I have been working with SW for some 5 years and I have went through calculus in college, I am trying to get ready for the CSAP exam. I have went the essentials manual, I worked all the equations in the manual, and It does not make much sense to me and it doesn't give a good explaintion for what I and doing, can any one give me some insight or were to go for some help?

Thanks

There are other ways to do that using geometry dimensions and/or Design Tables, but as a simple example;

Assume the largest dia is renamed to

Main OD, the next dia to the right is renamedDia 1, the nextDia 2, then;"Dia 1@Sketch1"="Main OD@Sketch1"-30

"Dia 2@Sketch1"="Dia 1@Sketch1"-10

Then by changing the largest dia in the model, the other dia's will update accordingly.

Equations, like Desgn Tables, can be very powerful.