Well, the 20-50 micron press gives me a safety factor of 35 for static loading, my concern is more the impact loading and doing analyzing dynamic loading effects on the interface. We currently have no plans to key or pin the interface.
The gear will have a ID through which the pinion will be pressed into. The press interface will not have any gear teeth and we are looking into a 20-50 micron intereference on a 14mm diameter.
They are both spur gears.