topic Re: Insert line parallel to other that snaps to tangent of arc nearby in AutoCAD Forum

Insert line parallel to other that snaps to tangent of arc nearby

LGL_Design — Tue, 19 Aug 2025 11:33:57 GMT

I hope someone can help me.

I need to insert a line that is parallel to AB.

But snaps to the tangent an arc nearby.

Dotted line is just positioned by hand, that that is what I essential want.

Thanks in advance

Re: Insert line parallel to other that snaps to tangent of arc nearby

paullimapa — Tue, 19 Aug 2025 11:58:07 GMT

Have you tried using Copy command Line AB with base point by object snapping to endpoint of Line at B and the 2nd point as object snap Tangent to Arc then Trim section of Line at A that’s not needed?

Re: Insert line parallel to other that snaps to tangent of arc nearby

imadHabash — Tue, 19 Aug 2025 12:03:53 GMT

Hi,

The fastest way is to use from Parametric ( GCTANGENT command ) .. Click on below image

Then you can delete the constraint by DelConstraint command from the same previous menu

Re: Insert line parallel to other that snaps to tangent of arc nearby

leeminardi — Tue, 19 Aug 2025 12:12:47 GMT

Using perpendicular object snap create a line from the center of the arc to line AB. Now copy the line AB from B to the intersection of the perpendicular line and the arc.

Re: Insert line parallel to other that snaps to tangent of arc nearby

LGL_Design — Tue, 19 Aug 2025 12:14:59 GMT

If I understand you correctly, then it results in this:

Re: Insert line parallel to other that snaps to tangent of arc nearby

LGL_Design — Tue, 19 Aug 2025 12:22:42 GMT

This is 100% what I want to achieve, but I am using AutoCAD LT, it doesn't seem to have full access to parametric constraints as shown in the video / image above.

Re: Insert line parallel to other that snaps to tangent of arc nearby

LGL_Design — Tue, 19 Aug 2025 12:24:47 GMT

This worked, perfect, thank you.

Re: Insert line parallel to other that snaps to tangent of arc nearby

imadHabash — Tue, 19 Aug 2025 12:28:27 GMT

You're right ... 😉

In AutoCAD LT, parametric drawing technology is limited , While it is not possible to create or edit geometric and dimensional constraints in AutoCAD LT, you can still view, work with, and save constrained drawings.

Re: Insert line parallel to other that snaps to tangent of arc nearby

LGL_Design — Tue, 19 Aug 2025 12:35:29 GMT

Thanks for the info.

I suppose the onus is on us (LT users) to find creative work arounds, and share with the community.

Re: Insert line parallel to other that snaps to tangent of arc nearby

leeminardi — Tue, 19 Aug 2025 12:37:49 GMT

@LGL_Design You are welcome. It looks like in your first try the the perpedicular line was not from the center. Here's what I got.

Re: Insert line parallel to other that snaps to tangent of arc nearby

-didier- — Tue, 19 Aug 2025 12:43:13 GMT

Bonjour @LGL_Design

Your line is secant, not tangent.

Here is my proposition :

Amicalement

(view in My Videos)

Re: Insert line parallel to other that snaps to tangent of arc nearby

LGL_Design — Tue, 19 Aug 2025 12:47:26 GMT

In my first attempt I was replying to someone else.

Your method work perfectly, thanks.

Re: Insert line parallel to other that snaps to tangent of arc nearby

LGL_Design — Tue, 19 Aug 2025 12:51:17 GMT

perfect thanks.