complete with key and two arbors. P/N 1069 is a 1/32"
to 3/8" (9.5 mm) chuck with key and two arbors. A #0
Morse arbor ts the tailstock and a #1 Morse arbor ts
the headstock. The #1 Morse arbor for the headstock is
drilled and tapped for a drawbolt to pull it tightly into the
headstock. The drawbolt is also included.
Use of the Tailstock Chuck
When using the chuck to drill a part in a lathe, you must use
center drills to start the hole. Because of the added rigidity
of a center drill, it will nd and hold the center while a more
exible twist drill will “walk” or follow the part around
rather than center itself. Once a center is established with a
center drill, a twist drill, even if not perfectly aligned, will
center itself in the hole and continue to drill on that center.
(Be sure to use a cutting lubricant when using the center
drill and “clear” the tip often by backing it out of the part
so that the tip doesn’t break off in the hole.)
One additional caution...Do not use the tailstock chuck and
a twist drill to attempt to align the headstock and tailstock.
It is almost impossible to visually nd a center using a drill
point. The utes cut into the drill make the center look
different depending on the angle from which you view it.
For accuracy, use an arbor or “dead center” in the tailstock
when aligning the machine. At very least, use a center drill
in the chuck rather than a twist drill. Keep in mind also that
the runout of this type of chuck can be as much as .003".
The most accurate alignment is achieved using dead centers
in both the headstock and tailstock.
Headstock Drilling
When using the drill in the lathe headstock, the work is
mounted to the table and the drill turns. To allow the work
to be moved up and down, it can be mounted to a vertical
milling table P/N 1185 which is designed to be mounted
to the lathe crosslide. The drill is more commonly used in
the headstock when using it in the milling conguration
either with a mill or on a lathe tted with the vertical milling
column attachment.
FIGURE 3—Headstock drilling—The drill turns while the
work is held stationary.
Installing a Chuck in a taper
Before installing the chuck in either the headstock or
tailstock, make sure the male and female tapers are clean
and free of chips. A drawbolt is used to pull the headstock
chuck tightly into its #1 Morse taper. On the tailstock, insert
the #0 Morse taper into the tailstock and push it until it seats,
twisting it slightly back and forth to make sure you get good
contact with the taper. If it won’t seat fully, it may be hitting
the end of the tailstock leadscrew. Using the handwheel,
extend the spindle ram sufciently so the tapered arbor
can seat. No drawbolt is used on the tailstock. The friction
of the shallow Morse taper should be enough to keep the
chuck from turning when it is properly seated.
Removing a Drill Chuck from its taper
HEADSTOCK—Becausethe forceson thechuck aregreater
when it is used in the headstock, a drawbolt is included
to draw it tightly into the #1 Morse taper to keep it from
slipping. To remove it, back off the drawbolt a few turns
and tap on the head of the bolt with a hammer to free up
the chuck. Start lightly and tap a little harder each time
until the chuck breaks loose.
TAILSTOCK—The tailstock chuck is pushed into the #0
Morse taper in the tailstock with a press t and is easy
to remove. Simply turn the tailstock handwheel counter-
clockwise to bring tailstock ram in past the “zero” point.
The end of the leadscrew inside will contact the back of
the arbor to push the chuck out of the taper.
Joe Martin
President and Owner
Drill Chuck Parts List—All Models
REF. NO. PART NO. DESCRIPTION
1 10190 5/32" Drill chuck body
1 11900 1/4" Drill chuck body
1 11800 3/8" Drill chuck body
2 10170 5/32" chuck arbor, #0J taper to #1M taper
2 11880 Threaded #1M arbor for 1/4" or 3/8" drill chucks
3 30880 1/4-20 x 5" Drawbolt and centering washer
4 10160 5/32" chuck arbor, #0J taper to #0M taper
4 11890 Threaded #0M arbor for 1/4" or 3/8" drill chucks
5 10180 Chuck key, 3/32" drill chuck
5 11806 Chuck key, 1/4" drill chuck
5 11810 Chuck key, 3/8" drill chuck
Drill Chucks, Page 2 of 2 9/18/15
