KasbeKZ Posted April 25, 2009 Share Posted April 25, 2009 i did search and find several questions about isometric fillets, but none of the suggestions have helped me in my particular drawing. i hope i've done the attachment properly. what i am trying to do is fillet (with radius 5) the other two corners of the triangle in the very middle of the drawing. it is a triangle cut out of a 3-D plane, so i haven't been able to follow my usual procedure on two of the angles. i usually will draw from the corner out 5, then in 5, and have the center of my ellipse. but that will not work with these acute angles. that process causes the ellipse to overhang the triangle no matter which way i do it. any help will be greatly appreciated and i appologise for my poor description. isometricdrawing.dwg Quote Link to comment Share on other sites More sharing options...
KasbeKZ Posted April 26, 2009 Author Share Posted April 26, 2009 is nobody answering because they don't know how or because this is over-asked? Quote Link to comment Share on other sites More sharing options...
kencaz Posted April 26, 2009 Share Posted April 26, 2009 I don't draw in iso so I would not be much help regarding your question but, personally I would draw the part in 3d which would solve your fillet problems and allow you to plot multiple views with a single model. KC Quote Link to comment Share on other sites More sharing options...
KasbeKZ Posted April 26, 2009 Author Share Posted April 26, 2009 thanks for the suggestion. i would do that, except for the fact that everything is completely done except for that fillet and i'd really rather turn it in without than start over lol. thanks though. i'll experiment with that next time Quote Link to comment Share on other sites More sharing options...
chaseeno Posted March 26, 2018 Share Posted March 26, 2018 9 years later and still no solution:(:( Quote Link to comment Share on other sites More sharing options...
Cad64 Posted March 26, 2018 Share Posted March 26, 2018 9 years later and still no solution:(:( As Kencaz mentioned previously, create a 3D model and then you can view it from any angle and you won't have to spend a lot of time and effort trying to figure out fillets and whatnot. I created this model in about 20 minutes. Obviously I don't know any of the dimensions so I had to just guess, but now that I have the model I can spin it around and view it from all angles. Unless you're using Autocad LT and don't have access to the 3D modeling tools, there's no need to fool around with isometric drawing. Just my opinion. Quote Link to comment Share on other sites More sharing options...
ReMark Posted March 26, 2018 Share Posted March 26, 2018 9 years later and still no solution:(:( Look at drawing arcs and circles in oblique. A good technical drawing or engineering drawing book should describe the method. Quote Link to comment Share on other sites More sharing options...
SLW210 Posted March 26, 2018 Share Posted March 26, 2018 See THIS and THIS for starters. I still do piping ISOs in 2d, just depends on what's quicker, I have lots of ISO blocks for piping. Something like the OP example is just too easy to draw in 3D and use views. Quote Link to comment Share on other sites More sharing options...
CyberAngel Posted March 26, 2018 Share Posted March 26, 2018 Thanks, SLW. Wish I'd known about ISODRAFT sooner. Last time I needed an isometric curve, I rotated my UCS, drew a circle, and rotated it. Clunky, and you can't do much with the circle when it's in a non-World UCS. Quote Link to comment Share on other sites More sharing options...
lrm Posted March 26, 2018 Share Posted March 26, 2018 Here's some food for thought when thinking about isometric ellipses. You may not want to use this approach as it is labor intensive but I offer it as potential solution. An isometric ellipse has three axes that are of interest (see image below). Major radius (cyan line) Minor radius (green line) Conjugate axis radius (yellow lines) The magnitude of the conjugate axis is the effective radius of the circle that is being viewed at an isometric orientation. For circles that lie on principal planes of an isometric drawing the ratio of the conjugate axis to the minor or major radius is a fixed value as follows: minor radius / conjugate axis = sqrt(2)/2 major radius / conjugate axis = sqrt(3/2) Therefore to create an isometric ellipse that has a conjugate axis of 5 we have: minor radius = sqrt(2)/2 * 5 = 3.5355 major radius = sqrt(3/2) * 5 = 6.1237 Creating an ellipse with these values for the minor and major radii will yield the desire fillet arc of 5. Quote Link to comment Share on other sites More sharing options...
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