For Machines Mfg. Since 7/09
EVS Toolroom Lathes
-31-
O P E R A T I O N
Changing Jaws
Item Needed
Qty
Chuck Key ............................................................. 1
White Lithium Grease .......................... As Needed
To change the jaw:
1.
DISCONNECT LATHE FROM POWER!
2.
Place a piece of wood over the ways to
protect them from potential damage.
3.
Insert the chuck key and turn it
counterclockwise to back the jaws out and
remove them.
4.
Clean the jaw mating surfaces and apply
a thin film of white lithium grease to the
mating surfaces.
5.
Set the previously mounted jaws aside in a
safe place free of moisture and abrasives.
6.
Rotate the chuck key clockwise until you
see the tip of the scroll gear lead thread just
begin to enter jaw guide #1 (see
Figure 51
).
— If installed correctly, the jaws converge
together at the center of the chuck.
— If the jaws do not come together, remove
them, then repeat this procedure until
they do.
7.
Insert jaw #1 into jaw guide #1 and hold the
jaw against the scroll gear lead thread.
8.
Rotate the chuck key clockwise one turn to
engage the tip of the scroll gear lead thread
into the jaw. Pull on the jaw—now it should
be locked into the jaw guide.
9.
Repeat
the
Steps 6–8
on the remaining jaws.
Figure 51. Inserting jaw guide #1.
Lead Thread
Mounting Workpiece
Items Needed
Qty
Chuck Key ............................................................. 1
Chuck Cradle or Plywood
3
⁄
4
" (to protect bed) ...... 1
To mount a workpiece in the 3-jaw chuck:
1.
DISCONNECT LATHE FROM POWER!
2.
If the workpiece is large and heavy, place a
chuck cradle or plywood on the bedway below
the chuck to protect it.
3.
Use the chuck key to move the jaws and
mount the workpiece into the chuck (refer to
Figure 52
for typical mounting methods).
4.
Rotate the chuck by hand to make sure the
workpiece makes even contact with all three
jaws and spins evenly without any visible
wobble.
— If the workpiece is not evenly held or is
off-center, repeat
Steps 3–4
.
5.
After verifying that the workpiece is properly
centered, fully tighten the jaws to make sure
the workpiece is held securely, so it will not
come loose during operation.
Figure 52. Typical of 3-jaw chuck mounting methods.
Mounting on an Outside Diameter
Mounting in an Inside Diameter
