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Aligning Tailstock to Spindle
centerline
this is an essential adjustment that should be ver-
ified or performed each time the tailstock is used
to turn concentric workpieces between centers
or immediately after offsetting the tailstock when
turning a taper. if the tailstock is not aligned with
the spindle centerline when it is supposed to be,
turning results will be inaccurate along the length
of the workpiece.
items Needed
hex Wrench 6mm .............................................. 1
round stock 2" x 6" .......................................... 2
precision level .................................................. 1
To align the tailstock to the spindle center-
line:
1.
Use the precision level to make sure the bed-
way is level from side to side and from front
to back.
— if the bedway is not level, correct this
condition before continuing with this proce-
dure (refer to the Leveling section in this
manual).
2.
Center drill both ends of one piece of round
stock, then set it aside for use in Step 5.
3.
Use the other piece of round stock to make
a dead center, and turn it to a 60° point, as
illustrated in the figure below.
figure 51. turning a dead center.
-42-
Note: As long as this dead center remains in
the chuck, the point of the center will remain
true to the spindle centerline. The point will
have to be refinished whenever the center is
removed and then returned to the chuck.
4.
install a center in the tailstock.
5.
attach a lathe dog to the test stock from
Step 2, then mount it between the centers as
shown in the figure below.
Qty
figure 52. Example photo of stock mounted
6.
turn 0.010" off the stock diameter.
7.
Mount a test or dial indicator so that the
plunger is on the tailstock quill.
Note: If necessary in the following step, refer
to the Offsetting Tailstock subsection for
detailed instructions.
Model G0746/G0749 (Mfg. Since 3/13)
between the centers.
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