Made of commonly available pipe fittings.

A brass antenna mount bracket epoxied to the end of the black pipe rigidly holds a variety of brands of rotary tools.  On/off, speed control, spindle lock, and access to motor brushes are unobstructed.

The internal threads of the T-fittings are ground down until the T-fitting can slide up and down on the on the column to position the table height by hand.

Once the desired position is set, the table arm is held in position by a set screw which has been drilled and taped in the back of the T-fitting.

The table is mounted to a 1/2" dowel which is allowed to travel inside the iron pipe.  Wax the dowel completely to allow ease of movement and to prevent absorption of moisture which can cause warping and binding.  A furniture caster (inset photo) with the wheel removed acts as a cam  to raise the table to the drill.  The weight of the metal flange fitting ("table") is sufficient to lower the table by gravity thus no return spring is needed:  The table will lower itself by simply releasing pressure on the handle. 

The base is made of 3/4" x 9" x 9" plywood. Sharp corners are rounded on a stationary disk sander.  The drill table surface is plywood cut to size with a hole saw.  Plywood is used because of it's warp resistant properties and protects the fragile drill bit from over drilling into the metal table.