I'm trying to draw a rocket nose cone. Notice the red marked at the bottom left of technical drawing. I couldn't figure out what the diameters 26.870 AND 59.732 mean. I drew endless lines vertically to these points and tried to draw circles at these values, but I couldn't make sense of it.Any help? high resolution techincal drawing in this link https://i.imgur.com/b483Iqd.jpeg

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  • $\begingroup$ The original drawing is illegible. Can you post one with a decent resolution? $\endgroup$
    – Transistor
    Commented Aug 3, 2022 at 21:29
  • $\begingroup$ of course i.imgur.com/b483Iqd.jpeg you have to wait a little bit cause of high resolution $\endgroup$
    – Electronx
    Commented Aug 3, 2022 at 21:33
  • $\begingroup$ Please edit your question with the new image. $\endgroup$
    – hazzey
    Commented Aug 4, 2022 at 4:49

1 Answer 1


It can be drawn if the segments are not tangential to each other.

enter image description here

If you want tangential transition, you can define it just between the spherical cap and second segment if the cap is not hemisphere (seems nicer), but the second transition between second and third segment cannot be tangential, so the transition points have to be defined by diameters at distances from the table. enter image description here


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