Draw Ellipse From Circle 45 Degree

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Ellipses with Degree?

Author	Message  Topic Search Topic Options
dery Members Profile Find Members Posts Groupie Joined: 31.Jan.2018 Location: United states Using: AutoCAD 2014 Condition: Offline Points: 53	Topic: Ellipses with Caste?     Posted: 27.Aug.2018 at 17:19
	What is meant by ellipses with degree (please meet below epitome for more than detail) and how practice y'all draw it?
philippe JOSEPH Members Profile Detect Members Posts Senior Member Joined: 14.Mar.2011 Location: French republic Using: AutoCAD Mechanical 2017 Status: Offline Points: 1310	Posted: 27.Aug.2018 at 17:33
	Hello dery, please observe an example of ellipses with caste. In fact an ellipse is a circle that you wait on its side with a certain angle ( degree ). If you have an angle of 0° you volition simply see a line, if you take an angle of 90° yous volition see the circle. I hope this volition be cocky explanatory because I'1000 at abode without AutoCAD.
philippe JOSEPH Members Profile Discover Members Posts Senior Fellow member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1310	Posted: 27.Aug.2018 at 17:37
	Dery, what yous see on the picture are old drawing plastic parts to be used on the drawing board. If y'all desire to depict your examples you tin practice it in 3D or draw a circle and practise some "angled projection". Edited by philippe JOSEPH - 27.Aug.2018 at 17:40
Kent Cooper Members Profile Observe Members Posts Senior Member Joined: 12.Mar.2013 Location: U.s. Using: AutoCAD2019 Status: Offline Points: 547	Posted: 28.Aug.2018 at 00:31
	dery wrote:  What is meant past ellipses with degree (please see below epitome for more particular) and how do y'all draw it? That is what is represented by the R otation selection in the Ellipse control, except that you should decrease their number from 90 degrees [i.e. utilize 65 where they show 25]: ELLIPSE Specify axis endpoint of ellipse or [Arc/Eye]: {picked a point} Specify other endpoint of centrality: {picked a point} Specify distance to other centrality or [Rotation]: R Specify rotation effectually major axis: 45 {or whatsoever} Edited by Kent Cooper - 28.Aug.2018 at 00:32
philippe JOSEPH Members Profile Find Members Posts Senior Fellow member Joined: 14.Mar.2011 Location: French republic Using: AutoCAD Mechanical 2017 Status: Offline Points: 1310	Posted: 28.Aug.2018 at 07:47
	And the next step is your AutoCAD cartoon second or 3D + flatten.
philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: French republic Using: AutoCAD Mechanical 2017 Condition: Offline Points: 1310	Posted: 31.Aug.2018 at 08:11
	Kent COOPER, I accept uploaded the AutoCAD file : ELLIPSES WITH DEGREE.dwg in the CAD/BIM Blocks library because I'chiliad trying to draw the cubes and the ellipses. For the ellipses your methods looks advisable to the case but I'm not abble to describe the cubes in second ( dimensions x , y  , z in relation with the angles defined in the 3 figures ). Can you help ?  I take tried to draw information technology in 3D with the concept define in the exam : Figure 11.47 . Angle size determines viewpoint of object just it doesn't work vith the command viewpoint. Dery accept y'all stock-still your drawing trouble because not me. Edited by philippe JOSEPH - 31.Aug.2018 at 08:12
Kent Cooper Members Profile Find Members Posts Senior Fellow member Joined: 12.Mar.2013 Location: United States Using: AutoCAD2019 Status: Offline Points: 547	Posted: 10.Sep.2018 at 18:24
	Apparently the x-degrees-upward-on-one-side and 40-degrees-upwardly-on-the-other in the original left-most prototype don't hateful the same thing as the "From the Ten Axis" and "From the XY Airplane" angles in your VPOINT dialog box images.  I'1000 not certain how to translate between them, but it certainly would involve some potentially complex trigonometry. But I now question the legitimacy of the original epitome.  I did manage a fully-2D way to get a 55-caste- and ii 25-degree-rotation Ellipses to sit cleanly in Lines representing a "cube" with those x- and 40-caste base-side angles.  But I'grand reluctant to depict how, because if all was legitimate, the Ellipses that touch shared "cube" edges should impact them in the same place, but they don't -- their touching points are a [not huge but] meaningful distance apart.  I suspect that for those nice round-number base of operations-side angles of 10 and forty degrees, the true "rotation" or "degree" of those Ellipses would non actually be their squeamish make clean 55 and 25 degrees.  Practise you know where those numbers come from, i.due east. how the rotations are derived from the base of operations-side angles?  It would take me some pondering to figure what they should really be, and maybe I'll discover time to try to effigy that out later....
Kent Cooper Members Profile Find Members Posts Senior Member Joined: 12.Mar.2013 Location: U.s. Using: AutoCAD2019 Status: Offline Points: 547	Posted: x.Sep.2018 at 21:18
	That turns out to be the case -- the true "rotation" or "caste" of the Ellipse on the left face of the left-virtually image [with the base-side angled up at 10 degrees], that they testify equally 55 degrees, would in reality exist a hair over 57 degrees. Likewise the one on the peak face of their middle epitome. Edited by Kent Cooper - 10.Sep.2018 at 21:20
philippe JOSEPH Members Contour Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1310	Posted: 10.Sep.2018 at 21:38
	Hello Kent, thanks for the effort to explain this for me and Dery. Unfortunately I'm non enough practiced at maths for you and from all the years that I did use informatics I know, considering I have used the drawing board and then the computer and once more the cartoon board, etc... again till 1995 the beginning of the "all computer era" for me that when y'all use a computer you loose the power of "thinking" or at least how to use a hand calulator. My actual trouble is to solve dery'southward exercise and of grade if I have enough time I volition do some "hand viewpoint test" to point to the right direction and drawn in 3D and then flatshot the result but : I would be interesting to realize information technology "directly" in 2d and this will but be possible if I can drawn these cubes in 2D and and then try and draw these ellipses with degrees that wil have to affect the sides of the 2D cubes. I know how to draw "by mitt" 2D or 3D" automaticaly with the estimator" isometric views just not these 3D "special point of views", can you aid me ( and Dery if he still want )? Edited past philippe JOSEPH - 10.Sep.2018 at 21:38
Kent Cooper Members Profile Observe Members Posts Senior Fellow member Joined: 12.Mar.2013 Location: United States Using: AutoCAD2019 Status: Offline Points: 547	Posted: 11.Sep.2018 at 17:42
	I'm not sure how to get a 3D view to be from the correct direction that Flattening it will result in the desired base-edge angles, either.  If I retrieve of something, I'll write back. In 2D construction, the "problem" in the cartoon file of the dimensions of the edges has a solution for a specific caste-of-rotation of the tiptop-of-cube Ellipse.  The 1 on the "left" face, in the left-most image in the initial bulletin here, is (because the other two have their Ellipses rotated at the aforementioned "caste") a rhomb, so 50 units is appropriate there.  And because it's a rhomb, you can build the advisable Ellipse pretty easily [for the moment, consider just that left face]: Make an Ellipse using the corners of the rhombus for the centrality endpoints [the dashed-line larger green one], put a Line across the middle of the confront [yellow], and Calibration the Ellipse down, about its CENter, using the Reference option with the two magenta points as the Reference distance [MIDpoint and Apparent-intersection], and the terminate of the yellow Line equally the new distance.  Either of those Ellipses will requite you lot its axis aspect ratio in the (assoc 40) entry in its entity data -- the real rotation of it is the bending whose sine is that number [included in the adjacent epitome]. That image also shows i mode of hands making the other two sides, also as rhombi, as a true isometric version would be, making their Ellipses equally easy to depict in the aforementioned fashion [blue]. BUT in the original image, the Ellipses on the meridian faces of the cubes all have their major axis horizontal, which the above does not.  For that, the desired degree of rotation of the Ellipse affects the edge dimension along the forty-degree sides.  Determining that involves drawing an Ellipse with its major axis horizontal, and the desired rotation, Rotating copies of that appropriately and so that cartoon bounding boxes around them [the dashed grey below -- I have a routine to exercise that] and Rotating those back gives edges parallel to the "cube" edges, and so some Moving and Scaling [with Reference option] to get them in the right positions and sizes, and the far-side cube edges in the right places. I'll upload the CAD file that both these images came from -- same place and same file name with -2 added at the cease.

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