Draw a circle tangential to 3 given circles

[Guest Alan Cullen]

Does anyone know how to do this.....or does anyone have a lisp routine for this ?????

 

I just got hold of the formula for it, and just went WOW......I'm not even going to start to understand that....let alone write a routine for it.

[SEANT]

I assume you mean something other than:

 

^C^C_circle _3p _tan \_tan \_tan \

 

An automated routine would no doubt need some user interaction to cull out the numerous circles that aren't needed.

 

In any event, I would like to see that formula.

[Guest Alan Cullen]

G'day SEANT,

 

Go here.......

 

http://www.arcenciel.co.uk/geometry/index.htm

 

then go to CIRCLE GEOMETRY -> CONSTRUCTION -> Circles tangential to 3 circles -> circle3C.pdf.

 

 

EDIT.....

Now I really feel so embarrassed .....I just tried your suggestion, SEANT, ^C^C_circle _3p _tan \_tan \_tan \ .......and it worked like a charm. I've never tried that one before. Thanks very much.

[SEANT]

http://www.arcenciel.co.uk/geometry/index.htm

 

then go to CIRCLE GEOMETRY -> CONSTRUCTION -> Circles tangential to 3 circles -> circle3C.pdf.

 

 

Now that's what I call a Proof.

 

It's fortunate Autocad has an proccess available to avoid wrestling with all that math.

[BIGAL]

Hey great routine anybody got an answer for two arcs to be joined by a 3rd arc the fillet command draws a S bend nearly evey time (u^u 3 arcs)

[Guest Alan Cullen]

G'day BIGAL.....

 

Chuck up a visual on what you are after......there are a number of solutions to that problem.....

 

I would have thought you already had an answer for that problem....

[khoshravan]

I assume you mean something other than:

 

^C^C_circle _3p _tan \_tan \_tan \

 

An automated routine would no doubt need some user interaction to cull out the numerous circles that aren't needed.

 

In any event, I would like to see that formula.

 

 

What is the meaning of ^C^C in ^C^C_circle _3p _tan \_tan \_tan \

and how can I use this phrase. Is inputting in command line enough? Apparently it could not be used in command line and should used in other way.

[Jack_O'neill]

The ^c^c is Autocad-speak for cancel. This bit of the code is equivalent to hitting the escape key twice. You can use this for toolbar macros. It makes sure the previous command had ended before beginning another.

[khoshravan]

The ^c^c is Autocad-speak for cancel. This bit of the code is equivalent to hitting the escape key twice. You can use this for toolbar macros. It makes sure the previous command had ended before beginning another.

 

Thanks a lot. btw the solution for this problem

_circle _3p _tan \_tan \_tan \

is very nice. Otherwise it would takes hours to establish a solution.