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conical hole from radius and apex angle

mark_nahabedian
mark_nahabedian Member Posts: 31 ✭
in Community Support
I want to make a conical hole in a part.

I have a sketch plane perpendicular to the surface that will host the base of the cone.

I'm trying to define a right triangle to revolve to form the cone.

I have a line that defines the radius at the base of the cone.

I have a variable defining the cone's apex angle.

I can use trig to calculate the length of the other leg of the right triangle to form the altitude of the code.

I don't know how to tell OnShape that "the length of this line is the length of that line times the cotangent of the angle in that variable."

Suggestions?

Thanks.

Best Answer

  • eric_pesty
    eric_pesty Member, pcbaevp Posts: 2,822 PRO
    Answer ✓
    I'm confused...
    Does the sketch in the example linked above not achieve what you are trying to do?

    You could do it the "hard" way by using equations either in a variable or in a dimension box but I don't understand why you would need/want to do this... 

Answers

  • eric_pesty
    eric_pesty Member, pcbaevp Posts: 2,822 PRO
    edited March 2023
    Maybe I'm missing something but if you know the base diameter and the apex angle, the simplest would be to just sketch that and use a revolve.
    Seems like you already have the sketch in the right plane too...

    Something like this?
    https://cad.onshape.com/documents/dfb1e7c565bf2c0c95a9f0f4/w/a4fe01b46eae8045848b9e9d/e/2dc9c753bd4bb51a2b9c3683
  • mark_nahabedian
    mark_nahabedian Member Posts: 31 ✭
    I don't know how to tell OnShape the location of the apex.  I know how to calculate it, just not how to communicate that to OnShape.
  • eric_pesty
    eric_pesty Member, pcbaevp Posts: 2,822 PRO
    Answer ✓
    I'm confused...
    Does the sketch in the example linked above not achieve what you are trying to do?

    You could do it the "hard" way by using equations either in a variable or in a dimension box but I don't understand why you would need/want to do this... 
  • mark_nahabedian
    mark_nahabedian Member Posts: 31 ✭
    Got it.  Thanks.  I forgot about angle dimensions.

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