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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.

Jaw Numbers Jaw Guide #1

=`^li\('% Jaw guide number.

Lead Thread

=`^li\((% Lead thread on scroll gear.

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