Grizzly Horizontal/Vertical Rotary Table G9298 - Manual (Page 16)

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g9298/g9299/g9300 rotary table
To make five evenly spaced holes:
1. use the handwheel to rotate the rotary table
to the zero mark on the table scale, then
tighten both table locks.
Note: Make sure the handwheel and vernier
scales also read zero.
2. drill the first hole.
3. unlock the table, then turn the handwheel 18
full turns which will rotate the rotary table to
72° as displayed on the table scale.
Note: Be careful not to pass the zero mark
on the last turn. If you go past the zero mark,
reverse the handwheel one full turn, then try
again. This will eliminate any backlash error
that occurs when reversing handwheel direc-
tion.
4. lock the table in place and drill the hole.
5. repeat Steps 3–4, which will produce the
third hole at 144°, the fourth hole at 216°, and
the fifth hole at 288°.
Two Circular Slots
in this exercise, you will cut two 90° circular slots
in a round workpiece, as illustrated in
figure 11.
90º
0.25"
1.125"
Start
Here
Radius
figure 11. two 90° circular slots.
To make two circular slots:
1. use the handwheel to rotate the rotary table
to the zero mark on the table scale, then
tighten both table locks.
Note: Make sure the handwheel and vernier
scales also read zero.
2. Move the mill table to the left 1.125" along its
X-axis so that the spindle is above the lower
end of the upper slot.
3. With a 1 ⁄
4
" end mill installed in the mill spindle,
make a 0.083" deep hole (approximately 1 ⁄
3
of
the cutter's diameter).
4. With the end mill continuing to cut, turn the
rotary table handwheel clockwise 15 full
turns, using care not to pass the zero mark
on the last turn.
5. raise the end mill from the workpiece, then
turn the rotary table handwheel counterclock-
wise 16 full turns—one full turn past the start-
ing point to eliminate the backlash error.
6. rotate the rotary table clockwise back to the
0° mark, then take an additional 0.083" deep
cut.
7. repeat Steps 4–6 until the final depth of cut
is reached.
8. raise the end mill from the workpiece, then
return the rotary table back to the 0° mark.
9. Move the mill table 2.25" to the right along its
X-axis to align the cutter with the end of the
second circular slot.
10. repeat Steps 3–7 to complete the second
circular slot.