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tangent to two splines

jdfnnl
Advocate

tangent to two splines

jdfnnl
Advocate
Advocate

Is there a command or method of drawing a line tangent to two splines?

 

2023-12-27 22_18_20-Autodesk AutoCAD 2015 - [friends [fin].dwg].png

 

As with circles -->

 

2023-12-27 22_21_28-Autodesk AutoCAD 2015 - [friends [fin].dwg].png

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4 Respuestas
Respuestas (4)

Valentin-WSP
Mentor
Mentor

@jdfnnl ,

 

You will need a special APP or LISP to be precise, but this should get you fairly close.

 

Draw a line NEAREST (A) to TANGENT (B) - (Red Line).

Then draw a line from the ENDPOINT (B) to TANGENT (A) - (Green Line).

You may want to draw a final line from ENDPOINT (A) to TANGENT (B) - for precision and use this line.

 

ValentinWSP_0-1703758695816.png

ValentinWSP_1-1703758748978.png

ValentinWSP_2-1703758808707.png

ValentinWSP_3-1703758870945.png

 

ValentinWSP_4-1703759211772.png

 

 

 



Please select the "Accept as Solution" button if my post solves your issue or answers your question.


Emilio Valentin

ВeekeeCZ
Consultant
Consultant

I would use FLATTEN to convert them into plines, then do tangents...

TheCADnoob
Mentor
Mentor

I agree with others that an app or converting to plines may be better, but I have used something similar to below method before. 

 

Approximate the circle of the curve using circle with 3 point. Do this for both curves. Then do a tangent to those circles. There will need to be clean up after to make sure you have got it on the actual spline but for my purposes this worked well for me. 

 

CADnoob tangent to two splines.gif

CADnoob

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leeminardi
Mentor
Mentor

I vote for the method presented by @Valentin-WSP.  One advantage is that you maintain the splnes.  After 4 or 5  interations going from A to B, then B to A, etc. you will have a very accurate solution.  It is the approach I would use in a LISP program if there was a need to create tanget lines to splines frequently. 

lee.minardi