As the post name suggested, here we will discuss on ways you can link two or more dimensions. The basic idea is make dimensions depend on each other and helps in quick updation of the dimension value.
The two ways via which dimensions can be linked are:
- Using Equations
- Shared/Link Values
Both the methods can be used in parts as well as assemblies.
When dimensions are linked in this way, one member of the group is a driving dimension and second or others are driven dimension(s). Changing the value of driving dimension will change all others driven dimensions as per the equation has been set.
I have used a very basic sketch (rectangle) to explain the methods of using equations and link values.
How to use equations to link two dimensions:
- Start a new part and start a sketch on any of the plane. Draw a rectangle with any size.
- Start dimensioning and give dimension of any one of the side.
- Dimension the other side but don’t click on OK.
- Click on arrow next to dimension and from the list select “Add equation.”
- You’ll see a add equation window pop up with the current dimension there (“D2@Sketch1” in this case) with = sign.
- Now select the dimension already created in step 2 above and you’ll see that is added after = sign in the add equation window (“D1@Sketch1” in this case).
- Now the equation is “D2@Sketch1” = “D1@Sketch1” which means the value of “D2@Sketch1” will be same as of “D1@Sketch1” (1.000” in this case)
- Now say I want “D2@Sketch1” to be half of “D1@Sketch1”. Simply add /2 at the end of the equation. Now the equation will look like “D2@Sketch1″ = “D1@Sketch1″/2.
- Click OK to come out of equation editor and you can see the equation listed in the equation window.
- Click OK to come out of equation window. You can notice the equation symbol in front of the dimension indicating that this is a driven dimension.
- Change the driving dimension value and see the change in the driven dimension value.
This was really a very example of using/creating equations. You can try lot of other settings, values, etc. in equations. And similarly you can create many equations.