Hello TundraMike,

The chuck on the DW100 is a 3/8" capacity and most 3/8 chucks mount on a 3/8-24 spindle. If you can find a 1/2" chuck with that size of mount it would work. Just be careful with what you chuck up in it, the gears and motor are rated for a 3/8.

Hope that helps,
-WJA