topic Re: autocad constraints in AutoCAD Forum

autocad constraints

Anonymous — Sat, 25 Feb 2017 11:40:28 GMT

Goof afternoon, I want to draw a simple echilateral triangle with geometric center (0,0). How do i constraint it (geometrical and dimensional) so as when i do change the bottom line dimenssion into 100 (which is higher) the triangle will evolve higer simetrically and no change at geometrical point.

If there is an idee in how do i modify dimension to bottom line, i think it is good with dimension like autodesk inventor.

I will wait for an answer.

And thank you for the time.

COSMIN TESNER __>Romania.

Re: autocad constraints

dbroad — Sat, 25 Feb 2017 13:07:40 GMT

The easiest way would be to create a dynamic block and use a scale parameter to adjust the size, using the GCE as the insertion point.

If you must use parametric constraints, add a point on layer defpoints at 0,0, pin it, and then configure the parameters as below.

Re: autocad constraints

Anonymous — Sat, 25 Feb 2017 17:50:56 GMT

It might be easier to use = constraints instead of angles. After all, an equilateral triangle is defined as three equal sides, right?? 🙂

Re: autocad constraints

beyoungjr — Sun, 26 Feb 2017 06:35:27 GMT

Create 3 lines connected in an approximate triangle.
Set the bottom line with a HORIZONTAL horizontal constraint.
Set an ANGULAR constrain for the upper two lines.
Give the upper two lines an EQUAL constraint.
Give the bottom line a LINEAR constraint.

Double click the ANGULAR and Linear Constaints to set 60 degrees and any length you wish.

Here is your solution...