The Morris taper is held to the drill press by friction only. If you crank the drill press down with your right hand and look at the shaft that extends out if the press, you will see a vertical slot about 3/8" wide and 1-1/4" long cut into it. Now with your left hand turn the chuck slowly and all of a sudden you will see light where the slot goes all the way through the shaft. Part of it will be blocked by the Morris taper and the open hole is where you drive the wedge (or in Toms case a screwdriver.
) and it really doesn't take much effort to pop it out. Just be careful and catch the chuck and not let it drop on the floor (or worse your foot) .
In my case, the drill chick is held to the Morris taper by another taper in the reverse direction however I have seen them held either threads or a heavy screw up through the chuck into the end of the taper piece.
Here is where you may run into trouble....First of all, those are LEFT HANDED THREADS! Don't forget that! Second, they are usually over tightened by the last guy or corroded from time and humidity and even lock-tite and don't want to let go.
For those instances (and this works on hand drills also that are defiantly threaded) use an IMPACT WRENCH to break them loose. An air powered or electric impact wrench is the easiest and quickest method for drill chuck removal in ANY case. You can use one of those hammer powered type of impact screwdrivers also but, they are not as labor friendly.
In the case of a screw up through the chuck, (usually found on reversible drills) select the proper driver (straight, Philips, hex and I've even seen torx style used on some of the newer drills) and chuck it up in the impact driver (of your choice) using a socket that fits the hex end of the bit. Put the impact driver in FORWARD, stick the bit down into the center of the chuck engage the bit into the screw, push down hard and HIT THE TRIGGER! That sucker will jump out so fast you won't believe it!
In the case of the chuck being threaded to the shaft of the drill, Use a 3/8" or larger hex bit in a socket style hex driver and chuck it up to the drill chuck nice and snug, engage the impact driver to the socket and follow the above steps for instant removal of a drill chuck from the drill.
GUANRANTEED!
If that doesn't work, call someone who cares.
Rog