Cam - Wildfire HACER

8/11/2019 Cam - Wildfire HACER

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ME-430 INTRODUCTION TO COMPUTER AIDED DESIGNCAM CREATED USING GRAPH FEATURE

Pro/ENGINEER Wildfire 2.0

Dr. Herli Surjanhata

Use Notepad or Text Editor in Unix system to create the following file calledcam_disp.pts. The point coordinates represent the cam angle follower

displacement plot.


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Selectmmns_part_solid

as the Units.

Note that the Units

for the cam will bemillimeters.

Click OKbutton.

Create a thin cylinder with a hole vertical up by extruding two concentric circular

sections. For this protrusion use

TOP as sketching plane

RIGHT as right reference for orientation of sketching plane

See Figure below for dimensioning.


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Create a DATUM GRAPH to define a dimension on a cam to produce a desired

variable offset of the follower as the cam rotates.

From Insertpull-down menu, select ModelDatum -> Graph


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Enter a name for the feature:

camgraph

Create a coordinate system to identify the origin of the graph.

Click the Create reference coordinate system icon.

Pick the lower left corner of the screen.

Create horizontal and vertical centerlines through the origin of the coordinate

system. Use - spline icon to sketch and dimension the following

curve:


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Modify the overall dimension to 360 as shown above.

Note that pick the spline curve as shown above.

Click the spline curve, then select the Modifyicon.

.

Pick Filetab.

Make sure the Cartesianis selected.

Select the coordinate system created in the

previous step.

Click the Open file icon.

First point

Second point

Third point


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Opencam_disp.pts.

Answer Yeswhen asked Doyou want to continue?

Create a horizontal centerline below the coordinate system, and create a newcoordinate system at the intersection between the newly created horizontal

centerline and vertical center line. Delete the old coordinate system, and dimensionthe vertical distance between the two centerlines 5 mm:

Click this icon to continue.

Create the sweep using the graph to control section dimensions as follows:


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Insert -> Variable SectionSweep

Pick the bottom

edge of thecylinder.

Note: Pick the

front bottom half

of the circle first,then while holding

the Shiftkey pickthe second half of

the circle locatedon the bottom

back.

Pick theSweep as solid tool.

Pick the Sketch tool.


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Create a rectangle aligned on one edge

to the cross hairs, and change onlytheheight to 8 mm. See dimensioning

scheme in Figure.

From Toolpull down menu, selectRelations.

The width of the rectangle (sd4in theFigure) is controlled by the graph feature

using the relation and call to the built-infunction evalgraph. Add the following

relation for the width sd4of rectangle.

In the message window box, type in:

/* use evalgraph to determine dimension

sd4 = evalgraph (camgraph,trajpar*360)


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Click OKto accept the relation.

Pick the to continue.

Click the icon to finish.

Note that:Camgraph & trajpar*360 are arguments. Camgraph is datum graph name, and the

trajectory parameter trajpar goes from 0 to 1.

Create a cut for keyway with the dimensions of 7 mm width and 4 mm height.


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Create a protrusion of your name on the top surface of the cam.

Pick the icon.

Make sure that Place Along Curveis

checked.

Also replace NJIT with your name.


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Finally, add the necessary rounds and chamfers.

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Cam - Wildfire HACER