So when you throw a dagger, surely it becomes a ranged weapon?

— Douglas Blackman (@iamdiggerdoug) February 27, 2018

The act of throwing a melee weapon doesn't transform it into a ranged weapon. Melee and ranged are categories of weapons in the rules. Similarly, whacking someone with a longbow doesn't transform it into a melee weapon. #DnD https://t.co/oITCFcboMv

— Jeremy Crawford (@JeremyECrawford) February 27, 2018

I would think useing a weapon outside of its class would have a – modifier to its damage unless a you can make the dex saving throw and you specialize/racial trait in that specific wpn

— -m (@xMichaelShane) February 27, 2018

Want to make a ranged attack with a melee weapon or a melee attack with a ranged weapon? See the "Improvised Weapons" section (PH, 147) for the rules on doing it. #DnD https://t.co/nhX5nNZWUN

— Jeremy Crawford (@JeremyECrawford) February 27, 2018

I think a DM and an inventive tinkerer can come to some sort of tactical invention esp in a world of magical items, it’s I think a matter of what Damage dice roll (D6?) to place on it. And whether to apply the attack roll? The rules on improvised weapons cover this.

— Jeremy Crawford (@JeremyECrawford) February 27, 2018