I would HIGHLY recommend that you either take it as a carry on, or take it to a UPS or FedEx place, and ship it in a box with alot of padding.... I can gaurentee you 100% that if you put it in carry on, you will get a damaged platter....
If you don't want to put it in the x-ray machine, you can request that it be inspected by hand, but be warned that they will want you to likely show then that it works.... actually, you might need to show them that it works either way.