topic Re: How to scale in one direction (non uniform scale)? in AutoCAD Forum

How to scale in one direction (non uniform scale)?

rafal_jarominiak — Tue, 26 Nov 2024 10:27:50 GMT

I searched for an answer but I only found one about scaling a block. Which in my case is not very precise. I need to scale an object only in one axis - x. It would be best if I could grab a point and snap it to a line. I have shown this in the picture. My cross-section needs to be scaled and fit between the gray lines. The effect is shown by the arrow.

Re: How to scale in one direction (non uniform scale)?

jayhar — Tue, 26 Nov 2024 10:33:13 GMT

Hello,

Using Stretch as an Alternative,

If the object is a simple cross-section, the Stretch command might be another option

Re: How to scale in one direction (non uniform scale)?

RSomppi — Tue, 26 Nov 2024 11:30:06 GMT

You were on the right track with scaling blocks. They can be scaled in one direction. Make the objects into a block and use scale/reference to adjust the block.

(Stretch will not work correctly with that geometry.)

Re: How to scale in one direction (non uniform scale)?

rafal_jarominiak — Tue, 26 Nov 2024 11:41:38 GMT

Maybe I'm doing something wrong. It's still scaling as always. Can you describe the steps exactly? thx

Re: How to scale in one direction (non uniform scale)?

RSomppi — Tue, 26 Nov 2024 11:48:44 GMT

There is more than one way to do it. The scale command has options or you can use the properties box. Blocks have a setting to allow non-uniform scaling. You may need to check that also.

Re: How to scale in one direction (non uniform scale)?

pendean — Tue, 26 Nov 2024 13:51:30 GMT

@rafal_jarominiak wrote:
Maybe I'm doing something wrong. It's still scaling as always. Can you describe the steps exactly? thx

PROPERTIES, and your object needs to be a block (nothing else)

Re: How to scale in one direction (non uniform scale)?

tramber — Tue, 26 Nov 2024 14:01:34 GMT

There is no need to create a block as long as you can copy and then paste (any type of copying or pasting).

Enter X + ENTER and you will be able to specify among your needs without interfering with Y or Z.

😉

OUPS : edit : you still need to paste as a block ! I checked and it doesn't work that well if not.... Still more interactive 😎

Re: How to scale in one direction (non uniform scale)?

rafal_jarominiak — Tue, 26 Nov 2024 14:03:35 GMT

This is a partial solution. If I want to fit between two lines, I need to know the exact scale. Snapping would be better, but I don't know if there is such a thing. thx

Re: How to scale in one direction (non uniform scale)?

RSomppi — Tue, 26 Nov 2024 14:11:17 GMT

The math is easy.

Alternatively, you could use the reference option in the scale command and you could use snaps.

Re: How to scale in one direction (non uniform scale)?

pendean — Tue, 26 Nov 2024 14:14:11 GMT

@rafal_jarominiak wrote:
This is a partial solution. If I want to fit between two lines, I need to know the exact scale. Snapping would be better, but I don't know if there is such a thing. thx

That's what ALIGN command is for, give it a try.

Re: How to scale in one direction (non uniform scale)?

leeminardi — Tue, 26 Nov 2024 14:25:50 GMT

Creating a block and setting an appropriate scale factor in x may be the best route.

Thinking outside the box you could also use rotate3d!

Calculate the rotation angle = acos( x scale factor). Using rotate3d and rotate the geometry about the y axis by the cacluated angle followed by flatten. This assumes that the orginal geometry s n the XY plane.

Re: How to scale in one direction (non uniform scale)?

Kent1Cooper — Tue, 26 Nov 2024 15:32:27 GMT

@rafal_jarominiak wrote:
This is a partial solution. If I want to fit between two lines, I need to know the exact scale. Snapping would be better, but I don't know if there is such a thing.

If I understand correctly, with a Block, use SCALE with the Reference option, which should be workable with Osnapping [though it may be affected by where your Scaling base point is, and/or where the Block's insertion point is], then set one of the scale factors back to 1 [or whatever else it was when you started] in the Properties palette.

Re: How to scale in one direction (non uniform scale)?

rafal_jarominiak — Wed, 27 Nov 2024 12:42:17 GMT

Yes, that solves the problem 🙂 Although it would be nice to have an option for this in SCALE without creating a block. Thanks Kent1Cooper.

Re: How to scale in one direction (non uniform scale)?

RSomppi — Wed, 27 Nov 2024 12:47:13 GMT

You're welcome.

Re: How to scale in one direction (non uniform scale)?

GO52SEK — Thu, 26 Dec 2024 21:08:11 GMT

HOW ABOUT FOR THE CURVE,I WOULD LIKE TO SCALE MY CURVE IN ONLY X-AXIS

Re: How to scale in one direction (non uniform scale)?

Kent1Cooper — Fri, 27 Dec 2024 13:38:54 GMT

@GO52SEK wrote:

HOW ABOUT FOR THE CURVE,I WOULD LIKE TO SCALE MY CURVE IN ONLY X-AXIS

The procedure I described in Message 12 will do that. [It will change an Arc or Circle to a partial or complete Ellipse, etc., but that's unavoidable in the geometrical nature of scaling in only one direction.] If it does not work as you want, can you illustrate what you want with an image or sample drawing, even if you need to make it approximate? Show before and after, what you get with the procedure I described and how you want the result to be different.