7 Replies Latest reply on Aug 6, 2015 10:10 AM by Arnaud Scholten

# changing dimensions and keep the same shape ratio

Hi there,

I would like to know if there is a way to keep the same ratio between 2 dimensions of multiple parts.

As you can see I start bij making a base construction sketch in dimension 1000x2000.

I start with drawing 'a' and dimension 'd'. the other lines of the square touch the base sketch (so it changes later if I adjust the size)

Then I sketch 'c' and dimension 'f', the rest touches the base sketch.

Then I draw 'b' and make collinear relations with  'a' and 'c'

So now if I changes the main dimension of the base sketch from 2000 to 1600 you get the next image.

But 'd' I gave a dimention earlier so this size does not change.

How can I keep the ratio between 'd' and 'e' so it look more the same?

It would be nice if you can say:       'd'  is always 1/4th of dimension e' for example Any clever solutions would be appreciated.

• ###### Re: changing dimensions and keep the same shape ratio

You can relate them via equations in SOLIDWORKS. You can either create global variables and then assign the values to these dimension OR directly apply the equations to the dimensions.

• ###### Re: changing dimensions and keep the same shape ratio

Hi Arnaud,

You can do exactly like you wrote: "It would be nice if you can say:       'd'  is always 1/4th of dimension e' for example" • ###### Re: changing dimensions and keep the same shape ratio

Ok thanks a lot, This is very helpfull.

I will study these Equations and if I have questions about it I will post them here, thanks

• ###### Re: changing dimensions and keep the same shape ratio

Welcome to the forum.  I'm glad you're getting it figured out.  To elaborate a little bit on Sindre's response (and use a little different method), first place dimension E.  Next use the Smart Dimension tool for dimension D, as Sindre's screenshot shows, but after typing the = sign in the text box I'd next click on dimension E, which will automatically enter it into the text box, then enter *.25.  That will insure that dimension D is always 1/4 of dimension E.

• ###### Re: changing dimensions and keep the same shape ratio

Strangely I can not always reach my global variables when I am dimensioning.

I did make global variables  as you can see from the picture.

Does somebody know why I can not see them?

• ###### Re: changing dimensions and keep the same shape ratio

I did see that when I am in a sketch and open equations, I see something different then when I am not in a sketch and open equations?

• ###### Re: changing dimensions and keep the same shape ratio

anyway I want to use equations for the assembly that I can acces with every part.