How to make a plane on the sloping side of a cone?

[kdeuler]

Hi all. In the image below, you can see how I've "drilled" a small hole in this section of a cone. It is as if I drilled straight down from the top. What's not clear to me is how I'd go about drilling a hole that is perpendicular to the slope of the cone (drilling in from a angle). It seems like what I'd have to do is:

1. Create a line from a point on the outside of the top circle, to the nearest point on the outside of the large circle.
2. Create a plane through that line that's tangent to the side of the cone.
3. Draw a circle on that plane whose center is coincident with the line.
4. Do a cut-extrude into the face of the cone.

If the above is the correct procedure, how would you do this? In particular, how would you do the italicized bits of steps 1 and 2?

If there's another way, please so advise.

Thanks in advance. (FYI, if it helps, the drawing is here.)

[JDMather]

Here are two techniques, no doubt there are more.

[kdeuler · Accepted solution]

Hmmm! Thanks JD. These work.

Supposing for sake of discussion that you wanted to drill several perpendicular holes at random places. Would you first have to construct several planes that  go through the Z axis, and random degrees around the Z?

[Anonymous]

hi mikec here i am new to 360  learning everything pretty easy  only thing is a cone my model has round legs that have to tapered

could you help me  looked all through the help files no luck

thanks mikec

[HughesTooling]

You can use the hole tool just select the face of the cone. You don't have much control for position though.

Mark

[Anonymous]

it made a taper on the inside  i need it on the outside

thanks mikec

[JDMather]

Attach your *.f3d file here and end all doubt.

[Anonymous]

thatfile don't know what it is  i just have drawing of a cylinder

sorry i am new to this  i built my own cnc machine now i need to learn cad/cam

thanks mikec