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Assignment No. 1

Name: Umair Zahid

Reg. No: 2011433

FMECAD/CAM

ME 418

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Steps for creating a Helical Gear

1) Make an extrude for the gear blank.

2) Go to Tools Parameters from the main menu. Create the input parameters and enterthe values as shown below using the add button.

3) Go to Tools Relations from the main menu and enter the relations.

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4) Create three circles for Outer diameter, Base diameter and Pitch diameter using sketchand name them as shown below in the model tree. Relate the dimensions to therespective sketches.

5) Create a new coordinate system at the center of the gear blank using the datums andthe front face . Name it GEAR_CSYS for reference purpose. Make sure that the Zdirection points outside, X horizontally and Y vertically.

6) Now the involute curve has to be created. Go to Model Datum Curve Curvefrom Equation. Select GEAR_CSYS as reference coordinate system. Click onEquation and enter the equations in the text window as shown below.

7) Create a sketch for transverse_tooth_thickness at pitch diameter from the intersection point ofinvolute curve and Pitch diameter and relate thedimension to the parameter. Create a new point atthe center of this curve using datum point option.

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8) Create a new datum using the point created in step 9 and the center axis of the gear asshown in the image. This will be used to mirror the involute curve.

9) Mirror the involute curve using the datum created in step 10.

10) The helical path (helicoid) has to be created now through which the teeth section willsweep. To do that, go to Model Sweep Helical Sweep. Click Surface icon in thefeature dash board. Select the datum created in step 10 as the sketching plane for this.

For sweep profile, draw a line from the start face to the end face using references.Make sure that the start point is from the face where you modeled the transversesection. Draw the center line. When done, click ok and come out of the sketcher.

When asked for pitch, type lead in the input area.

To define the section, draw a line from the circle center to the center line of the gear.

Complete the helical sweep feature.

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11) To sweep the transverse gear tooth section along the helical path, select the Sweepoption under Model tab. Pick the outer edge of helicoid as trajectory and select solidand the other options as shown below.

12) To draw the section, select the sketch icon. Use Projectoption to add the edges of the features and Arc option forOuter diameter and Root diameter. Trim all other entitiesexcept for the teeth section.

13) Create the chamfer and radius.

14) Group the variable section sweep, radius and the chamfer in model tree.

15) Pattern this group using the center axis of the gear. 36 teeth for 360 degrees.

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16) Add center hole and chamfer. Hide the curves, surfaces etc.