Why does my car make weird sound when i try to crank it

Most of the used mechanical part of a vehicle make sound!! but when the sound are weird, your car may have a damage in the crankshaft metal, or on the flywhell, some teeth are bad,
If the sound is at the beginning of the crank are the flywhell or the starter motor teeth.
But if the sound is at the runing time are the crankshaft metals...
some little pieces around the supports of the crankshaft
Hurry up to service, the engine need fixed in both cases, flywhell or crankshaft are vitaly to operate.