engr 111 class 2.1 sketching, lettering, and autocad basics
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ENGR 111Class 2.1
Sketching, Lettering,and AutoCAD Basics
Readiness Assessment Test 2.1.1 Individually you will be given 1 minute to
respond to the following question:
What is the standard style lettering used on engineering drawings?
Lettering The style of engineering lettering
we will use in this course is Single Stroke Gothic Lettering
An example of the characters is shown in Figures 1.4, 1.6, and 1.7.
Notice that only capital letters are demonstrated, since we will use only capital letters on drawings
Pencil Techniques The best pencil for
lettering on most surfaces are the H, F, and HB grades.
Hold your pencil in the position shown. It should make approximately a 60o angle with the paper.
Single Stroke Gothic Lettering
Lettering with Fractions
Question Take 2 minutes and discuss as a
team why it is called Single Stroke Gothic Lettering
An alternative to Single Stroke is: This is Fancy Lettering
Gothic
Goth·ic (g¼th“¹k) adj. Abbr. Goth. 1.a. Of or relating to the Goths or their language. b. Germanic; Teutonic. 2. Of or relating to the Middle Ages; medieval. 3.a. Of or relating to an architectural style prevalent in western Europe from the 12th through the 15th century and characterized by pointed arches, rib vaulting, and flying buttresses. b. Of or relating to an architectural style derived from medieval Gothic. 4. Of or relating to painting, sculpture, or other art forms prevalent in northern Europe from the 12th through the 15th century. 5. Often gothic. Of or relating to a style of fiction that emphasizes the grotesque, mysterious, and desolate. 6. gothic. Barbarous; crude. --
Goth·ic n. 1. The extinct East Germanic language of the Goths. 2. Gothic art or architecture. 3. Often gothic. Printing. a. See black letter. b. See sans serif. 4. A novel in a style emphasizing the grotesque,
mysterious, and desolate. --Goth“i·cal·ly adv.
Single Stroke Gothic Lettering
Created by Mr. C.W. Reinhardt First published in 1893 “Engineering News” Adopted as the ANSI Letter Form in 1935 ANSI/ASME Standard Y14-1992 continued
using Mr. Reinhardt’s style as the modern day standard that we use in this course
REF: ENGINEERING GRAPHICS 6th Ed. Giesecke, Mitchell, et.al 1998
Readiness Assessment Test 2.1.2 Individually respond to the following
question. You will be given 1 minute:
Define SKETCHING
As a team prepare a one sentence definition of SKETCHING. You will be given 3 minutes to complete this assignment.
Sketching Sketching is a rapid, freehand
method of drawing without the use of drawing instruments. Sketching is also a thinking process and a method of communication.
Sketching This is not artistic sketching, but
technical sketching Emphasis will be on sketching
geometric figures to represent features of objects
Medium grade pencils work best for sketching
All lines should be dark enough to standout from the page
Alphabet of Lines
Sketching Techniques
Sketching techniques Use very light construction lines “Box in” the rough outline of the
object Darken only the lines you wish to
keep Clean up the edges and rough
spots
Why CAD? Computer Aided Drafting. Tool engineers use to create
designs. Easier and more efficient than
drafting by hand. Consistency between users.
Today’s AutoCAD commands
Drawing setup– SNAP– GRID
Display control– ZOOM– PAN
Drawing– LINE– MTEXT– CIRCLE– ARC
Editing and inquiry– ERASE– DDEDIT– TRIM– FILLET– UNDO– Modify properties– Grips
General Concepts– Layers– Ortho Mode
Entering AutoCAD Log on to the
network Double click on
AutoCAD icon Select Use a
Template– Find drawing
template A-Blank.dwt
– Select OK
Grid and Snap Grid is just a visual aid for your
drawing Snap allows you to specify precise
coordinates when using the mouse They are modified with the GRID
and SNAP commands Neither affect anything already
drawn They can be changed on-the-fly
Function Keys Function keys turn GRID and SNAP
“modes” on and off– F7 - Sets GRID mode on/off– F9 - Sets SNAP mode on/off
DO NOT DRAW ANYTHING WITH SNAP TURNED OFF!!!!
Status line at the bottom The status line at the bottom of the display
tells you whether any of the modes are on or off.
The “pressed” modes are on. (SNAP, GRID, ORTHO and MODEL in the picture below)
Drawing Objects Drawing commands are found
on the toolbar located at the left of the screen
The four of interest today are Line, Arc, Circle, and Mtext
These may be abbreviated from the keyboard using the first letter(s) (e.g.)– Line - L– Arc - A– Circle - C– Mtext - MT
Line
CircleArc
Mtext
The Line Command The line command requires two or more points and will
connect them with straight lines Points are selected by pressing the left mouse button Pressing Enter or Escape will terminate the command
The Circle Command The Circle command has several options
which change the required input– Center, Radius - This is the default and
requires a point and either a second point (which will be on the circumference) or a radius type via the keyboard.
– Center, Diameter - as above, but the second point will not lie on the circumference, it will define the diameter. To use this option, you must type “D” prior to selecting the second point or entering the diameter.
– Other options will be discussed as needed
The Arc Command While the Arc command
can be accessed via the toolbar, the pulldown menu offers easy access to the various options within the Arc command
For most applications the Start, Center, End option is most useful
The Mtext Command The Mtext command has the most options
of any of the commands we have yet seen. Most will be obvious in their use.
Mtext is a full multiline text editor. It supports word wrap, bold and italic, and
multiple fonts. As inputs it needs a starting point and the
width of the text. Given these, a dialog box is displayed as
shown on the next slide.
The Mtext Dialog Box
Working with Layers Layers are used to
control the type of line that will be drawn
They are pre-defined on the templates used for this class
They are accessed from a dropdown list as shown to the right
Layer Control Consider two possible states for a
layer– ON/OFF
ON/OFF controls whether the layer can be seen on screen
Nothing on an OFF layer can be selected using the mouse
Display Control ZOOM -- scales the screen view to an
area of the drawing surface– “Window” will zoom down to a window– “All” will zoom out to show the larger of the
drawn entities or limits– Realtime allows you to shrink or enlarge the
display in real time. PAN -- moves around on the drawing
surface
Paired Exercise Start a new drawing. Use template A-Blank.dwt You have 15 minutes to practice
drawing lines and arcs using different linetypes and layers.
Save your solutions on a floppy disk.
Completing the Title Strip Rather than using the MTEXT command to
compete the title block, it is simpler to edit the existing text.
The command to do this is DDEDIT, or find “Text…” under the Modify pulldown menu.
Or you can double click on the text to be edited.
Title Strip For today, leave Team and File as “00” Complete Drawn by with Last, First Name Date in Month/Day/Year format using the
DUE DATE (9/29/02) Make sure you include your section
number
Printing in AutoCAD Printing is done via
the PLOT command Always plot limits Set origin to “Center
the Plot” Always plot at a scale
appropriate to the drawing (normally 1:1)
ALWAYS GET A FULL PREVIEW BEFORE PRINTING
Plot Device Settings
Under Plot Device, make sure the printer is selected and the Plot Style Table is set to “endg105.ctb”.
Homework