You are able to have an electric spice grinder, or purchase a second coffee grinder devoted distinctively to turning whole spices into powder. Or, if you have time and, almost always there is the attempted-and-true mortar and pestle. You are able to grind spices inside a regular blade coffee grinder without tainting it forever.
Similarly, you might ask, do you need a burr grinder for spices?
A normal coffee grinder grinds your beans or spices having a blade. A Burr coffee grinders