How do I get to the Ming Tombs from Badaling?

Yes, you can make it in one day. Just go to Badaling a little earlier that morning. You can take bus no.919 branch line or slow line at Badaling bus station (back mountain) to the south gate of Ming Palace of Wax, walk to Changping Xiguan bus station and take bus no. 314 to Nanxin Village, then walk about 120 meters to the Ming Tombs.