perpendicular from a line

[Nina]

How do I draw perpendicular from a line or object at a specific point? I know by holding shift and osnap perpendicular I can draw the line but I can not osnap to the exact point! help.

[lpseifert]

One way to draw a line perpendicular from a line...

Ortho on

UCS > E (pick line to align UCS)

Draw the line

UCS > P (returns the UCS to previous)

 

You know that using your method of Deferred Perpendicular, you can rt-clk to get osnaps.

[alanjt]

I wrote this for accomplishing that very thing. Mine will allow you to the closest point (based on your selection), closest end point or picked point.

http://www.cadtutor.net/forum/showpost.php?p=305119&postcount=53

 

You'll need a few subroutines (stated in the info), you can find them here..

http://www.cadtutor.net/forum/showthread.php?t=40344

[eldon]

I would just draw the line with Polar tracking enabled. Just make sure that tracking is Relative to last segment, and off you go!

[Nina]

Thanks, i will try it.

[BearDyugin]

Well, while did already have written...

Well as has made that now look:

[alanjt]

Here's an example of how mine works...

 

[Nina]

I copied the lisp program u posted and loaded in cad, the command I used was : "per" but no louck, can u give me easy step by step direction pleeeeease?

 

 

Here's an example of how mine works...

 

[ATTACH]17638[/ATTACH]

[alanjt]

I copied the lisp program u posted and loaded in cad, the command I used was : "per" but no louck, can u give me easy step by step direction pleeeeease?

Make sure you copied everything. You'll have to do a little searching to find all the subroutines (second link).

 

Open Notepad, copy/paste everything in, save as Per.lsp and load into AutoCAD with Appload.

I use it almost everyday, so I can vouch that it works.

[rkmcswain]

Why not just use the PERP object snap?

[alanjt]

Why not just use the PERP object snap?

Because you can't specify a point on the object you are projecting a perpendicular line from. I used to just do that, then move my newly drawn line to where I wanted it on the selected line. Am I incorrect?

[rkmcswain]

Because you can't specify a point on the object you are projecting a perpendicular line from.

 

Maybe I am misunderstanding the problem...?

 

Here is what I am talking about.

 

[Nina]

thank u so much.

 

Make sure you copied everything. You'll have to do a little searching to find all the subroutines (second link).

 

Open Notepad, copy/paste everything in, save as Per.lsp and load into AutoCAD with Appload.

I use it almost everyday, so I can vouch that it works.

[alanjt]

Maybe I am misunderstanding the problem...?

 

Here is what I am talking about.

 

[ATTACH]17654[/ATTACH]

Right, but you can't specify an actual point on the line. That's why I put my PER command together.

[alanjt]

thank u so much.

Am I to assume you got it working?

[rkmcswain]

Right, but you can't specify an actual point on the line. That's why I put my PER command together.

 

So I was misunderstood.... I overlooked the "at a specific point" part of the original request. My bad.

 

Ok, so why not just use polar tracking like this?

 

 

 

BTW: Dynamic input was only enabled so that you could see what I was doing in such a small window. I would never have that turned on while doing real work.

[Nina]

i have to try it tomorrow at work and am sure it will work.

[rkent]

RK, I think that only works if drawing the perp line immediately after drawing the other one.

 

I use UO, short for UCS, Object to align the ucs to the line, draw what I need, then UW, short for UCS, World.

[rkmcswain]

RK, I think that only works if drawing the perp line immediately after drawing the other one.

 

It seems to work at any time.

 

[alanjt]

It seems to work at any time.

 

[ATTACH]17659[/ATTACH]

I stand corrected.