# Engineering Drawing-Projection of intersection curve of two standing cones

I have this projection of two intersecting cones, and I am asked to draw the intersection curve of the two cones on the projection. What is the right way to do it?

• I would first imagine the shape of the intersect, then locate the points of intersection... – Solar Mike May 28 '19 at 16:15
• That is what I am struggling with- locating the points of intersection. I think that there are specific generating lines of the wider cone that intersect with specific generating lines of the narrower cone. I just can't seem to find those specific intersection points. – Noam Azulay May 28 '19 at 16:19
• Start with the center lines then locate the four extremities on those lines and then continue to draw the dots... – Solar Mike May 28 '19 at 16:21
• I found two intersection points so far- on the top view and the side view- using the two intersection points in the front view(of the center lines). How do I go further with this? – Noam Azulay May 28 '19 at 16:27
• You don't seem to have grasped the basic idea of why projections are useful. Suppose you take a generating line from the top of the large cone. You can draw the same line on all three projections, and each projective view will tell you something about how it intersects the small cone. Piece that information together and you have the point of intersection. (Actually you don't need all three views - two are enough). – alephzero May 28 '19 at 17:20