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How change length of Polyline segment to an exact value?

SVanDee — Thu, 26 Dec 2019 14:18:16 GMT

Just learning AutoCAD. I don’t understand how to change the length of a Polyline segment to an exact value. The attached file illustrates. I can do it with PEDIT but it takes a long sequence of steps. Isn’t there a way of doing it directly?

(I'm running AutoCAD LT 2020 on a Mac but I thought this probably works the same in all editions to I'm posting to the AutoCAD forum. If that's not so, please tell me which forum to move this to. Thanks.)

Re: How change length of Polyline segment to an exact value?

pendean — Thu, 26 Dec 2019 14:20:50 GMT

MAC forum is over here https://forums.autodesk.com/t5/autocad-for-mac/ct-p/4051

LT versions of AutoCAD fofer no automation, so your long method is most likely all you can do there. If it has it, look up LENGTHEN command in HELP as another tool.

Re: How change length of Polyline segment to an exact value?

Alfred.NESWADBA — Thu, 26 Dec 2019 15:54:04 GMT

Hi,

>> how to change the length of a Polyline segment to an exact value

When you use dynamic input on, just select the polyline, then click on the second vertex of this segment to use the grip for stretching ... this gives you the option to enter a value for the length (at least in AutoCAD for Windows it works this way):

- alfred -

Re: How change length of Polyline segment to an exact value?

SVanDee — Thu, 26 Dec 2019 21:15:43 GMT

Works great. Be embarrassed to tell you how much time I've spent on this without realizing it's important to select the vertex at the end of the segment rather than at the beginning. Thanks for your help.

Re: How change length of Polyline segment to an exact value?

SVanDee — Mon, 30 Dec 2019 18:02:23 GMT

To round out this discussion, selecting the vertex and entering a length always changes the length of the segment that was drawn into that vertex. That is, you can only change the length by moving one end of the segment. The “from” osnap lets you do it by moving either end. Like this:

Select the polyline to enable the grips.

Click the vertex at the end of the segment you want to move which starts a Stretch command.

For “Specify stretch point or [Base point/Copy/Undo/eXit]:” , enter “from”

For “Base point:”, Click the vertex at the other end of the segment

For “Base point: <Offset>: “, enter “ext”

For “of”, hover close to the segment you want to change until an “Extension” dynamic input appears.

Without clicking the segment, just type the length you want the segment to be and enter <return>.

That will change the length and terminate the command.

The “from” osnap actually lets you move any object or vertex to a precise offset from any other location. Thanks to “MbMinx” in another post for prompting to learn about it.