Version 1.05 March 2020
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1. To change an Index Gear, first, turn in the Retention Set screw so it does not protrude above Outside
diameter surface of the Quill
(it’s OK – it will not fall into the inside diameter). Then, loosen the set screw in the
hub of the mounted Index Gear and slide the Index Gear being removed forward and off the Quill. Also, remove
the Detent (a gear segment)--it is held by a screw.
2. Now, install the new Detent and tighten the screw. Slide the new Index Gear onto the Quill and snug the set-
screw slightly (so that the Index Gear can still rotate on the Quill). Back out (but do not remove) the Retention
Set Screw (it will be used to retain the Alignment Bar in the next several steps.
Aligning the Index Gear to the Dop Alignment Pin.
1. Place your best flat lap onto the platen.
2. Set the Mast axial angle at about 40
±5
(not at all critical). Engage the Detent with the zero position on the
Index Gear (the Index Gear is still in an able-to-slip mode). Verify that the Index Vernier is set at a 0 position.
3. Insert the Alignment Bar into the Spindle, engaging the rear chamfer with the Alignment Pin, press it in firmly
and lock it in by tightening the Retention Set Screw.
4. Onto the surface of the Lap, set a piece of paper
—about 3 inches square (a piece cut from a shiny page in a
magazine is good to use
—it is very parallel). Set the paper onto the Lap—that is the “landing site” for the
Alignment Bar, in the next step.
5. With the Angle Dial set at the approximate 40°, set the peripheral surface of the Alignment Bar onto the lap
surface (that is, onto the paper)
—press it down so that it is flush to the paper (the Angle Stop does not have to
be engaged). As the pressure is applied to the Bar, the Quill will rotate within the Index Gear (remember, the
Index Gear was set at 0 and still in an able-to-slip mode). Holding the Alignment Bar flush against the paper,
tighten the setscrew on the hub of the Index Gear. Done.
If you are not replacing the Index Gear, but you do want to re-align the keying, set the Index Gear at 0, loosen
the setscrew slightly that holds the Index Gear to the Quill (so that the Index Gear can rotate), and then follow
steps 3-5, above.