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The three-jaw scroll chuck has removable hardened steel
jaws (=`^li\0). The outside of the jaws are used to hold
the workpiece from the outer diameter.
Numbered from 1–3, the jaws must be used in the match-
ing numbered jaw guides (see =`^li\ (').
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(% DISCONNECT POWER TO THE LATHE!
). Place a piece of wood over the ways to protect them
from potential damage.
*. Turn the chuck key counterclockwise and back the
jaws out.
+. Clean the jaw mating surfaces and apply a film of
white lithium grease to the mating surfaces.
,. Set the old jaws aside in a safe place free of mois-
ture and abrasives.
-% Rotate the chuck key clockwise until you see the tip
of the scroll-gear lead thread just begin to enter jaw
guide #1 (see =`^li\(().
.% Insert jaw #1 into jaw guide #1 and hold the jaw
against the scroll-gear.
/% Rotate the chuck key clockwise one turn to engage
the tip of the scroll-gear lead thread into the jaw. To
verify the jaw is engaged with the lead thread, pull
the jaw; it should be locked into the jaw guide.
0. Install the other jaws in the same manner.
—If installed correctly, the three jaws will converge
together at the center of the chuck.
—If the jaws do not come together, repeat this
procedure until they do.
=`^li\0% Chuck and jaw selection.
=`^li\((% Lead thread on scroll gear.
Lead Thread
=`^li\('% Jaw guide number.
Jaw Guide #1
Jaw Numbers
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