-13-
g9298/g9299/g9300 rotary table
2. slowly continue to turn the handwheel clock-
wise to 42' as displayed on the handwheel
scale (see the illustration in
figure 9).
0
60
40 30 20 10
0
50
10
20
30
40
5
0
1
42 Arc
Minutes
20 Arc Seconds
Vernier Scale
Handwheel Scale
Degree
figure 9. table set at 16° 42' 20".
3. identify the mark on the vernier scale that is
two marks or 20" to the left of the zero mark.
Note:
When the handwheel is turned clock-
wise, the marks to the left of the zero mark
on the vernier scale are used, and when the
handwheel is turned counterclockwise, the
marks on the right are used.
4. identify the mark on the handwheel scale that
is immediately to the left of the vernier scale
mark identified in
Step 3, then slowly rotate
the handwheel clockwise to align these two
marks. the table is now set 16° 42' 20".
Basic Operation
in the following two exercises, it is assumed that
the following statements are true before beginning
the operation:
•
the rotary table is properly secured to the mill
table in the horizontal position.
•
the rotary table is properly centered with the
mill spindle.
•
the workpiece is centered on the rotary table
and elevated for proper machining clear-
ance.
•
the workpiece is securely clamped to the
rotary table.
five Evenly Spaced Holes
in this exercise, you will make five holes spaced
72° apart in a circular workpiece, as illustrated in
figure 10.
72º
figure 10. Five holes spaced 72° apart.
Tip:
When using the rotary table to machine
several locations or with a complicated pattern,
make a drawing with measurement details to help
visualize the operation. This will reduce the risk of
making errors during the operation.
