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Topic ClosedAutocad 2013
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curtie View Drop Down
Groupie
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Joined: 06.Jun.2013
Location: South Africa
Using: Autocad 2013
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Points: 39 		Direct Link To This Post Topic: Autocad 2013
    Posted: 06.Jun.2013 at 20:43
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
sean
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philippe JOSEPH View Drop Down
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Joined: 14.Mar.2011
Location: France
Using: AutoCAD Mechanical 2017
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Points: 1493 		Direct Link To This Post Posted: 07.Jun.2013 at 07:27
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.


Edited by philippe JOSEPH - 07.Jun.2013 at 07:33
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curtie View Drop Down
Groupie
Groupie


Joined: 06.Jun.2013
Location: South Africa
Using: Autocad 2013
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Points: 39 		Direct Link To This Post Posted: 07.Jun.2013 at 19:16
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.
sean
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curtie View Drop Down
Groupie
Groupie


Joined: 06.Jun.2013
Location: South Africa
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Points: 39 		Direct Link To This Post Posted: 07.Jun.2013 at 21:09
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.
sean
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heinsite View Drop Down
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Joined: 05.Feb.2009
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Points: 640 		Direct Link To This Post Posted: 09.Jun.2013 at 11:26
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.
Dave Hein, P.E.
Hawaii District Engineer
Kona International Airport
AutoCAD Certified Professional
Autodesk Expert Elite
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curtie View Drop Down
Groupie
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Joined: 06.Jun.2013
Location: South Africa
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Points: 39 		Direct Link To This Post Posted: 09.Jun.2013 at 12:36
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.Smile
sean
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philippe JOSEPH View Drop Down
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Joined: 14.Mar.2011
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Using: AutoCAD Mechanical 2017
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Points: 1493 		Direct Link To This Post Posted: 10.Jun.2013 at 07:04
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.

Edited by philippe JOSEPH - 10.Jun.2013 at 08:44
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curtie View Drop Down
Groupie
Groupie


Joined: 06.Jun.2013
Location: South Africa
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Points: 39 		Direct Link To This Post Posted: 18.Jun.2013 at 18:55
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.  Smile
sean
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Kent Cooper View Drop Down
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Points: 686 		Direct Link To This Post Posted: 18.Jun.2013 at 20:55
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.
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Kent Cooper View Drop Down
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Points: 686 		Direct Link To This Post Posted: 18.Jun.2013 at 21:07
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:
[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.]
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