You will need
- - base diameter
- - the height of the cone
Build X and Y axis at an angle of 120°. Vertically upward from their intersection guide axis Z.
Build on the axes of the rhombus whose side is equal to the base diameter of the cone.
Fill in the auxiliary rhombus oval.
Aside from the center of the ellipse the height of the cone parallel to the axis Z.
Swipe from the top of the cone tangent to the ellipse at the base.
Determine the visibility of lines in the drawing. Visible lines are solid, invisible, dotted line, axial - dash-dotted line.
If you need to build a cone you have to build another subsidiary rhombus on the height of cut and re-enter it in the oval. This is true for the cone, cut by a plane parallel to the base of the cone. If the cut plane is positioned at an angle, then the build will be different.
Auxiliary building complete solid pencil, so they will be less noticeable. Visible lines are constructed of a cone circle with a soft pencil.
Advice 2 : How to build a slanted section
Often the students of the senior classes and students are faced with the question how to build a sloping section. The correct wording of the question is as follows – how to build a life-size oblique sections of the object (shape or details). And the section is called front-projecting section plane.
You will need
- - a sheet of paper;
- - the range.
Draw the object in the three main planes, the main, top and sides. On the main guide shape sloping line that shows how is a front-projecting plane. Note on a straight all the main points of entry and exit section. For example, if the rectangle is one point of entry and one exit, if the prism is four dots: two dots is the entry into the figure and the exit, the two remaining sides of the prism.
A parallel line to the section plane, the distance may be arbitrary. From the resulting point on the axis of the main guide perpendicular to the auxiliary straight to the intersection with the parallel axis. Do you get the projection of the points of the shape in the new coordinate system.
Define the width of the projected shape. Note on the top view projection of each primary point. For this point, located on the main form, drop a line. Each re- section shape and the straight note. For example, A is the point on the main view, then A’ and A” is the corresponding projection. The distance between the vertical projections of these points put in the new coordinate system. The resulting figure is the actual size of the inclined section.
If you got a round figure, together with the main points, select a few intermediate points. Distance choose between them the same. In the end, the figure of the natural cross section will be an ellipse.
The each projection of the coordinate system to number under his number. For example, the main view is a projection in the system P, then the top view projection of the system P1, a side view in the system P2, and so on. This will facilitate the task numbering of the projections of the points.