Lesson4
Lesson (Week) #4,
EGR-110. Burgener, Monday September 18th, 2000
Administrative notes and announcements:
Returned homework: Handout assignment "page 27" on orthographic missing lines. A few students did very well and won't have to do the next homework (page 26, handed out the first class, due in 2 more weeks) with similar puzzles on it.
New AutoCAD Commands students should know AFTER this lesson:
SCALE irp265
LAYER p68 irp154
Linetypes p68 irp156, NOT 167 NOR 169
LTSCALE p100 irp169
VIEWRES p342 irp352
MIRROR p111-112 irp178
STRETCH p341 irp292
OFFSET irp ?
ARRAY p? irp12
Note: POLYGON and RECtangle use Polylines, not regular Lines
.. POLYGON p145-146 irp233
.. RECtangle p146 irp245
PLINE irp223
PEDIT irp217
EXPLODE irp114
INSERT irp147
Match Properties icon irp173
Homework due next class:
. . Note: we decided the page 158 221 assignment would be worth 25 points.
Drawings on page Page 158, FIG. 6-2-C, the Rocker Arm, AND Page 221, FIG. 7-3-G, the Gasket, in the same AutoCAD file. Begin by drawing each full-scale. You’ll find the Gasket will be very small compared to the Rocker Arm. When the Gasket is complete, SCALE it up to make it 25 times larger. Once this is done, it’ll be about the same size as the top and front views of the Rocker Arm. Use several layers with linetypes (see chart below). Only the border (see below) should be on layer zero.
On layer zero, place a RECtangle around both problems, starting at 0,0 for the lower left corner and extending to 500,375 absolute coordinate. In the lower right corner of the border, place in 10 unit high text, your name, the date, EGR-110-40 and the name of your drawing file.
Ignore dimensions and tolerance notes (H7, H8 etc). You may make the centerlines for the small holes of the gasket like in Week #3 lesson outline (instead of curved), if you want.
Add 4-unit 45-degree "jays" (arcs) for where the "webs" join the cylindical parts. Suggest fillet them first with R=4, then BREAK off half the arc with MIDpoint Osnap.
The layers structure should be:
|
Layer Name |
Color |
Linetype |
Usage |
|
0 |
White |
Continuous |
Large border rectangle |
|
Object |
Green |
Continuous |
Visible lines in both views |
|
Center |
Red |
Center |
Centerlines |
|
Center2 |
Red |
Center2 |
Centerlines on very small circles |
|
Centerx2 |
Red |
Centerx2 |
Centerlines on large circles |
|
Hidden |
Cyan |
Hidden, 2, or x2 |
Lines "inside" object |
|
Text |
Magenta |
Continuous |
All text |
Your drawing file will be collected (somehow) at the start of class next week, on Sept 25th. Use the screen capture below for quidance, but don't worry YET about the ASIZE title block and border.
Wait until the end to work the little "jays" for the "run-outs" and the centerlines on the gasket. These items are tricky. Although usually the text within the title block should be on layer Zero withthe rest of the title block, for now, make the text on layer Text, in Magenta color, even if you use the ASIZE.dwg title block. This is for consistency with the rest of the students, who don't use the ASIZE.dwg.
Below shows the completed Page 27 puzzle sheet we went over in class tonight. Arning: you might see one or more of these puzzles or similar versions on the upcoming quiz in two weeks.
Due in 2 weeks: Page 26, handed out the first class. Very similar to the page 27 puzzles, shown above. Some students (those that recieved 10 points or more on Page 27) don't need to do the Page 26 assignment. I haven't decided yet whether I should repeat their high grade again for Page 26, or the full score. Thoughts?
Quiz! We'll have a quiz in 2 weeks. Be prepared for some of the same puzzles on page 27 or 26. Practice your AutoCAD skills. There'll be some multiple choice questions, and an AutoCAD practical exam. It'll be open book. It'll take maybe 1/2 of the class period (pretty big quiz).
Testing here: Asize.dwg border and title block drawing