Studing geometry with Autocad

[Hiddink]

Hi

 

 

i´m a newbie with Autocad and i´m trying to use this program for my exercises of "Descriptive Geometry A", so i want draw "points & lines" with predifined mesearus (exe. draw a vertical line with 5 cm)

 

I´m struggling to make angles too, once i drew a line, how do i change its angle by enserting the values for the angle position?

 

 

 

somebody help me please, its a important issue

(sorry my eng.):wink:

[ReMark]

One method for drawing a line at an angle is to type it in at the keyboard. So, for example, let's say we want a line 36cm long at an angle of 45 degrees we would type:

 

@36

 

There are several other ways to accomplish the same task and right shortly a few of my fine associates will be along to educate you further. Ta ta.

[Tankman]

As ReMark states, "at the keyboard."

 

Keyboard entries are the easiest way to enter lines,

lengths and angles.

 

This is basic AutoCAD and first if studying the program, a must.

[manhattan]

if you do have an aversion to command line entries you could draw a line of x distance using the line command. if you set ortho to on, then click the first point of your line. move the mouse in the direction you wish the draw the line, enter the length of the line & press return.

 

of course ortho will snap your lines to 90 degrees. you could use the rotate command to turn the line at a defined turning point. the dimension toolbar is self explanatory, different tools for angles & lengths, but you cannot change the angle by altering the entries as you mention

[MaxwellEdison]

I generally have my polar snap set to 30 degree increments, then add in 45, 135, 225, and 315. Anything that falls outside of those I'll either use the command line entry, or infer it from another point.

 

Also, remember the rotate command. Once you set your basepoint, you can rotate your line to your desired angle. Make sure you pay attention to the command line so you can see what type of input ACAD is looking for, and what particular options you have for your current command.

[skipsophrenic]

The other thing to remember when drawing angles in AutoCAD, is a line drawn

at 0 degrees would not be vertical, it would be Horizontal.

 

And the angles rotate anti clockwise NOT clockwise - see image below

 

[ReMark]

What did I tell you? Are these guys great or what?

[Hiddink]

Indeed

 

thank u guys ... :D

[Tankman]

The other thing to remember when drawing angles in AutoCAD, is a line drawn

at 0 degrees would not be vertical, it would be Horizontal.

 

And the angles rotate anti clockwise NOT clockwise - see image below

 

[ATTACH]8935[/ATTACH]

 

I get so many drawings that are laid out clockwise, what a turn off!

Nice post skipso, can we send this via bulk mail to some engineers we all know 'n love?

 

I often see 0° at 6 o'clock, 90° at 9 o'clock, etc.

Feel like I'm workin' backwards!

[mugshot]

line> pick on the spot where you want it, hit

[skipsophrenic]

I get so many drawings that are laid out clockwise, what a turn off!

Nice post skipso, can we send this via bulk mail to some engineers we all know 'n love?

 

Feel free, it only took 2 mins to draw.

 

I often see 0° at 6 o'clock, 90° at 9 o'clock, etc.

Feel like I'm workin' backwards!

 

Nice, very nice, i'm getting a sense of "Dé ja vué"

[Tankman]

Feel free, it only took 2 mins to draw.

 

Nice, very nice, I'm getting a sense of "Dé ja vué"

 

As a youngster, I always thought clockwise was correct.

 

Now I know, counterclockwise is the only way!

 

I get a little sick when I receive drawings to work with that are all backwards, makes work a bit more difficult.

And to make it worse, the same professionals continue working wrong. What's with that?

[skipsophrenic]

That's because an angle measure goes forwards, so they go by that,

so in essence you could say that the whole worlds BACWARDS! LOL

[boyo]

I use "polarang" command if i need to draw lots of lines at an odd angle. this will let you add any angle to the polar tracking and set it as snap to angle.

[boyo]

and I was struggling with anticlockwise reality when learning autocad. cause everything from writing to checking the time involves clockwise perception. then again I like oldfashon watches. I think there is an option somewhere to set clockwise rigour in autocad. And you can always mirror components as long as text is not present.

[skipsophrenic]

And you can always mirror components as long as text is not present.

 

If you've got your MIRRTEXT variable set to 0, the text will still apear with everything else, but it WON'T read backwards.

[manhattan]

And you can always mirror components as long as text is not present.

 

you need not worry about you text mirroring if you use the MIRRTEXT toggle

 

EDIT: Doh!

[sumeetppatel]

For your knowledge, there are four different methods to draw a line:

absolute, relative, polar and direct.

 

absolute uses the origin as reference and asks for ordinates. Its simple workiing with it if u r new. type x,y cordinates

 

relative uses the current position as origin. syntax : @x,y

 

polar uses current position as origin and asks radius and angle with repect to horizontal, as in polar co-ordinate system. syntax : @x

 

the fourth method of drawing a line by pointing the coordinates directly with mouse.

 

 

 

for using any of the above four. type l and enter. it will go on asking coordinates. mention it in any of the form at any time or click the point u wanna go.

 

 

 

use ro command to rotate the lines. type ro and enter. select the basepoint around which the line will rotate, type angle and u r thru.

[Bill Tillman]

To add my 2 cents here....it's been more than a 1/4 century since I was in a Descriptive Geometry classroom, but as I recall we did more work with the "Z" axis than just the "XY" plane. It was not hard to understand but difficult to visualize how a line 12 inches long could look only a few inches long depending upon the established line of sight.

 

Perhaps this question is more in depth than first glance would show. But that being the case, then there is no real easy way to construct lines unless you know the beginning and ending coordinates of said line. And even then AutoCAD will simply show the line in the current view, which although accurate still looks like a simple line in the XY plane.

 

And a one other point about the "Clockwise vs Counterclockwise" direction for angles. Remember there is no law governing this rule, it's just accepted practice by most parties. And when dealing with "Infinity" which AutoCAD allows you to do, there is no right or left, or up or down, until you establish your point of origin. And even then, the subject of direction is based on the eye of the beholder.

[edgarcia897]

Hey mugshot! That is really cool. I did not know you could do that.