rotary inertia of the drive The drive has a critical speed limitation and a low stiffness that reduce the frequency response and increase the settling time Ball screws are also used in other applications such as engraving machines, medical instruments, semiconductors and laboratory equipments An example of an inspection machine utilizing a lead screw is shown in Figure 530 where the ball screw assembly is indicated as D Certain ball screws are incorporated into the table itself forming some sort of a ball rail table as shown in Figure 531 Fig 531: A ball rail table [13]

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This is what I mean when I say that triangles are strong The shape has strength built into it Another strong shape is the circle, because force at one edge tends to be redirected around the edge into compression You see circles in action in arches, eggs, and domes..

Friction drives are an alternative to ball screws to provide translational motion, and they operate by pressing a steel wheel against a steel bar When the wheel rotates, the bar moves The typical work method is shown in Figure 532 Another detailed friction drive application is explained and shown in Figure 533 The friction drive unit consists of a housed motor or a tachometer mounted on precision bearings with a hardened steel drive roller mounted on the spindle nose The motor force is achieved by traction between the

Fig. 3-1.

Fig 532: The work method of a typical friction drive [19]

drive roller and a machine mounted plain hardened ground bar Preloading the drive bar and roller together with a preloaded back up roller opposing the main drive roller create adequate friction [19]

A third force, not illustrated here, is applied by scissors to paper. This is the shear force. I mention it only to be complete. The forces, compression, tension, and shearing, all cause stress in an object. There is a lot that can be said about the static strength of structures. We looked at just two cases using a hinged link. There are other shapes, and other ways of fastening the pieces together. And then there is the math behind it all. However, we can safely ignore most of those details.

Fig 533: An intricate friction drive assembly [19]

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