AutoCAD 2010/2011/2012

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kansoms
Posts: 2
Registered: ‎12-12-2012
Message 1 of 5 (483 Views)

How to find the tangent point of 2 circles?

483 Views, 4 Replies
12-12-2012 12:38 PM

I want to find the tangent intersection point between 2 circles within certain conditions.

Circle 1 is r: 30 m and is fixed.

Circle 2 is r: 20 m and its position is inside circle 1.

Circle 2 can be moved in a given angle.

The question is: what distance should circle 2 move, to become tangent with circle 1.

*Expert Elite*
hmsilva
Posts: 2,668
Registered: ‎12-17-2004
Message 2 of 5 (468 Views)

Re: How to find the tangent point of 2 circles?

12-12-2012 01:28 PM in reply to: kansoms

kansoms wrote:

...The question is: what distance should circle 2 move, to become tangent with circle 1.

 

Programmatically or drawing?

 

Henrique

*Expert Elite*
Alfred.NESWADBA
Posts: 8,890
Registered: ‎06-29-2007
Message 3 of 5 (453 Views)

Re: How to find the tangent point of 2 circles?

12-12-2012 02:33 PM in reply to: kansoms

Hi,

 

you can solve that with constraints, look here:

20121212_CalcGeomParametrics_AN01.gif

 

And a drawing is attached also.

 

- alfred -

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Alfred NESWADBA
Ingenieur Studio HOLLAUS ... www.hollaus.at
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*Expert Elite*
hmsilva
Posts: 2,668
Registered: ‎12-17-2004
Message 4 of 5 (448 Views)

Re: How to find the tangent point of 2 circles?

12-12-2012 02:41 PM in reply to: kansoms

kansoms,
if it is drawing,
all you need is to do an offset of outer circle with de distance of the radius of the inner circle the
point of intersection between the further circle and the vector of displacement is the center point of
the tangent circle.

 

circlesr.PNG

 

hope that helps

 

Henrique

New Member
kansoms
Posts: 2
Registered: ‎12-12-2012
Message 5 of 5 (419 Views)

Re: How to find the tangent point of 2 circles?

12-13-2012 11:03 AM in reply to: kansoms

This is wat I was looking for. Why dydn't I think of it???

 

Thank you very much!

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