Practice exercise

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This is a practice exercise video solution.

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To get started,

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let's open the supply data set,

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Joint Limits.3D.

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This design already contains a revolute joint,

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a slider joint,

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and a motion link.

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The motion link allows the object with a slider joint

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to move back and forth while rotating the object with the revolute joint.

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Let's go ahead and revert the position.

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We also have a few blocks that are free to move about.

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We need to start by applying more joints to the situation,

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and we also need to limit some of the joints we already have.

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So,

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to get started,

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let's go to assemble and select as built joint.

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We'll change the joint type to be planer

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and select one of our blocks,

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block one,

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and our base.

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The position for the block doesn't really matter,

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but let's select the center of the cylinder,

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and then we'll say,

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OK.

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Right click and repeat,

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once again selecting a block,

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the base,

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and then the center position of the cylinder and say OK.

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Now each of these blocks is free to move around on plane.

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Let's revert the position and let's take a look at our slider joint.

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We right click and select edit motion limits.

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Inside of here,

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we have a minimum and a maximum value set to minus 3.5 inches and plus 3.5 inches.

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We need to activate these by selecting the check marks.

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Once we say OK,

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this is going to limit the overall motion of the block,

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preventing it from going past the edge of our base.

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Let's select revert position.

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Joints are great to represent mechanical motion,

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however,

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they can't fit all situations.

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In some instances,

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we may need to use contact sets

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to represent physical interaction between components.

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From our assemble menu,

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we want to select enable contact sets.

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From here,

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we'll right click on Contact sets and create a new contact set.

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This will be between block one

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and our wiper arm,

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and we'll say,

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OK.

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Repeat the process

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using block 2 and the wiper arm before saying OK.

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Now,

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we should have a positive interaction between each block and the wiper arm.

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Let's go ahead and move the slider object back and forth,

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noting that it is pushing each block out of the way.

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Let's go ahead and select revert position.

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Using a combination of joints,

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joint limits,

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as well as contact sets,

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enables us to fully represent the motion inside of this simple assembly.

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It's a good idea to play around with

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different options when creating your own assemblies.

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Make sure that you use joints and

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as-built joints to represent simple mechanical motion,

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but explore other options like motion links as well as contact sets when

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you have more complicated problems that can't be easily represented with joints.

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After we're done,

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go ahead and save this file before moving on.