2D Part Design Lesson 2 - BobCAD-CAM

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◦ Next select Add Layer and a new layer will be added to the layer list. ◦ Type in the name for your new layer and name it HOLES. (Note: If the cursor is not all ready flashing in the name field for the layer, the user can click+pause+click the text in order to edit the name.) ◦ Click on the HOLES layer icon so that a check mark appears, making it the active layer. • From our print we can see that we are going to create 10 equally spaced 0.2500” diameter holes in a circular bolt pattern, starting at 0 degrees and no holes are skipped. We also need to decide where to place the holes in the CAD window. Being that all of the radii are measure from the center it seems best that we should center this drawing around 0,0 in the workspace. Let's begin drawing our bolt pattern. ◦ In order to draw a circular bolt pattern, we can simply click on the Other menu, and select Hole Pattern. Use the following settings in the Hole Pattern edit dialog in the Data-<strong>CAM</strong> Tree Manager and click OK:
• That completes the hole pattern. Next we will move on to drawing the outside profile. Drawing the Outside Profile • Before beginning drawing the outside profile of the part, start by creating a new layer, naming the layer PROFILE, and making this the active layer. The steps for creating a layer can be found in the prior section Drawing the Bolt Pattern • We can see from the print that there is are ten 0.25 radius arcs around all of the holes that also share the same center point as the hole itself, all connected by 5” diameter arcs, with 0.25” radius fillets in between. Noticing that all of these shapes are exactly the same, we will draw one, and use the Rotate command to save a lot of drawing time. ◦ First lets draw the 0.25 radius arc that shares the same center as the hole set at 0 degrees. ▪ Start by clicking the Arc Menu and selecting Arc Snap. • Enter 0.25 for the Radius • Leave the Start Angle and End Angle at 0.000 and 360.000 respectively. ▪ Next while holding the Shift key down on your keyboard select the farthest right hole in the bolt circle. This will activate the snap points allowing the user to select the arc center. Click the center snap point to create the new arc. The result should look as follows:
Page 1: 2D Part Design Lesson 2 For this le
Page 5 and 6: ◦ Now that our two arcs have been
Page 7 and 8: ▪ everything in the workspace to
Page 9 and 10: • In our print, notice that the r
Page 11 and 12: ◦ Finally click OK in the Data Ma
Page 13: ◦ Complete the function by clicki

2D Part Design Lesson 2 - BobCAD-CAM

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