tangent circle and final point

[iron72]

Good evening.
My basic geometry is almost over, but there are still two passages.
practically I have to put tangent the blue circle (r26) on the red adjoining straight but that also passes for the final point, adjacent, of the green straight (51mm from x axis).
while on the other side I have to put the yellow circle(r27) in tangence with the white circle(r7) but which passes from the adjacent final point of the green straight (51mm from axis x).
what is the best strategy to achieve this result. I have already tried but I can't get the desired result.
Thank you in advance.

 

[Ezio Olivato]

This seems to me the game of the three cards, but don't tell me that you can't realize these simple geometric constructions....
see a little if you suggest something this image!!!

 

[Stefano 1950]

hi iron 72,
I was curious about the question you posted and so I wanted to make an attempt.
I don't know if the result you wanted to get was that she allego below.
Good job. stefano.

 

[iron72]

olive ezio
This seems to me the game of the three cards, but don't tell me that you can't realize these simple geometric constructions....
See if it suggests something... .

thanks ezio you gave me a point on how to finish, practically before I created a circle(green r20) around the green line, having same diameter and passing for its center, after with the tritangent circle function I created a circle(r26) tangent on the red straight and on the green circle with r26 radius inputs, while the yellow circle (r27) and tangent for the white circle(r7) and the green circle(r20). :finger:
p.s.: see attachments

stefano 1950
hi iron 72,
I was curious about the question you posted and so I wanted to make an attempt.
I don't know if the result you wanted to get was that she allego. . .

stefano excuse you can post your dwg in the 2007 version of autocad or the previous ones. Thank you.

 

[iron72]

excuse ezio error

 

[iron72]

ok there is I made it, you have to select the circle function in three points, then you have to keep active only the tangency snap and click the red line then you have to activate only the end snap and click the green line on the final point red line and after that give the input radius of 26mm

Nothing to do even this time and managed. I shoot too quickly the results of my work.

 

[iron72]

Ezio please explain to me how you did but write it in words, so I can't understand a great thing.

 

[lattu]

It is much simpler than you think, I'll explain only the first circle, the second is the same thing:
- 26 red line offset down
- circle of 26 with center on the left end of the green line
- the intersection point is the center for your circle

 

[Ezio Olivato]

It is much simpler than you think, I'll explain only the first circle, the second is the same thing:
- 26 red line offset down
- circle of 26 with center on the left end of the green line
- the intersection point is the center for your circle

:finger:bravo lattu, you were even faster;
instead I have generated construction lines starting from the center of the circle, as you see in pdf, moreover!
If you look well at pdf, dear iron72, see that I used your r26 and r27 circles to get the center of the circle respectively tangent at the two points in question. So first I identify the tangency points, secondly with center these identified points generosity of the circles respective of r26 and r27, finally the point of intersection of the new circles identify the center of my desired tangent circle! but these are technical drawing construction techniques, which are made with the compass and paper and pencil. with autocad variants are almost endless, depending on the mastery of the tool you are using.
but what design did you refer to, in asking for explicit explanations?
Hi.

 

[Ezio Olivato]

thanks ezio you gave me a point on how to finish, practically before I created a circle(green r20) around the green line, having same diameter and passing for its center, after with the tritangent circle function I created a circle(r26) tangent on the red straight and on the green circle with r26 radius inputs, while the yellow circle (r27) and tangent for the white circle(r7) and the green circle(r20). :finger:
p.s.: see attachments


I don't understand why you build the green circle. I think it only confuses you.
go to the ends of the green line, build a circle on every extreme of the appropriate diameter.
generates a construction line that starting from the center of the incorrect circles, intersects the red line towards the center of the smaller circle at the top... .

 

[Ezio Olivato]

Look at the attached dwg, and try to do it again. If you don't understand something, we're all here for any explanations. .
It is not as difficult as construction, you just have to find out where are the tangenza points, ehhh!!! then the game comes alone. :smile::smile::smile:

 

[Ezio Olivato]

construction:
1- the segments ab, ac e a'b', a'c'
2- identify points d and d
3- with r26 two circles are generated, or arches up to their intersection with center respectively in b and d
4 is repeated operation 3 with r27 and centers in b' and d'
5-points are identified and is in the intersection of circles or arches.
6- with center in and generates a circle r26; and in is a circle r27.

to clarify the technique used for the benefit of all those who have seen only pdf.

 

[Stefano 1950]

hi iron,
what I had to tell you or show you was widely illustrated by ezio and lattu.
Good job. a greeting to the friends of the forum. stefano.

 

[iron72]

thanks lattu thanks ezio, I finally managed to complete my basic geomtria.

 

[Ezio Olivato]

Please, you're welcome!

 

[Stefano 1950]

hi iron 72,
as a result of your request I attach the file to you in the 2007 version. I wish you a good job. stefano.

 

[iron72]

Okay stefano, it's fine as building as I was prefixed.
Thank you.

 

[Stefano 1950]

Please nothing.
I take the opportunity to give you a hint about the use of the snaps. when you want to make a snap active without other snaps interacting on the job you are performing, you do not need to disable all the snaps that you do not need leaving only the one you choose active. simply hold the "schift" button (cold up) and click the right mouse button; appears a box in which all snaps are listed, selecting one of them will only become active while all others are unactive. I hope I've been clear enough. I wish you a good job. stefano.