The orbits, atmospheric parameters, chemical abundances, and ages of
individual stars in the Milky Way provide the most comprehensive illustration
of galaxy formation available. The Tycho-Gaia Astrometric Solution (TGAS) will
deliver astrometric parameters for the largest ever sample of Milky Way stars,
though its full potential cannot be realized without the addition of
complementary spectroscopy. Among existing spectroscopic surveys, the RAdial
Velocity Experiment (RAVE) has the largest overlap with TGAS (≳200,000
stars). We present a data-driven re-analysis of 520,781 RAVE spectra using The
Cannon. For red giants, we build our model using high-fidelity APOGEE stellar
parameters and abundances for stars that overlap with RAVE. For main-sequence
and sub-giant stars, our model uses stellar parameters from the K2/EPIC. We
derive and validate effective temperature Teff, surface gravity
logg, and chemical abundances of up to seven elements (O, Mg, Al, Si, Ca,
Fe, Ni). We report a total of 1,685,851 elemental abundances with a typical
precision of 0.07 dex, a substantial improvement over previous RAVE data
releases. The synthesis of RAVE-on and TGAS is the most powerful data set for
chemo-dynamic analyses of the Milky Way ever produced