Tài liệu CAM CREATED USING GRAPH FEATURE doc

Herli Surjanhata Use Notepad or Text Editor in Unix system to create the following file called cam_disp.pts.. Click - the Create new object icon to create a new part called CAM.. Create

ME-430 INTRODUCTION TO COMPUTER AIDED DESIGN

CAM 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 called

cam_disp.pts The point coordinates represent the cam angle – follower

displacement plot

The extension of the file must be .pts

In Windows system, be sure to include the quotation in the filename when you save the test file – see Figure

Click - the Create new object icon to create a new part called CAM

Turn-off Use default template

box

Click OK button

Select

mmns_part_solid

as the Units

Note that the Units for the cam will be millimeters

Click OK button

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

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 Insert pull-down menu, select Model Datum -> Graph

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:

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 Modify icon

Pick File tab

Make sure the Cartesian is selected

Select the coordinate system created in the previous step

Click the Open file icon

First point

Second point

Third point

Open cam_disp.pts

Answer Yes when asked Do you want to continue?

Create a horizontal centerline below the coordinate system, and create a new

coordinate system at the intersection between the newly created horizontal

centerline and vertical center line Delete the old coordinate system, and dimension the 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:

Insert -> Variable Section Sweep

Pick the bottom edge of the cylinder

Note: Pick the front bottom half

of the circle first, then while holding the Shift key pick the second half of the circle located

on the bottom

back

Create a rectangle aligned on one edge

to the cross hairs, and change only the height to 8 mm See dimensioning scheme in Figure

From Tool pull down menu, select

Relations

The width of the rectangle (sd4 in the Figure) is controlled by the graph feature using the relation and call to the built-in function evalgraph Add the following relation for the width sd4 of rectangle

In the message window box, type in:

/* use evalgraph to determine dimension

sd4 = evalgraph (“camgraph”,trajpar*360)

Click OK to 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

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

Pick the icon

Make sure that Place Along Curve is checked

Also replace NJIT with your name

Finally, add the necessary rounds and chamfers