Hi guys I'm struggling with this drawing, the drawing is in mm and i don't know how to get the center line on the vertical line. The measurement is 146mm from the horizontal center line.Please help.uploads/380818/IMG_20130606_0002.pdf

uploads/175428/ICG_2013_01_A.dwg
 
Hello curtie, I have done your drawing without real problems.
I had to use the UCS command to draw correctly the ellipses ( each one individually and not the second with the offset command to have 2 real ellipses ).
I had to use the offset command to draw the radiuses R34 and R45 because tangancy doesn't works on ellipses.
Is it that you see the centerlines continuous ( use the LTSCALE command to set the visibility ) or you don't succed in drawing the 2 centerlines of the ellipses ( draw a vertical line at 68 mm from the right line of 68 mm and rotate ir by 30°, then offset the horizontal centerline of 241 mm by 146 mm and you will get the center of the ellipses at the intersection.
I suppose that the drawing that you have uploaded is a paper and that you want to draw it on AutoCAD !
Instead, upload an AutoCAD copy of your test.philippe JOSEPH2013-06-07 07:33:48

Thank you for the quick reply.Yes it is a paper version and I have to draw it in autocad. I will try it this weekend.

I tried the UCS command now and this what I did, I typed UCS- enter then Z- enter Rotation Angle i typed 30. is that correct.

That's certainly one way.  But an easier way would be to select the X-Y axis symbol in the lower left corner of the model space screen and drag it to your drawing and reset the axes to the angle you need.  This is another way to reset the UCS but allows you to do so without having to know the angle.  When you're all done, simply type UCS on the command line and select World to reset it.Dave.

Hi guys, I seem to be coming along well on the drawing so far. I'm just abit confused about philippe joseph coment about offsetting radius R34 and R45. Normaly when you offset u use a existing line to offset from.

No curtie, you can offset also a circle, an arc an ellipse and that's what I did to get the centers of the the radius R34 and R45 and then draw a circle R34 and R45 to be trimmed on the ellipses and lines. philippe JOSEPH2013-06-10 08:44:09

Hi philippe joseph, how are you doing. I finally figured out a way to get R34 and R45. I use the fillet command then select radius then type in 34 and touch the horizontal line, then touch the ellipse line and its done. I do the same for the opposite side. I want to thank you for your help, I really learnt some things from you. 

You can also use the Circle command and its Tangent-Tangent-Radius option to get those R34 & R45 arcs, though you'd then need to Trim away the portion of each Circle that you don't need.

philippe JOSEPH wrote:
....

I had to use the UCS command to draw correctly the ellipses ( each one individually and not the second with the offset command to have 2 real ellipses ).
....
 
You can also do that by changing the SNAPBASE and SNAPANG System Variables, without changing the UCS.
 
And if you want to Offset an Ellipse and get a true Ellipse as a result, with its quadrant points at the offset distance from the initial Ellipse's quadrant points [the 27 in this case], check out:
http://cadtips.cadalyst.com/curved-objects/true-offset-ellipse
[The resulting Ellipse's distance from the initial Ellipse will vary at places other than the quadrant points, which is why regular Offset produces a Spline instead of another Ellipse.  So don't use two Ellipses if that matters.]
 
[Also, pardon my error in my previous post about the TTR option in Circle....  But the Fillet approach does work nicely.]

Hello Curtie, now it's me learning from you.
That fillet command working with the ellipses is new for me and my method with the offset + radius command was no good ( or it was the only option with the older AutoCAD releases that I use to have from 1995 : R13 , 2000 , 2008 and now 2012 ).
Kent was also wright to tell us about his lisp program for offseted ellipses, I will try this.

We learn everyday, even if its from newbies. I have another drawing that am strugling with, will upload the image tonight