The following steps show how to create conical gradients by using envelopes.
Repeat scaling each single mesh point until all direction lines completely scarper.
Now take this mesh object and add it to any Symbol library, so that you can use it as a conical grad maker in future sessions where you just draw a rectangle, fill it with a linear gradient, place the symbol on top of the rectangle and execute the Object > Envelope Distort > Make with Top Object command.
Illustrator 10 and above