I am trying to sketch an involute curve for centrifugal pump casing. Can you please guide me how to sketch an involute in sketch mode.
I don't believe you can accurately sketch an involute curve; however, you can define it exactly using an equation-driven curve.
The best way to get an involute curve into a sketch is to project it from an external-to-the-sketch feature.
The reference can come from an equation driven edge or curve such as the result of a variable sweep or maybe a equation driven datum curve.
There is a similar problem with making graphs. Using algebraic functions have to come from external sources, not always parametric either. Graphs are great for making variable sweep sections using the evalgraph() function.