Combination of trim, extend, and lengthen 1

[TWong]

I find that I use the trim, extend, and dynamic lengthen commands a lot in my daily routines. 'Trim' is a command that is used by many other cad packages that includes 'extend' and 'lengthen'. Is there a way to combine these three commands so that one button will -
1. Trim a line from an object.
2. Trim a line to an object.
3. And trim a line to an apparent intersection of oject and itself? Any help would be appreciated.

 

[shadow]

to do in that order or to beable to use from one command if everyone helps everybody the world will be a better place

 

[TWong]

To be able to use from one command.

 

[shadow]

and how would u lik eto switch between the commands

like right now i believe in acad 2ki and up trim and extend are 1 command you just press shift depending on which one u started to get the other if everyone helps everybody the world will be a better place

 

[TWong]

Well, I am speaking more in conceptual terms. I don't see a difference between trimming down to a line, up to a line, or to an apparent intersection of lines. In all cases, there ia a target line (cutting line) and the line you want to change (object line). So why are there 3 commands instead of one? And why should you have to switch between commands? Technically they all do the exact same thing, right?

Currently I am running ACAD LT 2k and the trim command will not extend a line to another. I want to enter the command, and chose the target line, then chose the object line, and ACAD should extend if it doesn't intersect, trim if it does, and trim or extend to an apparent intersection if the two lines don't intersect already. This would be a great time saver.

 

[shadow]

you may think that lengthen and extend are similar commands they are but they're not
i'll explain
extend can only extend to something not to a given point
lengthen does what it says if you have a lin 2' long and it needs to be 5' and you dont have an objet to extend to you just lengthen it by telling it you want it 5'

good point about the extend/trim command yes they essintially do the same thing just in opposit directions but if you have 2 horizontal and 2 verticall lines that are parrallel to one another and you need one horizontal to extend to the one nearest to it and the other to the one farthest from it how can you do it in one stroke especially when the end points for the 2 horizontal are between the 2 vertical right then you must do a trim to one and an extend to the other but how is autocad supposed to know when you want to do wich one right tats why the shift to change between commands was implemented

) thats the easiest way i can explain it if everyone helps everybody the world will be a better place

 

[TWong]

Your example of the 2 horizontal and 2 verticals cannot be done in one stroke. This much I can accept. The best thing I can find to do what I want is the chamfer command with a distance setting of 0.

So how about a custom button that does the chamfer command with an automatic setting of 0 distance? That's it! Create a copy of the chamfer command with a distance of 0 and it will trim and extend to each other or to the apparent intersection of each other. Then you could trim the example you gave in one command. I still would not have the full lengthen command but this would be an acceptable alternative.

Thanks! It has helped very much just to talk about it!

 

[shadow]

Granted

macro

^C^C_chamfer;d;0;0;_chamfer

i call it corner cause thats what it does jst like a chamfer so be wary of how you use it if everyone helps everybody the world will be a better place

 

[TWong]

Well, it works but it doesn't work the way I thought it would. It modifies both lines whether you want it to or not. It will not trim a line and leave the cutting line alone. Hmmmm...

I know in trim, we typically chose the cutting line, and then the line we wish to get rid of. What if we could chose the cutting line and then the line we wish to keep? In both instances of trim and extend, you could get the line you wanted trimmed or extended, without modification to the cutting line.

What do you think?

 

[CDH]

The way I would do this is select the line you want to modify, pick the grip on the end you want to extend or trim, and just move it and snap perpendicular to the other line. You dont even need to use a command and you can do all the things you are asking for.

Also, just a tip for people who dont already know. If you want to save a step when your trim or extend, when it asks for the cutting edge, just hit enter w/o picking anything. Now pick the objects to modify and it will automatically find the next line that it crosses.

 

[shadow]

yea but cdh what do you do if the 2 lines dont actually intersect

sorry TWong if that wasnt what you were looking for if everyone helps everybody the world will be a better place

 

[CDH]

You can do the same thing, it will still go perp. to the line. Also if the lines are not at right angle, you can select apparent intersection and it will go there.
You can do a lot of things by using grips, you just have to play with it and find out. I hardly ever use trim because it is just as easy and quick to select the line and drag the endpoint to the intersection.

 

[TWong]

Well, apparently 'apparent intersection' does not work in ACAD LT 2k. Using a vertical line and a horizontal line I can make the grips work using the snap to perp. Now add a line that does not intersect the other two and is at an angle to both of them. Now snap to perp changes the angle of the line and apparent intersection is anything but apparent. I think my company has purchased a blue light ACAD special from Kmart.

I did however learn something new, when you select a line and chose one of the grips, hitting enter will scroll you through stretch, move, rotate, scale and mirror, for the line selected. That was pretty neat.

 

[shadow]

yea TWong i agree apparent intersection is a pain to use when i can get it to work right wish someone had a better way if everyone helps everybody the world will be a better place

 

[CDH]

Hmm, when I have two lines and one of them is not perp to the other, I can still use the grips and instead of picking perp, use the apparent intersection and it goes to the correct point. I am using r14, but I dont think that they would have changed this feature.
Maybe I explained it incorrectly though, because, yes, perpendicular will work if the lines are perp. to each other, but if they aren't it won't work right. Sorry about that.

 

[CDH]

ok. I just figured out how to do exactly what you want.
Ok, you have two lines that dont intersect. You want to trim one line to the other line.
1. start the trim command
2. select cutting edge

3. before selecting object to trim, hit E for edge
There are two variables, extend and no extend.
Set it on extend. Now when you trim it will trim to where you want. This is a system variable and I think it stas on, but dont know for sure.

What this basically does is extend the cutting edge out in each direction so it will pick up everything.

 

[anser]

WHAT I DID WAS THE I PUT TRIM EXTEND AND STRETCH UNDER MY POP 0 IT DOSE NOT PUT IT ALL IN ONE BUT IT DOSE PUT THEM ALL TOGETHER AT THE TOUCH OF MY BIDDLE BUTTON...

 

TWong, why not to use fillet with R set to "0"?