Subject:
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Re: Tangent between two circles in 3D space?
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 22 Jan 2003 00:34:41 GMT
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Viewed:
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771 times
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In lugnet.cad.dev, Ross Crawford writes:
>
> 1. Find the plane of pulley A
> 2. Find the plane of pulley B
> 3. If they dont intersect, no tangent so stop here
> 4. Find the angle between them, call it T
> 5. Find the normal to plane A that passes through centre of pulley B, call it L
> 6. Call readius of pulley B R
> 7. If sin T = R / L then pulley b is tangent to plane of A so possible
> tangent, otherwise abort
> 8. Do the same, reversing pulley A & B; if both are tangents to the plane of
> the other, then the line of intersection of their planes is the required
> tangent. I think.
>
> I haven't included the math, as I can't remember it, but I'm pretty sure you
> can do all these calculations....
>
> Anyone wanna tear this apart?
Well, I'll start 8?)
Step 6 - thats radius
Step 7 - should be sin T = L / R
ROSCO
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Message is in Reply To:
 | | Re: Tangent between two circles in 3D space?
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| (...) OK. Here's my rather convoluted analysis: 1. Find the plane of pulley A 2. Find the plane of pulley B 3. If they dont intersect, no tangent so stop here 4. Find the angle between them, call it T 5. Find the normal to plane A that passes (...) (22 years ago, 22-Jan-03, to lugnet.cad.dev)
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