issammm Posted March 18, 2014 Share Posted March 18, 2014 (edited) Hi all any can know how draw third circle between two circle if one tangent point know (fixed) (point A) and other tangent in other circle solve this please: Edited March 18, 2014 by issammm Quote Link to comment Share on other sites More sharing options...
rkent Posted March 18, 2014 Share Posted March 18, 2014 circle, 3point, tan, tan, tan. Start circle command, pick 3p option, type tan, enter, pick small circle, type tan, enter, pick other circle, type tan, enter, pick line. Quote Link to comment Share on other sites More sharing options...
BIGAL Posted March 19, 2014 Share Posted March 19, 2014 Also C TTR same thing Quote Link to comment Share on other sites More sharing options...
rkent Posted March 19, 2014 Share Posted March 19, 2014 Actually I didn't look at the image carefully but now I realize neither solution would work. Quote Link to comment Share on other sites More sharing options...
issammm Posted March 19, 2014 Author Share Posted March 19, 2014 both solution incorrect, if you correct please give me Rx here. I know tan tan tan but where i pick third tan and how can I determine tangent as point !??? Quote Link to comment Share on other sites More sharing options...
eldon Posted March 19, 2014 Share Posted March 19, 2014 It all depends on the order of picking the tan points. I see that I have actually drawn the tangent line to the smaller circle, and that is one of the tan points, as well as the two circles. Quote Link to comment Share on other sites More sharing options...
MSasu Posted March 19, 2014 Share Posted March 19, 2014 Your circle should have a radius of 9.01545790. Will post later the demonstration. To draw it create an offset copy to the left circle with above value. Extend the line that join its center with desired tangent point until intersect the new circle; this is the center of the circle you were looking to draw. Edit: Eldon was faster with his/her graphical solution. Nice one! Quote Link to comment Share on other sites More sharing options...
issammm Posted March 19, 2014 Author Share Posted March 19, 2014 CORRECT, but still can know how you get circle tangents points ?? you look use approximation way not snap point exactly you seek cursor with vertical line and .... can you try for me replace 5.4152 with 5.3923 ?? Quote Link to comment Share on other sites More sharing options...
eldon Posted March 19, 2014 Share Posted March 19, 2014 With the new offset, I make the new radius 9.00001399. Quote Link to comment Share on other sites More sharing options...
issammm Posted March 19, 2014 Author Share Posted March 19, 2014 With the new offset, I make the new radius 9.00001399. you are so closely right but still NOT get the target to answer is 9 try it in your computer and see. maybe because you use 8 precision I suggest you just using 4 or two enough dear. Quote Link to comment Share on other sites More sharing options...
eldon Posted March 19, 2014 Share Posted March 19, 2014 To get a circle of radius 9 exactly, the offset should be 5.39227909 Quote Link to comment Share on other sites More sharing options...
issammm Posted March 19, 2014 Author Share Posted March 19, 2014 yes my autocad just 4 precision. can you give me your way in detail you just make vertical line but how you get the second tangent point ? Quote Link to comment Share on other sites More sharing options...
RobDraw Posted March 19, 2014 Share Posted March 19, 2014 Issammm, your original question was not stated correctly. If you had stated that the radius, Rx, was to be 9 and the offset was the variable, you would have been given a solution that was quite easy. Draw the circle with the TTR option, selecting the two circles and specifying 9 for the radius. Quote Link to comment Share on other sites More sharing options...
issammm Posted March 19, 2014 Author Share Posted March 19, 2014 Issammm, your original question was not stated correctly. If you had stated that the radius, Rx, was to be 9 and the offset was the variable, you would have been given a solution that was quite easy. Draw the circle with the TTR option, selecting the two circles and specifying 9 for the radius. my question is OK, eldon give me correct answers in too accurate. jst eldon give us more precision than needed. the Rx = 9 for case 5.3923 regards to all Quote Link to comment Share on other sites More sharing options...
MSasu Posted March 19, 2014 Share Posted March 19, 2014 Issammm, I gave you above the radius, calculated as per your sketch, with 8 decimals and a solution to use it; isn't that enough for your sketch? Quote Link to comment Share on other sites More sharing options...
RobDraw Posted March 19, 2014 Share Posted March 19, 2014 How can it be when you are changing the value, 5.4152, to a variable and assigning a value where you had a variable, Rx? Quote Link to comment Share on other sites More sharing options...
MSasu Posted March 19, 2014 Share Posted March 19, 2014 both solution incorrect, if you correct please give me Rx here. Seems that you were asked for the radius in the first place! Quote Link to comment Share on other sites More sharing options...
issammm Posted March 19, 2014 Author Share Posted March 19, 2014 Seems that you were asked for the radius in the first place! MSasu you are completely correct.(I hope you explain how you got your answer) Rob i hope you give me correct answer next time all my replay was clear. if you want more challenge draw this and find all arcs length. Quote Link to comment Share on other sites More sharing options...
eldon Posted March 19, 2014 Share Posted March 19, 2014 It seems that there are not enough figured dimensions. For example, where is G? Is it at the end of a semicircle? One could guess, but that might not be sufficiently accurate for you Quote Link to comment Share on other sites More sharing options...
issammm Posted March 19, 2014 Author Share Posted March 19, 2014 It seems that there are not enough figured dimensions. For example, where is G? Is it at the end of a semicircle? One could guess, but that might not be sufficiently accurate for you points B till I are tangents points except A is a vertex, think well you will get it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.