如图所示,已知\(∠AOB=60^{\circ}\),\(☉O_{1}\)与\(∠AOB\)的两边都相切,沿\(OO_{1}\)方向做\(☉O_{2}\)与\(∠AOB\)的两边相切,且与\(☉O_{1}\)外切,再作\(☉O_{3}\)与\(∠AOB\)的两边相切,且与\(☉O_{2}\)外切,\(…\),如此作下去,\(☉O_{n}\)与\(∠AOB\)的两边相切,且与\(☉O_{n-1}\)外切,设\(☉O_{n}\)的半径为\(r_{n}\),已知\(r_{1}=1\)则\(r_{2016}=\) ______ .