Design and calculate Gears and Bearings

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NARRATOR: After completing this lesson,

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you'll be able to develop gears for features and components,

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select standard bearings based on the requirements

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of your assembly, and connect Content Center Library

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components to your Design Accelerator components.

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We'll begin first by focusing on gears.

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In the Design Accelerator tools, there

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are several types of gears--

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worm gears, bevel gears, and the spur

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gear that we'll create for this assembly.

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Starting this Spur Gears Component Generator,

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you'll see there are several different design

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guides that could be used.

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For this assembly, we'll use total unit correction.

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We'll set the Diametral Pitch to nine.

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And we'll leave the center distance at four.

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For the first gear, we use 24 teeth.

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For the second, we'll use 48.

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For the face width, we can measure

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the distance from the front to the back face, getting 0.8.

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We'll set the face width for this gear to be the same.

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Then we'll change the first gear from being

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a Component to a Feature.

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This feature will be added to the existing shaft.

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We also have the option of using No Model.

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No Model is very useful if you already

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have a model of a gear in the assembly

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or if you're doing a gear train that has more than two gears.

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Selecting Feature, we'll choose the Cylindrical Face

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of the shaft and then to start playing on the shaft.

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This will give us a preview of the gear.

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Then for our Component Gear 2, we'll

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select the Cylindrical Face to be

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on the lower shaft, the start plain aligned

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to the upper gear, and making sure that the gears are aligned

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by flipping the Start Plane.

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We can calculate the gear.

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And as with all the design accelerators,

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we have the ability to go in and do our calculation

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as well to see what the results would be.

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For now though, we'll click OK and generate the files.

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This will update the large section on the top shaft

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and generate a new gear component for the lower.

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Next, we need to place a bearing on the end of this shaft.

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We'll go to the Bearing Generator.

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And for this particular model, rather

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than focusing on the calculation,

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let's focus on using the existing

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geometry and the geometry we'd like

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to set for our outer diameter to see if we can find

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a bearing that will fit, because we have fairly low load

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requirements.

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I'll start with the Cylindrical Face of the shaft

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and be able to select the N Face of the Start Plane.

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The preview of the bearing is in the gear,

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so I'll flip it and then flip the bearing over as well.

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We can set the outer diameter to be between 1.7 and 1.9

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and browse for the type of bearing that we

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need from the large selection.

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I'll ask for Tapered Roller Bearings,

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see the specific classes.

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Let's select the ANSI 19.2 and see

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that there are four bearings that fall within this category.

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Because of the space requirements we have,

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the second item will fit perfectly.

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Clicking OK will generate the bearing.

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Next, we need to go ahead and place

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a retaining ring on our shaft.

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If we look at the shaft using the Edit Design Accelerator

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tool, we can see that part of the N features,

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in addition to a chamfer and a through hole,

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were two retaining rings put in place, adjacent to where

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the bearings will be.

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Going back to the Assemble tab, I'll

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use Place from Content Center to select

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Shaft Parts, Circlips, External, and then choose an R Ring.

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Clicking OK will give us a preview of the R Ring.

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Finding the root of the ring groove

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will resize the R Ring for us and allow

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us to place it in the assembly first in the front

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and then in the back.

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This is a great example of the traditional Content Center

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components working in harmony with the Design Accelerator

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features.