Hello and welcome to Grizzly's video: Drill Press Chuck and Arbor Installation. My name is Kent,
and this is one in a series of how-to videos we are producing,
making it easier for our customers to upgrade and maintain their Grizzly equipment. This is Shaun,
an engineer here at Grizzly, and together we're going to show you how to properly install a
drill chuck and arbor into your drill press. We're using the G7947 17" floor drill press,
but the procedure is the same for the majority of drill presses out there. This video is designed
to give an overview of the installation and help you visualize the process. It should be used in
conjunction with the instructions that came with your drill press. We recommend that you watch this
entire video and that you read your instructions thoroughly before beginning this job. You can also
call our technical support at 570-546-9663 if you need further assistance. But most important
remember to follow all shop safety procedures and remember there are no more important safety
devices than these. Most drill presses have a tapered stub sticking out of the spindle that the
drill chuck attaches to. This is known as a Jacobs taper or JT and is usually sized according to the
drill press. Sizes range from 0 to 6, but are not completely in numerical order. From smallest
to largest it goes: 0, 1, 2 Short, 2, 33, 6, 3, 4, and 5. The four most common sizes are JT 2,
found on our 3/8" baby drill press, JT 33 and JT 6, found on many 1/2 inch drill presses,
and JT 3 which is usually found on 5/8" drill presses. When buying a chuck for your drill press,
all you have to know is the taper of your drill press spindle. Quite often the old
chuck will have a JT number marked on it. Many of the medium and larger capacity drill presses
have an internal taper on the spindle, known as a Morse taper or MT. They are also sized by number,
and range from 1 to 6. MT 2 or 3 is the most common taper found on bench top and floor
model drill press spindles, but industrial drill presses will be often MT 4, or sometimes larger.
The drill chuck is connected by means of an arbor which will usually have a Morse taper on one end
and a Jacobs taper on the other. The shorter Jacobs taper fits into the back of the chuck.
There are some drill presses that have external threads sticking out of the spindle. For this,
you only need to know the thread size, and you can easily match up the chuck. To assemble the
drill chuck and mount it to the spindle, first disconnect the drill press from the power source.
In case you need to remove the check from the drill press, lower the spindle down and drive
the taper drift key into the slot. Gently tap the drift key so that the taper and the key breaks the
bond between the tapers and pushes the chuck out. Be sure and keep a towel on the drill press table,
or hold the chuck so that the chuck does not fall on a hard surface. Use lacquer thinner or acetone
to thoroughly clean the drill chuck, arbor, and spindle sockets, and dry all surfaces before
assembly. Failure to clean the mating surfaces may cause the tapered fit to loosen during operation,
resulting in separation and an unsafe condition. Insert the arbor into the back of the chuck. Using
hand force, make sure that the arbor stays in the chuck. Turn the chuck over with the chuck pointing
up and the arbor pointing down. Gently tap the bottom of the arbor tang onto a hard surface,
like a small piece of plywood laid on top of the bench, or a corner of a bench. This way the
weight of the chuck will mate the arbor tightly onto the chuck. Check the fit by pulling on the
arbor and chuck. If the arbor pulls out, clean both of the mating surfaces with solvent, dry,
and try again. The last step is to seat the chuck and arbor assembly into the spindle.
Adjust the jaws until they retract inside the drill chuck body. Now, slide the arbor into the
spindle socket while slowly rotating the drill chuck to line up the tang on the arbor with the
slotted socket in the spindle. Gently strike the face of the chuck from below with a rubber
faced mallet to seat the arbor into the spindle. Check by gently pulling down on the chuck to make
sure that it's firmly seated in the spindle, and that's it. You're done. Let's go drill some holes!