Learning Module 6 The PC Circuit* Except for the colors, your fin...

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Learning Module 6 The PC Circuit* Except for the colors, your final project MUST look like this at the end: (Go to the proceeding slides to learn more details about the drawing) 1. You are looking at a PC board. The board itself is just a partial rectangular object. BUT, what is absolutely important is that you MUST draw the lower left corner of the board at 0,0. Of course you then must trim it to make it look like it is. Make sure you create the board on its own layer. 2. Ok…now the items you are looking at on the PC board are as follows: • DONUTS (Command: Donut) • Polylines (PLINES) (Command: PL) • 2D Solid (Command: Solid) • Ordinate Dimensioning 3. DONUT (see next slide for info on DONUT creation): FIRST, make a layer called “DONUTS.” This command creates a two-dimensional (flat) donut (or Lifesaver® candy!) shape. Since the object ends up to look like two concentric circles, the command asks for the diameter of the inner circle first and then that of the outer circle. Next it will ask you for the location. If you click anywhere in the drawing area a “filled” donut shape will appear and the color of the fill will correspond to the color of the layer the donut is being created on. For this drawing, you have ALL of the (X,Y) coordinates necessary to create all of the donuts required (look at the x-value and the y-value dimensions corresponding to the donuts.) As long as you are creating donuts, the command is active. 4. SOLID (for 2D solid NOT 3D solid) command: Creates solid-filled triangles and quadrilaterals (4- sided objects.) You are required to create a 4-sided solid shape that looks like a rectangle and then using Rectangular Array creat the row at the bottom of the PC board. FIRST: Create a “SOLID” layer; SECOND: Find the four corner (X,Y)’s of the LEFT-MOST rectangular shape - ignoring the triangular hat which is on top of the many of the rectangular shapes. All of the dimensions are there. You just have to add some values to get all of the X and Y values To get the rectangular shape you MUST follow an order of X,Y input that is shown on the right (actually inputting the values in a zigzag form results in the same rectangle: When you type SOLID at the command line, The following prompts are displayed: First point: Sets the first point in the 2D solid (in X and Y) Second point: Sets the first edge of the 2D solid. Third point: Sets the corner that is opposite the second point. Fourth point: The fourth point is diagonally opposite the first point. Pressing Enter at the Fourth Point prompt creates a filled triangle. Specifying a fifth point creates a quadrilateral area. DON”T BE AFRAID to try this command and create a few things before you actually create the first rectangle 1 2 4 3 5. After successfully creating the leftmost rectangle as instructed in the previous step, you need to rectangular array. 6. Now you can create the triangular plines on top of the arrayed solids (having ORTHO (F9) on during this can help you draw straight upright triangular pline). Once again after you create one (on its own new layer – i.e. PLINE Layer) on top of the leftmost 2D solid, you will then array it. You know that the array command will create a cap on top of every 2D solid (SEE NEXT SLIDE). (You would then have to explode this new array and then delete the triangular plines that you do not need.) REFER to CHAPTER 9 as to how to create plines. The triangular plines that I am addressing here are simply created by having a starting width and then an ending width of 0 (zero). SEE the following slides: >>>>>>> I have zoomed into the top of the leftmost 2D soild to show you how big the triangle is. The required dimension is given but the height is not which you can decide – as long as it looks proportional and close to what you see in the drawing. 7. Array of the leftmost triangular pline: 8. NOTE: You might or might not have to EXPLODE the triangular-pline array in order to delete the plines you don’t need. ALSO NOTE: If you EXPLODE an entity, AutoCAD could move the entity to the 0 (zero ) layer. To find out, turn the layer 0 off. If you see anything disappear, that means those entities are now on layer 0. Move them to the layer they need to be on. Remember as always before submitting any project to me, to turn off have layer 0 and if AutoCAD gave you DEFPOINTS layer, also that layer and then SAVE and submit. This picture shows what your drawing looks like before you start the plines. At this point, your drawing should look similar to the picture below (again colors are optional but LAYERS are MANDATORY; So you would want to turn layers OFF and ON to make sure all objects are on their appropriate layers.) 9. After reading Chapter 9 and practicing with PLINE (PL) command in a practice drawing, create all the plines required from the CENTER of the DONUTS and ending at the MIDPOINT of the TOP of the SOLIDS that have a pline cap on them. After reviewing the required material, you should come to know that the pline command stays on and as you <CLICK> (and YES! You are allowed to “eyeball” the location of every bend except for the START and ENDPOINTS) …so as you <CLICK> you can change from drawing pline LINE to a pline ARC by typing “L” for LINE and “A” for ARC (not CAP-sensitive.) Again, you need to practice. Bottom line your plines must look like the drawing that I have provided in the beginning of this PowerPoint. Your first pline could look like this. You should use a combination of ORTHO ON and ORTHO OFF and “L” and “A” to create the pline connectors: In this example you are looking at 3 segments: Line, Arc, Line After you finish all of the linear/arc plines, your drawing should resemble the picture below. Notice that for the moment your plines extend all the way to the CENTER of the donuts. 10. Using the trim command you need to trim all of the plines at the donuts with the donuts as the cutters OR use simple trim command (picture to the right). If you trim the wrong entity during trimming simply type “U” followed by <space bar> and continue trimming until your drawing looks like the next slide: 11. Now you are left with creating the triangular plines in a somewhat similar way to those on top of the solids. HINT: Create one perfectlooking triangle from the center of a donut of your choice; then trim it so the center of the donut is again empty; THEN copy that triangular donut based on the center of the donut to every one of the other centers of the other donuts. Lastly, ROTATE each of the newly copied triangles IF NECESSARY to align them with pline they are in contact with. Your finished project must look as shown below. Again, you pick the colors and NO DARK COLORS! As you can see my screen is black and I would have to change the colors of your project to see them. FULLY DIMENSION by Ordinate dimensioning under the Annotate tab (just play with this type of dimensioning to become familiar

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