New to AutoCad and Confused

[Njprince94]

Hey there,

I am completely new to AutoCad and I barely know the basics. I am here trying to duplicate this design which seem's to be fairly simple. To my understanding you can draw a quarter of it and mirror the image for the rest of it. I am not sure where to start as I have very little experience with this program.

If anyone here can guide me through it and/or duplicate this design on autocad for me I would really appreciate it. It has to be on a 1:1 scale.

[ReMark]

Start with a circle that has a diameter of 154. Draw a second circle with a diameter of 122 using the center of the first circle as the center for the second. Draw the vertical and horizontal centerlines. Do you know how to create different layers and assign a linetype and color to the layer?

[Njprince94]

Thank you so much for the reply. Alright so like I said I am very new to AutoCad so please bare with me :p Am I supposed to change the dimension style or units to metric? The drawing is in metric so I have to make an exact replica of it. I tried to make a circle with a diameter of 154 but it goes off the screen? I also do not know how to create different layers or assign linetypes.

[ReMark]

Technically to do a metric drawing you should use a metric template but I'm guessing you did not do that right?

Want to see your circle? Do a Zoom > Extents. See it now?

[Njprince94]

Nope I did not, and yes!

[ReMark]

I asked about layers and linetypes because I like to put my centerlines on their own layer in a different color than my geometry.

You got all the circles drawn yet?

Do you know about Orthomode?

Have you used such commands as Mirror or Trim?

Have you used the Polar Tracking feature yet?

[ReMark]

TripleCircles.jpg
Here is one way to approach the problem.
OOps...forgot that notch on the outer ring. That's what I get for doing CAD and drinking a beer at the time.

[ReMark]

FinishedCircle.jpg
Any better?

[Njprince94]

I have only done the first three simple circles, the rest seem's jibberish to me haha. I have used the commands mirror and trim and I do not know what orthomode or polar tracking is. I'm not sure how to create those horizontal and verticle lines or those inner/outer notches. So after the last picture you put up all that needs to be done is add the dimensions by putting in text right?

[ReMark]

Orthomode constrains lines to horizontal and vertical (no lines at an angle).

Mirror is just what it sounds like. You've heard the phrase "mirror image" right?

The Trim command allows the user to use one 2D entity and trim (cut) another that crosses it.

The last picture would still have to be dimensioned, yes.