Instructions

WEAR YOUR
FORESIGHT IS BETTER
THAN NO SIGHT
READ INSTRUCTIONS
BEFORE OPERATING
SAFETY GLASSES
SHERLINE PRODUCTS INC. • 3235 Executive Ridge • Vista • California 92081-8527 • FAX: [phone]
Toll Free Order Line: [phone] • International/Local/Tech. Assistance: [phone] • Internet: www.sherline.com
7/19/18
0.002" to 0.003" runout. If perfect accuracy is desired in a
particular operation, the use of a 4-jaw chuck or a collet is
recommended. Both are available for your Sherline Lathe.
NOTE: DO NOT TURN THE LATHE SPINDLE ON
UNTIL THE CHUCK IS TIGHTENED. The acceleration
of the spindle can cause the scroll to open the chuck jaws
if not tightened!
To prevent permanent damage, only nished, turned or
drawn stock should be held with this chuck. For rough
castings, etc., use the 4-jaw chuck.
DO NOT OVERTIGHTEN THE CHUCK. Use only
moderate pressure with the supplied Tommy Bars.
Reversing the Jaws
Jaw Locations
REVERSE POSITION
Jaw Number
Insertion Order
1st
1st
2nd 3rd
3rd
3 2 1
A
B
C
Rotate knurled ring
this direction to
engage jaws
Jaw 3 Jaw 1
Jaw 2
2nd
FIGURE 2—Reversing the Chuck Jaws. NOTE: Always start
with position “A.”
To reverse the chuck jaws, rotate the knurled scroll until
the jaws can be removed. They can be easily identied by
the location of the teeth to the end of the jaw (See Figures
1 and 2). To maintain chuck accuracy, the second jaw must
always be inserted in the same slot even when the jaws are
reversed. This slot is identied by a punch mark or the letter
“B” next to the slot. Always insert the jaws in the order and
location shown on the drawings. Turn the scroll counter-
clockwise when viewed from the face of the chuck until
the outside start of the scroll thread is just ready to pass the
slot for the rst jaw. Slide the rst jaw as far as possible
into the slot. Turn the scroll until the rst jaw is engaged.
Due to the close tolerances between the slot and jaw, the
most difcult part of replacing the jaws is engaging the scroll
Three-jaw chucks are designed so that all three jaws move
together and automatically center round or hexagonal parts
or stock to within a few thousandths of an inch. These
chucks provide the quickest and easiest way of holding
work in the lathe. To open or close the chuck, turn the
outer ring with one hand while holding the knurled inner
ring in your other hand. Use the tommy bars in the holes
provided in each ring to apply more leverage to tighten or
loosen the chuck.
Jaw Opening Ranges
These chucks are designed so that the jaws can be removed
and reversed to hold larger stock. They can also be used to
clamp externally on bar stock or internally on tube stock.
The 2.5" 3-Jaw Chuck (P/N 1041)
Jaws in normal position: 3/32" (2mm) to 1-3/16" (30 mm)
Jaws in reverse position: 1/4" (6mm) to 2-1/4" (56 mm)
3.125" 3-Jaw Chucks (P/N 1040, 1040C, and 1042)
Jaws in normal position: 3/32" (2mm) - 1-1/2" (38mm)
Jaws in reverse position: 1/4" (6mm) - 2-3/4" (70mm)
Sherline chucks have a .687" (17 mm) through hole with
a 3/4"-16 thread for use on standard Sherline headstock
spindles. (P/N 1042 has a 22 x1.5 mm thread for use on
ER-16 collet spindles).
Due to the nature of the design of a 3-jaw chuck, it cannot
be expected to run perfectly true. Even 3-jaw chucks costing
ve times more than the one made for this lathe will have a
3-Jaw Chucks
P/N 1040, 1040C, 1042 (3.125") and P/N 1041 (2.5")
NOTE: The P/N 1042 chuck is
threaded 22 x 1.5 mm for use on
ER-16 collet spindles.
CAUTION
These chucks are not intended for
use at speeds above 3000 RPM.
Jaw Locations
NORMAL POSITION
Jaw Number
Insertion Order
1st
1st
2nd
2nd
3rd
3rd
1 2 3
B
Rotate knurled ring
this direction to
engage jaws
Jaw 1 Jaw 3
Jaw 2
A
C
FIGURE 1—Three-Jaw Chuck, standard jaw locations.