They are not really made for that type of operation.
The chuck is too small for the bits you need to do it right, and the motor doesn't have enough torque to move much wood.
They are designed more for grinding type stuff than drilling.
To drill with it, you'd have to basically grind out the hole to get it the right size.
If you can get access to a drill, you'll finish it much better, and alot quicker.